Rice oil and preparation method thereof

Abstract

The present invention provides rice bran oil and a preparation method thereof. The wax content of the rice bran oil of the present invention is 0.7-2.5wt%, and the solid fat content at 30°C is 1.9-5.0wt%. The preparation method of the rice bran oil includes degumming, alkali refining deacidification, desoaping, physical deacidification, decolorization and deodorization steps, wherein the acid value of the rice bran used to prepare the rice bran oil is 5-25mg / g, the acid value of the neutralized oil obtained by controlling the alkali refining deacidification is in the range of 5-15mg / g, and the desoaping is dry desoaping. The rice bran oil prepared using the inventive method has gelling properties and can be used as gel oil for flavor sustained release and preventing grease migration, etc.

Description

Technical Field

[0001] The invention relates to rice bran oil and a preparation method thereof. Background Art

[0002] As people's diets change, the proportion of puffed, baked, and spreadable foods is increasing. Studies have shown that excessive intake of trans and saturated fatty acids in the diet can have adverse effects on human health, such as increasing the risk of metabolic syndromes such as diabetes, obesity, and cardiovascular disease.

[0003] Gel oil is a thermoreversible, viscoelastic, liquid or solid lipid mixture composed of a lipophilic liquid (typically a vegetable oil) and a small-molecule organic gelling agent. Gel oil is considered the most promising alternative to traditional fats high in saturated fatty acids and hydrogenated oils high in trans fatty acids, and is used as a base for solid oil products specifically formulated for food.

[0004] Li Sheng et al. ("Research Progress on γ-oryzanol and β-sitosterol Gel Oils," Grain and Oils, Vol. 28, No. 6, 2015, pp. 4-8) revealed that gelling agents are key components of gelling oils, and their structure directly influences their properties. Currently, self-assembly gelling agents have been discovered, including sorbitan monostearate, ceramide, monoglycerides, and phytosterol + oryzanol; crystallization gelling agents include fatty acids, fatty alcohols, phospholipids, waxes, wax esters, fatty acids + fatty alcohols, and lecithin + sorbitan tristearate. The gelling agent currently used in food systems is a mixture of γ-oryzanol and β-sitosterol.

[0005] Cao Ruizhi et al. ("Study on the Effect of Rice Bran Wax on the Gel Properties of Soybean Oil," China Oils and Fats, Vol. 43, No. 5, 2018, pp. 28-32) added rice bran wax to soybean oil to prepare gelled oil. They investigated the effects of rice bran wax addition and cooling temperature on the gelled oil. The results showed that at a 5% rice bran wax addition, the oil remained fluid at room temperature and did not form a gelled oil. At an 8% rice bran wax addition, the oil formed a gelled oil at room temperature with a pleasant mouthfeel and a certain degree of plasticity. With increasing rice bran wax addition, the gelled oil increased in hardness while decreasing in cohesiveness, elasticity, and chewiness, while maintaining essentially unchanged resilience.

[0006] The results of Xiao Zifen et al. ("Effect of the Bond of β-Sitosterol and γ-oryzanol on the Properties of Oils and Fats", Journal of the Chinese Cereals and Oils Association, Vol. 30, No. 8, August 2015) showed that when the mass fraction of saturated fat in oils and fats was 30% to 50%, the hardness provided by the bond of β-sitosterol and γ-oryzanol was equivalent to 2.2 to 2.8 times the hardness provided by tristearin; when palm oil contained 8% of the bond, a small amount of β crystal appeared; atomic force microscopy characterization showed that the crystal morphology of palm oil became more uniform and fine, and the network structure was enhanced.

[0007] Therefore, there is a need in the art for a gel oil that does not contain an exogenous gelling agent. Summary of the Invention

[0008] To address these issues, the present invention utilizes optimized raw materials and refined oil blends to produce a gelled oil, avoiding the high cost, poor taste, and regulatory non-compliance associated with exogenously added gelling agents. The gelled oil produced by this invention plays an important role in areas such as flavor release and preventing oil migration.

[0009] A first aspect of the present invention provides rice bran oil, which has one or more of the following characteristics: based on its total weight, the rice bran oil has a wax content of 0.7-2.5wt%, such as 0.9-2.5wt%, and a solid fat content of 1.9-5.0wt%, such as 2.0-5.0wt% at 30°C; the rice bran oil has a gel strength of 10-200g, such as 10-110g or 100-200g; and the wax in the rice bran oil is wax that has not been completely removed when preparing the rice bran oil using crude rice bran oil.

[0010] A second aspect of the present invention provides a method for preparing rice oil, which includes the steps of degumming, alkali refining and deacidification, desoaping and physical deacidification, wherein the acid value of rice bran used to prepare the rice oil is 5-25 mg / g, the acid value of the neutralized oil obtained by alkali refining and deacidification is controlled to be in the range of 5-15 mg / g, and the desoaping is a dry desoaping method.

[0011] In one or more embodiments, the method further comprises decolorization and deodorization steps.

[0012] In one or more embodiments, oil is extracted from rice bran with an acid value of 5-25 mg / g by leaching to obtain a mixed oil from which part of the solvent has been removed, which is used to prepare the rice oil.

[0013] In one or more embodiments, the oil concentration in the mixed oil is 50-80%, such as 60-70 wt%.

[0014] In one or more embodiments, the oil temperature during the alkali refining and deacidification is controlled at 20-50°C.

[0015] In one or more embodiments, the degumming is performed before alkali refining and deacidification, or after dry desoaping and before physical deacidification.

[0016] In one or more embodiments, the degumming is acid refining degumming, comprising: adding an acid solution to the oil, stirring, solid-liquid separation, and taking the oil phase; preferably, the acid refining degumming temperature is 40-90°C, preferably 50-70°C; preferably, the degumming time is 10-60 min, preferably 15-45 min; preferably, the acid solution is a phosphoric acid solution and / or a citric acid solution.

[0017] In one or more embodiments, the desoaping medium of the dry desoaping is selected from one or more of waste clay, activated clay and diatomaceous earth; preferably, the amount of the desoaping medium is 0.1-5%, such as 0.5-3%, of the weight of the neutralized oil obtained by alkali refining and deacidification, and the desoaping is preferably carried out at a pressure of 2-40 kPa, preferably 2-10 kPa, and a temperature of preferably 80-120°C, such as 80-100°C.

[0018] In one or more embodiments, the physical deacidification reduces the acid value of the oil to less than 3.0 mg / g.

[0019] In one or more embodiments, the decolorization temperature is 100-120°C, preferably 108-110°C.

[0020] In one or more embodiments, in the decolorization step, the amount of decolorizing agent added is 0.5%-5% by weight of the oil, preferably 1%-5%.

[0021] In one or more embodiments, the decolorizing agent is selected from one or more of: fuller's earth, activated clay, activated carbon, zeolite, attapulgite, diatomaceous earth, and silica gel.

[0022] In one or more embodiments, the pressure of decolorization is 1-6 kPa, such as 2-4 kPa.

[0023] In one or more embodiments, the decolorization time is 20-120 min, preferably 30-120 min.

[0024] In one or more embodiments, the deodorization temperature is ≤ 240°C, such as 180-240°C, 200-240°C.

[0025] In one or more embodiments, the deodorization pressure is 1-6 kPa, such as 2-4 kPa.

[0026] In one or more embodiments, the deodorization time is 0.5-3 hours, preferably 1-2 hours.

[0027] A third aspect of the present invention provides a fat composition, wherein the fat composition contains the rice oil described in any embodiment herein or the rice oil prepared by the method described in any embodiment herein.

[0028] In one or more embodiments, the oil composition does not contain exogenous gelling agents.

[0029] In one or more embodiments, the grease composition is a gel oil.

[0030] A fourth aspect of the present invention provides a method for preparing an oil composition, wherein the method comprises: preparing rice oil by the method described in any embodiment herein, and then mixing the rice oil with other oil bases.

[0031] In one or more embodiments, the oil composition further comprises other oil base materials, and the other oil base materials are plant oils and fats.

[0032] In one or more embodiments, the vegetable oil is selected from the group consisting of palm oil, palm kernel oil, rapeseed oil, soybean oil, cottonseed oil, safflower seed oil, perilla seed oil, tea seed oil, palm fruit oil, peanut oil, coconut oil, olive oil, cocoa bean oil, almond oil, apricot kernel oil, rubber seed oil, linseed oil, corn germ oil, wheat germ oil, sesame seed oil, evening primrose seed oil, hazelnut oil, pumpkin seed oil, walnut oil, grape seed oil, flax seed oil, borage seed oil, sea buckthorn seed oil, tomato seed oil, macadamia nut oil, cocoa butter and algae oil.

[0033] A fifth aspect of the present invention provides the use of rice bran with an acid value of 5-25 mg / g in the preparation of rice oil as a gel oil, wherein the preparation includes an alkali refining and deacidification step and a dry desoaping step after the alkali refining and deacidification, wherein the acid value of the neutralized liquid obtained by the alkali refining and deacidification is 5-15 mg / g.

[0034] In one or more embodiments, the preparation further comprises the steps of degumming, physical deacidification, decolorization and deodorization.

[0035] In one or more embodiments, oil is extracted from rice bran with an acid value of 5-25 mg / g by leaching to obtain a mixed oil from which part of the solvent has been removed, which is used to prepare the rice oil.

[0036] In one or more embodiments, the oil concentration in the mixed oil is 50-80%, such as 60-70 wt%.

[0037] In a sixth aspect, the present invention provides the use of the rice oil according to any embodiment of the present invention or the rice oil prepared by the method according to any embodiment of the present invention in flavor sustained release and preventing oil migration.

[0038] A seventh aspect of the present invention provides a method for preparing a food, characterized in that the method comprises the steps of preparing rice bran oil by the method described in any embodiment herein, and preparing the food using the rice bran oil.

[0039] In one or more embodiments, the food product is a confectionery or a baked good.

[0040] In one or more embodiments, the candy comprises chocolate, toffee, marshmallow, or bonbon.

[0041] In one or more embodiments, the baked goods include cookies, bread, cakes, spreads, mayonnaise, fillings, puff pastries, croissants, and puff pastries.

[0042] The eighth aspect of the present invention provides a food obtained by the preparation method described in the seventh aspect, wherein the flavor of the food can be maintained for a long time.

[0043] An eighth aspect of the present invention provides a food, the food is the rice oil described in any embodiment of the present invention or the rice oil prepared by the method for preparing the rice oil according to any embodiment of the present invention.

[0044] In one or more embodiments, the food is a confectionery or baked good.

[0045] In one or more embodiments, the candy comprises chocolate, toffee, marshmallow, or bonbon.

[0046] In one or more embodiments, the baked goods include cookies, bread, cakes, spreads, mayonnaise, fillings, puff pastries, croissants, and puff pastries. DETAILED DESCRIPTION

[0047] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0048] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0049] Throughout this document, all features, such as values, quantities, amounts, and concentrations, specified in numerical ranges or percentage ranges are provided for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to encompass and specifically disclose all possible subranges and individual values within those ranges (including integers and fractions). Unless otherwise specified, percentages herein refer to percentages by mass.

[0050] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0051] Currently, gel oils are prepared by adding exogenous gelling agents. The present invention discovers that by optimizing raw materials and refining a mixed oil with an appropriate acid value, the gel oil can remain in a gel state even when refrigerated at low temperatures, even when the wax content is 0.7-2.5%, preferably 0.9-2.5%. This invention avoids the problems of exogenous gelling agents, such as high cost, poor taste, and regulatory non-compliance. The resulting gel oil has important applications in areas such as flavor sustained release and preventing oil migration.

[0052] The method for preparing rice oil of the present invention may include the steps of degumming, alkali refining and deacidification, dry desoaping and physical deacidification, and may optionally include the steps of decolorization and deodorization.

[0053] One of the characteristics of the present invention is that the raw material for preparing the rice bran oil is rice bran having an acid value of ≤25 mg / g. In some embodiments, the acid value of the rice bran is ≥5 mg / g. The rice bran can be any variety of rice bran well known in the art, as long as its acid value is within the range defined by the present invention.

[0054] Rice oil can be extracted from rice bran having an acid value of ≤25 mg / g using an extraction method. The extraction method can be a conventional extraction method in the art, and the solvent used can be a conventional solvent in the art, such as hexane, petroleum ether, No. 6 solvent, and ethyl acetate. After the oil is extracted by the extraction method, a portion of the solvent is removed to reduce the oil concentration in the raw material to 50-80%, such as 60-70% by weight. The solvent can be removed by conventional evaporation.

[0055] In the present invention, degumming can be performed before alkali refining and deacidification, or after dry desoaping and before physical deacidification. The degumming method can be conventional degumming methods in the art, and the specific process is well known to those skilled in the art. For example, the methods described in Bailey's Oil Chemistry and Technology (Volume 6) can be used, but are not limited to them. Degumming can be performed enzymatically or by acid refining. Enzymatic degumming generally involves adding a degumming enzyme (such as a phospholipase) to the oil, reacting the oil under specific temperature and pH conditions for a period of time, and then separating the gum to obtain degummed oil. The enzymatic degumming temperature can be 40-60°C, preferably 40-50°C; the pH can be 4-6, preferably 4.5-5.5; the reaction time can be 2-6 hours, preferably 3-5 hours; and the enzyme addition level can be 5-1000 mg / kg, preferably 10-100 mg / kg, of the oil weight.

[0056] Acid refining and degumming includes adding an acid solution to the oil, stirring, separating the solid and liquid, and taking the oil phase. The acid refining and degumming temperature can be 40-90°C, preferably 50-70°C; the degumming time can be 10-60 minutes, preferably 15-45 minutes; the acid solution can be a phosphoric acid solution and / or a citric acid solution, for example, a phosphoric acid solution with a concentration of 10-30wt%, preferably 10-15wt%; the amount of the acid solution used depends on the specific acid solution selected, for example, when using a phosphoric acid solution with a concentration of 10-15wt%, the amount used can be 0.1-5%, preferably 1-5% of the mass of the oil; the solid-liquid separation method can be centrifugal separation. The degumming medium can be any conventional degumming medium in the art, such as a citric acid solution and a phosphoric acid solution. Water may be added simultaneously, typically in an amount not less than 0.5% by weight of the oil. The amount of water used in a single degumming step is typically no more than 30% by weight of the oil, for example, within the range of 0.5-20% by weight, 0.5-10% by weight, or 5-5% by weight. This amount of water does not include water in the degumming medium. After the reaction is complete, the degummed oil is obtained by separating the colloid.

[0057] In some embodiments, the present invention uses acid degumming. In some embodiments, the degumming comprises: adding a 10-15 wt% phosphoric acid solution to the oil and fat, which is 1-5% by weight of the oil, and stirring the solution at 40-70° C. for 15-45 minutes.

[0058] The main purpose of deacidification (alkali refining) is to remove free fatty acids from oils and fats, while also removing some impurities such as pigments, phospholipids, hydrocarbons, and mucilage. Deacidification methods can be conventional in the art, including alkali refining deacidification and physical deacidification.

[0059] The process conditions for alkali refining can adopt the process conditions in "Berry's Oil Chemistry and Technology" (Volume 6) and other books. However, in the present invention, the alkali refining temperature (the temperature at which oils and fats react with alkali solution) is controlled below 50°C, such as 20-50°C. Other processes of alkali refining can be conventional processes. For example, the alkali refining reaction time can be 10-120min, preferably 30-120min; the alkali solution is usually a sodium hydroxide solution, and the concentration of the sodium hydroxide solution can be 10-20wt%, preferably 3-15wt%; the amount of alkali added can be conventional in the art, for example, 0.5-15% or 1-10% of the weight of the oil. It can be understood by those skilled in the art that the alkali added during alkali refining is divided into two parts: theoretical alkali and excess alkali. Generally, the amount of alkali added = 7.13×10 -4 = × M oil × AV × (1 + excess alkali), where the excess alkali can be 0-20%. The amount of alkali liquor = the amount of alkali added / the concentration of the alkali liquor, where M oil refers to the weight of the oil and AV refers to the acid value. After the reaction of the alkali liquor and the oil is completed, centrifugation is performed to obtain the neutralized oil. It should be understood that if the degummed oil contains the solvent used in the extraction process, the solvent can be removed after the alkali refining is completed, for example by evaporation. One of the characteristics of the present invention is that the acid value of the deacidified oil obtained by alkali refining is controlled within the range of 5-15 mg / g. Therefore, there are no specific restrictions on the selection of the alkali liquor concentration, amount, and alkali refining time, as long as the acid value of the resulting alkali-refined deacidified oil is controlled within the above range.

[0060] After alkali refining and deacidification, soap removal is usually carried out. One of the characteristics of the present invention is that dry desoaping is adopted. Specifically, a non-aqueous soap removal medium is used for soap removal. The non-aqueous soap removal medium can be various media conventionally used for anhydrous soap removal in the art, including waste clay, diatomaceous earth, etc. An appropriate amount of soap removal medium can be added to the alkali-refined deacidified oil, such as 0.1-5%, such as 0.5-3% of the soap removal medium by weight of the alkali-refined deacidified oil, and soap removal is carried out at a pressure of 2-40kPa, preferably 2-10kPa, and a temperature of 80-120°C, preferably 80-100°C. The soap removal time can be selected according to actual conditions, for example, it can be 10-180 minutes.

[0061] The purpose of physical deacidification is to reduce the acid value of oils and fats to below the national standard (rice bran oil acid value ≤ 3.0 mg / g). Therefore, physical deacidification methods well known in the art can be used. Exemplary physical deacidification processes include: a pressure of 1-5 kPa, preferably 1-3 kPa, and a temperature of 200-260°C, preferably 220-250°C. Physical deacidification can be performed in a deacidification tower. The deacidification time can be selected based on actual conditions, typically within the range of 1-3 hours.

[0062] Herein, the decolorization method may be conventional in the art, and the specific process is well known to those skilled in the art. For example, the method described in Bailey's Oil Chemistry and Technology (Volume 6) may be employed, but is not limited thereto. Generally, decolorization involves adding an appropriate amount of a decolorizing agent to the oil, reacting the oil under a specific temperature and vacuum conditions, and then filtering the oil after the reaction. Specifically, the decolorization temperature may be 100-120°C, preferably 108-110°C; the amount of the decolorizing agent added may be 0.5%-5% of the oil's mass, preferably 1%-5%. The decolorizing agent may be any of a variety of agents well known in the art, including but not limited to fuller's earth, activated clay, activated carbon, zeolite, attapulgite, diatomaceous earth, and silica gel. The decolorization pressure may be controlled at 1-6 kPa, such as 2-4 kPa. The decolorization time may be 20-120 minutes, preferably 30-120 minutes.

[0063] The deodorization process of the present invention can be carried out under conventional deodorization conditions in the art, preferably at a deodorization temperature ≤ 240°C, such as within the range of 180-240°C or 200-240°C. The specific deodorization process is well known to those skilled in the art, and for example, methods described in, but not limited to, Bailey's Oil Chemistry and Technology (Volume 6) can be employed. For example, deodorization can include introducing nitrogen or water vapor into the oil as a deodorizing medium, and allowing the oil to contact the nitrogen or water vapor for a period of time under certain temperature and vacuum conditions. Deodorization can also be performed using a falling film evaporator. The deodorization pressure can be controlled within a range of 1-6 kPa, such as 2-4 kPa. The deodorization time can be 0.5-3 hours, preferably 1-2 hours.

[0064] In some embodiments, the present invention provides a rice bran oil prepared by the method described in any embodiment of the present invention. Preferably, the rice bran oil has one or more of the following characteristics:

[0065] (1) Wax content 0.7-2.5%, preferably 0.9-2.5%;

[0066] (2) Solid fat content at 30°C: 1.9-5wt%;

[0067] (3) The gel strength is 10-200 g, such as 10-110 g or 100-200 g.

[0068] The rice oil of the present invention can be used as a gel oil. Therefore, in some embodiments, the present invention provides a rice oil-based gel oil comprising the rice oil described in any embodiment herein and without an exogenous gelling agent. It should be understood that the exogenous gelling agent described herein refers to a substance other than the components naturally present in the rice oil that acts as a gelling agent. The rice oil or gel oil of the present invention can provide a flavor slow release and prevent oil migration. Therefore, in some embodiments, the present invention provides the use of the rice oil or gel oil of the present invention for flavor slow release and preventing oil migration.

[0069] In some embodiments, the present invention provides a grease composition comprising the rice oil described herein; preferably, the grease composition does not contain an exogenous gelling agent. The grease composition can be used as a gelled oil. In addition to the rice oil, the grease composition may also contain other plant oils other than rice oil, including but not limited to palm oil, rice oil (rice oil from other sources different from the rice oil of the present invention), palm kernel oil, rapeseed oil, soybean oil, cottonseed oil, safflower seed oil, perilla seed oil, tea seed oil, palm fruit oil, peanut oil, coconut oil, olive oil, cocoa bean oil, almond oil, apricot kernel oil, rubber seed oil, linseed oil, corn germ oil, wheat germ oil, sesame seed oil, evening primrose seed oil, hazelnut oil, pumpkin seed oil, walnut oil, grape seed oil, flax seed oil, borage seed oil, sea buckthorn seed oil, tomato seed oil, macadamia nut oil, cocoa butter, and algae oil, or a mixture thereof.

[0070] In some embodiments, the present invention provides a food comprising the rice bran oil described in any embodiment herein. In some embodiments, the food is a candy or a baked good. Preferably, the candy includes chocolate, toffee, marshmallow, or bonbons. Preferably, the baked good includes biscuits, bread, cakes, spreads, mayonnaise, fillings, pastries, croissants, and puff pastries.

[0071] In some embodiments, the present invention provides the use of rice bran with an acid value of 5-25 mg / g in the preparation of rice oil as a gel oil. Preferably, the preparation includes the alkali refining and deacidification step and the dry desoaping step described in any embodiment herein. Preferably, the preparation also includes the degumming, deacidification, physical deacidification and deodorization steps described in any embodiment herein. Preferably, in the application, the oil is extracted from the rice bran with an acid value of 5-25 mg / g by leaching to obtain a mixed oil from which part of the solvent has been removed, which is used to prepare the rice oil; preferably, the concentration of oil in the mixed oil is 50-80%, such as 60-70wt%.

[0072] It should be understood that the following examples are further illustrative of the present invention, but the present invention is not limited by the following contents. The embodiments in the present specification are only used to illustrate the present invention and do not limit the scope of protection of the present invention. The scope of protection of the present invention is limited only by the claims, and any omissions, substitutions, or modifications made by those skilled in the art based on the embodiments disclosed in the present invention will fall within the scope of protection of the present invention.

[0073] The preparation process of the rice oil-based gel oil in the examples and comparative examples and the test methods for various indicators in the finished products are as follows, and the final results are shown in Table 1:

[0074] (1) Acid value: Refer to GB5009.229 2016-2016 for testing.

[0075] (2) Wax content: Detected by acetone insoluble matter method.

[0076] (3) Determination of solid fat content (SFC): A certain amount of oil gel sample was added to the glass tube of pulsed nuclear magnetic resonance, so that the sample height was (4±1) cm. It was kept at 90℃ for 20 min to eliminate the crystallization memory, and then kept at 0℃ for 90 min. Its SFC was measured again. Then the temperature was increased from 0℃ to 70℃, increasing by 5℃ each time, and kept for 30 min. The SFC at each temperature was measured.

[0077] (4) Texture (strength) determination:

[0078] The brand of the texture analyzer is TA.XPLus, and the manufacturer is SMS Company of the UK.

[0079] Place an appropriate amount of gel oil sample in a 10 mL beaker, maintaining uniformity and measuring surface smoothness. Texture analyzer measurement conditions: needle P 0.5, pre-measurement speed 0.5 mm / s, mid-measurement speed 0.5 mm / s, post-measurement speed 0.5 mm / s, and a penetration depth of 15 mm. Each sample was measured three times at 25°C, and the average value was calculated.

[0080] Example 1

[0081] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0082] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0083] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0084] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0085] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0086] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0087] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0088] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0089] Example 2

[0090] (1) Preparation of mixed oil: Rice bran with an acid value of 20 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0091] Step (2) is the same as step (2) in Example 1.

[0092] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) is added at a concentration of 7% by weight of the oil. The reaction is continued for 1 hour and centrifuged. The acid value after alkali refining is controlled to 15 mg / g. The solvent is evaporated and removed to obtain the crude oil.

[0093] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0094] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0095] Example 3

[0096] (1) Preparation of mixed oil: Rice bran with an acid value of 18 mg / g was selected and extracted with petroleum ether to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0097] Step (2) is the same as step (2) in Example 1.

[0098] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 50°C, and a sodium hydroxide aqueous solution (concentration 10%) of 6% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 10 mg / g, and the solvent is evaporated to obtain the crude oil.

[0099] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0100] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 10℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0101] Example 4

[0102] (1) Preparation of mixed oil: Rice bran with an acid value of 13 mg / g was selected and extracted with ethyl acetate to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0103] Step (2) is the same as step (2) in Example 1.

[0104] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a 10% sodium hydroxide aqueous solution (5% by weight of the oil) is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0105] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0106] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 15℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0107] Example 5

[0108] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 50%.

[0109] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0110] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0111] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0112] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0113] Example 6

[0114] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 80%.

[0115] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0116] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0117] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0118] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0119] Example 7

[0120] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0121] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0122] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at 50°C, and a sodium hydroxide aqueous solution (10% concentration) of 8% by weight of the oil is added and the reaction is continued for 10 minutes. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0123] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0124] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0125] Example 8

[0126] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0127] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0128] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 35°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 180 minutes. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0129] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0130] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0131] Example 9

[0132] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0133] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0134] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (30% concentration) with a concentration of 2.7% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0135] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0136] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0137] Example 10

[0138] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 70%.

[0139] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0140] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a 5% sodium hydroxide aqueous solution (16% by weight of the oil) is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0141] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0142] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0143] Example 11

[0144] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0145] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0146] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0147] (4) Dry desoaping: Add 1% activated clay to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0148] Steps (5) to (7) are the same as steps (5) to (7) in Example 1.

[0149] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0150] Comparative Example 1

[0151] (1) Preparation of mixed oil: Rice bran with an acid value of 30 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 70%.

[0152] Step (2) is the same as step (2) in Example 1.

[0153] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 30°C, and a sodium hydroxide aqueous solution (concentration 10%) with a concentration of 13% of the oil weight is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 10 mg / g, and the solvent is evaporated to obtain the crude oil.

[0154] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0155] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0156] Comparative Example 2

[0157] (1) Preparation of mixed oil: Rice bran with an acid value of 20 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 70%.

[0158] Step (2) is the same as step (2) in Example 1.

[0159] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 30°C, and a sodium hydroxide aqueous solution (concentration 10%) with a concentration of 12% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 2 mg / g, and the solvent is evaporated to obtain the crude oil.

[0160] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0161] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0162] Comparative Example 3

[0163] (1) Preparation of mixed oil: Rice bran with an acid value of 20 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 70%.

[0164] Step (2) is the same as step (2) in Example 1.

[0165] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 30°C, and a sodium hydroxide aqueous solution (10% concentration) of 2% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 17 mg / g, and the solvent is evaporated to obtain the crude oil.

[0166] Steps (4) to (7) are the same as steps (4) to (7) in Example 1.

[0167] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0168] Comparative Example 4

[0169] (1) Preparation of mixed oil: Rice bran with an acid value of 20 mg / g was selected and extracted with petroleum ether to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0170] Step (2) is the same as step (2) in Example 1.

[0171] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 30°C, and a sodium hydroxide aqueous solution (concentration 10%) is added at a concentration of 7% by weight of the oil. The mixture is allowed to react for 1 hour and then centrifuged. The acid value after alkali refining is controlled to be 10 mg / g. The solvent is then evaporated to obtain the crude oil.

[0172] (4) Wet desoaping: The crude oil obtained in the previous step was added with 3% soft water by weight, washed at 80°C for 15 min, and then centrifuged. The oil was then heated to 105°C and dried under a vacuum of 4 kPa to obtain the desoaped oil.

[0173] Steps (5) to (7) are the same as steps (5) to (7) in Example 1.

[0174] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0175] Comparative Example 5 (Reference: "Refining high free fatty acid rice bran oil into edible oil using mixed oil refining method", He Xiaocheng, Grain and Oils. 1988, (01))

[0176] (1) Preparation of mixed oil: Rice bran with an acid value of 20 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 70%.

[0177] Step (2) is the same as step (2) in Example 1.

[0178] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 30°C, and a sodium hydroxide aqueous solution (concentration 10%) is added at a concentration of 7% by weight of the oil. The mixture is allowed to react for 1 hour and then centrifuged. The acid value after alkali refining is controlled to be 10 mg / g. The solvent is then evaporated to obtain the crude oil.

[0179] Step (4) is the same as step (4) in Example 1.

[0180] (5) Second alkali refining and deacidification: The desoaped oil was temperature-controlled to 80°C, and a sodium hydroxide aqueous solution (concentration 10%) with a concentration of 6% by weight of the oil was added and the reaction was continued for 1 hour. The deacidified oil was obtained after centrifugal washing and drying. The acid value of the deacidified oil was controlled to be 1 mg / g.

[0181] Steps (6) to (7) are the same as steps (6) to (7) in Example 1.

[0182] (8) Cold storage molding: Cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours, and then take it out to obtain the finished oil.

[0183] Comparative Example 6 (Reference: "Study on the Refining of Rice Bran Mixed Oil and Production Technology of Nutritional Rice Bran Oil", Chen Yuanshun, Master's thesis of Henan University of Technology)

[0184] (1) Preparation of mixed oil: Rice bran with an acid value of 30 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 70%.

[0185] Step (2) is the same as step (2) in Example 1.

[0186] (3) Alkali refining and deacidification: Add 20% of the oil weight of sodium hydroxide aqueous solution (concentration 10%) and continue to react at 50℃ for 1 hour. Control the acid value after alkali refining to be 1 mg / g. Centrifuge and evaporate to remove the solvent to obtain crude oil.

[0187] Steps (4) to (5) are the same as steps (6) to (7) in Example 1.

[0188] (6) Cold storage molding: cool the deodorized oil to 25℃, place it in a 4℃ environment for 24 hours and then take it out to obtain the finished oil.

[0189] Comparative Example 7

[0190] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with petroleum ether to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 30%.

[0191] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0192] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0193] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0194] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0195] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0196] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0197] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0198] Comparative Example 8

[0199] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with ethyl acetate to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 90%.

[0200] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0201] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0202] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0203] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0204] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0205] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0206] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0207] Comparative Example 9

[0208] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with solvent No. 6 to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil, and the concentration of the mixed oil was controlled to 90%.

[0209] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0210] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 15°C, and a sodium hydroxide aqueous solution (concentration 10%) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0211] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0212] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0213] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0214] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0215] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0216] Comparative Example 10

[0217] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to control the concentration of the mixed oil to 90%.

[0218] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0219] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at 60°C, and a sodium hydroxide aqueous solution (10% concentration) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is controlled to 5 mg / g, and the solvent is evaporated to obtain the crude oil.

[0220] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0221] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0222] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0223] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0224] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0225] Comparative Example 11

[0226] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0227] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0228] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (concentration 10%) of 6% by weight of the oil is added and the reaction is continued for 3 hours. The mixture is then centrifuged. The acid value after alkali refining is controlled to be 16 mg / g, and the solvent is evaporated to obtain the crude oil.

[0229] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0230] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0231] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0232] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0233] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0234] Comparative Example 12

[0235] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0236] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0237] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (3% concentration) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is 20 mg / g. The solvent is removed by evaporation to obtain the crude oil.

[0238] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0239] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0240] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0241] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0242] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0243] Comparative Example 13

[0244] (1) Preparation of mixed oil: Rice bran with an acid value of 25 mg / g was selected and extracted with n-hexane to obtain a mixed oil. Part of the solvent was evaporated to remove the mixed oil concentration to control it to 70%.

[0245] (2) Degumming: Add 3% phosphoric acid aqueous solution (concentration 10%) by weight of the mixed oil and react at 50°C for 30 minutes.

[0246] (3) First low-temperature alkali refining and deacidification: The mixed oil is kept at a temperature of 20°C, and a sodium hydroxide aqueous solution (40% concentration) of 8% by weight of the oil is added and the reaction is continued for 1 hour. The mixture is then centrifuged. The acid value after alkali refining is 0.02 mg / g. The solvent is removed by evaporation to obtain the crude oil.

[0247] (4) Dry desoaping: Add 1% by weight of diatomaceous earth to the crude oil obtained in the previous step, react at a reaction pressure of 4 kPa and 90°C for 30 min, and then filter to obtain desoaped oil.

[0248] (5) Second high-temperature physical deacidification: The desoaped oil obtained in the previous step is pumped into the deacidification tower, the pressure is controlled at 2 kPa, the temperature is 240 ° C, and the deacidified oil is obtained after the reaction for 2 h.

[0249] (6) Decolorization: The deacidified oil obtained in the previous step was added with 3% by weight of white clay, and the reaction was carried out at a reaction pressure of 4 kPa and 115°C for 30 minutes to obtain a decolorized oil.

[0250] (7) Deodorization: The decolorized oil obtained in the previous step was pumped into the deodorization tower, the pressure was controlled to 2 kPa, the temperature was controlled to 230 ° C, and the deodorized oil was obtained after the reaction for 2 h.

[0251] (8) Cold storage molding: Cool the deodorized oil to 25°C and stabilize it for 24 hours to obtain gel oil.

[0252] The rice oil-based gel oils obtained in all examples and comparative examples were tested for wax content, solid fat content, and gel strength using the methods described above. A flavor decay test was also conducted: vanillin was added to the oil of the present invention to prepare a flavor oil with a concentration of 10 ppm. The product was stored at room temperature (25°C) with the lid open. A control sample was stored in a sealed freezer at -20°C. A batch of samples was removed daily for delta-angle testing. The time it took for the flavor of the samples of the present invention and the control sample to show noticeable flavor decay was recorded.

[0253] The results are shown in Table 1 below.

[0254] Table 1

[0255] Form (25℃) Wax content (%) Solid fat content (30℃,%) Gel strength (g) The flavor will obviously decay within 60 days Comparative Example 1 liquid 0.61 1.5 0.17 Day 14 Comparative Example 2 liquid 0.13 0.2 0.15 Day 13 Comparative Example 3 liquid 2.61 1.8 0.20 Day 13 Comparative Example 4 liquid 0.65 1.3 0.13 Day 14 Comparative Example 5 liquid 0.68 0.8 0.15 Day 15 Comparative Example 6 liquid 0.56 0.5 0.16 Day 14 Comparative Example 7 liquid 0.55 1.0 0.15 Day 12 Comparative Example 8 liquid 0.15 0.2 0.14 Day 12 Comparative Example 9 liquid 0.65 1.0 0.14 Day 13 Comparative Example 10 liquid 2.6 1.8 0.14 Day 13 Comparative Example 11 liquid 1.0 1.8 0.15 Day 12 Comparative Example 12 liquid 1.5 1.2 0.10 Day 12 Comparative Example 13 liquid 0.10 0.2 0.08 Day 10 Example 1 Gel state 1.0 2.0 10 Day 53 Example 2 Gel state 1.2 2.8 112 Day 58 Example 3 Gel state 2.5 5.0 200 No obvious attenuation Example 4 Gel state 2.1 4.2 18 Day 55 Example 5 Gel state 1.1 2.2 15 Day 53 Example 6 Gel state 0.9 1.9 9 Day 52 Example 7 Gel state 1.1 2.6 105 Day 57 Example 8 Gel state 1.3 2.4 15 Day 53 Example 9 Gel state 1.1 2.1 10 Day 53 Example 10 Gel state 1.1 2.1 10 Day 53 Example 11 Gel state 1.0 2.0 10 Day 53

[0256] The rice oil prepared using the method of the present invention exhibits good gelling properties without the addition of an exogenous gelling agent, making it suitable for use as a gelled oil. Furthermore, the rice oil prepared using the method of the present invention performs well in flavor decay experiments, making it suitable for flavor release and preventing oil migration.

[0257] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A rice oil-based gel oil, characterized in that The method for preparing the rice oil-based gel oil comprises the steps of degumming, alkali refining and deacidification, desoaping, and physical deacidification. Oil is extracted from rice bran with an acid value of 13-25 mg / g by a leaching method to obtain a mixed oil from which some solvents have been removed. The mixed oil is used to prepare the rice oil-based gel oil. The oil concentration in the mixed oil is 50-80%. The acid value of the neutralized oil obtained by alkali refining and deacidification is controlled to be within the range of 5-15 mg / g, and the desoaping is performed by a dry method. Wherein, the rice oil-based gel oil has the following characteristics: Based on its total weight, the rice oil-based gel oil has a wax content of 0.9-2.5 wt % and a solid fat content of 1.9-5.0 wt % at 30° C.; The rice oil-based gel oil has a gel strength of 10-200 g; The wax in the rice oil-based gel oil is the wax that is not completely removed when crude rice oil is used to prepare the rice oil-based gel oil.

2. The rice oil-based gel oil according to claim 1, wherein The solid fat content at 30°C is 2.0-5.0wt%.

3. The rice oil-based gel oil according to claim 1, wherein The rice oil-based gel oil has a gel strength of 10-110 g.

4. A method for preparing rice oil-based gel oil, comprising the steps of degumming, alkali refining and deacidification, desoaping and physical deacidification, characterized in that: Oil is extracted from rice bran with an acid value of 13-25 mg / g by a leaching method to obtain a mixed oil from which some solvents have been removed, and the mixed oil is used to prepare the rice oil-based gel oil. The oil concentration in the mixed oil is 50-80%. The acid value of the neutralized oil obtained by alkali refining and deacidification is controlled to be within the range of 5-15 mg / g, and the desoaping is performed by a dry method. The rice oil-based gel oil has the following characteristics: based on its total weight, the wax content of the rice oil-based gel oil is 0.9-2.5wt%, and the solid fat content at 30°C is 1.9-5.0wt%; the gel strength of the rice oil-based gel oil is 10-200g; the wax in the rice oil-based gel oil is the wax that is not completely removed when preparing the rice oil-based gel oil using crude rice oil.

5. The method according to claim 4, wherein The method also includes decolorization and deodorization steps.

6. The method according to claim 4, wherein In the mixed oil, the oil concentration is 60-70 wt%.

7. The method according to any one of claims 4 to 6, wherein: The method has the following characteristics: The oil temperature during alkali refining and deacidification is controlled at 20-50°C; The degumming is carried out before alkali refining and deacidification, or after dry desoaping and before physical deacidification; The degumming is acid refining degumming, which includes: adding acid solution to oil, stirring, solid-liquid separation, and taking oil phase; The desoaping medium of the dry desoaping method is selected from one or more of waste clay, activated clay and diatomaceous earth; The physical deacidification reduces the acid value of the oil to below 3.0 mg / g; The decolorization temperature of the decolorization is 100-120°C; The deodorization temperature is ≤240°C.

8. The method according to claim 7, wherein The acid refining and degumming temperature is 40-90°C.

9. The method according to claim 7, wherein The acid refining and degumming temperature is 50-70°C.

10. The method according to claim 7, wherein: The degumming time is 10-60 minutes.

11. The method according to claim 7, wherein The degumming time is 15-45 minutes.

12. The method according to claim 7, wherein The acid solution is a phosphoric acid solution and / or a citric acid solution.

13. The method according to claim 7, wherein The dosage of the desoaping medium is 0.1-5% of the weight of the neutralized oil obtained by alkali refining and deacidification.

14. The method according to claim 7, wherein The dosage of the desoaping medium is 0.5-3% of the weight of the neutralized oil obtained by alkali refining and deacidification.

15. The method according to claim 7, wherein Desoaping is carried out at a pressure of 2-40 kPa.

16. The method according to claim 15, wherein Desoaping is carried out at a pressure of 2-40 kPa and a temperature of 80-120°C.

17. The method according to claim 15, wherein The pressure is 2-10 kPa.

18. The method according to claim 16, wherein The temperature is 80-100°C.

19. The method according to claim 7, wherein The decolorization temperature is 108-110°C.

20. The method according to claim 7, wherein The amount of the decolorizing agent added is 0.5%-5% of the mass of the oil.

21. The method according to claim 7, wherein The amount of the decolorizing agent added is 1%-5% of the mass of the oil.

22. The method according to claim 7, wherein The decolorizing agent is selected from one or more of activated clay, activated carbon, zeolite, attapulgite, diatomaceous earth and silica gel.

23. The method according to claim 7, wherein The decolorization pressure is 1-6 kPa.

24. The method according to claim 7, wherein The decolorization pressure is 2-4 kPa.

25. The method of claim 7, wherein: The decolorization time is 20-120 min.

26. The method of claim 7, wherein: The decolorization time is 30-120 min.

27. The method according to claim 7, wherein The deodorization temperature is 180-240°C.

28. The method of claim 7, wherein: The deodorization temperature is 200-240°C.

29. The method of claim 7, wherein: The deodorization pressure is 1-6 kPa.

30. The method of claim 7, wherein The deodorization pressure is 2-4 kPa.

31. The method of claim 7, wherein: The deodorization time is 0.5-3h.

32. The method of claim 7, wherein: The deodorization time is 1-2 hours.

33. A grease composition, characterized in that The grease composition contains: (1) The rice oil-based gel oil according to any one of claims 1 to 3; or (2) Rice oil-based gel oil prepared by the method according to any one of claims 4 to 32.

34. The grease composition according to claim 33, wherein The oil and fat composition does not contain exogenous gelling agents.

35. The grease composition according to claim 33, wherein The grease composition is gel oil.

36. A method for preparing a grease composition, characterized in that: The method comprises: preparing rice oil-based gel oil by the method according to any one of claims 4 to 32, and then mixing the rice oil-based gel oil with other oil-based materials.

37. The method of claim 36, wherein: The other oil base material is a vegetable oil, which is selected from the group consisting of palm fruit oil, palm kernel oil, rapeseed oil, soybean oil, cottonseed oil, safflower seed oil, perilla seed oil, tea seed oil, peanut oil, coconut oil, olive oil, almond oil, apricot kernel oil, rubber seed oil, linseed oil, corn germ oil, wheat germ oil, sesame seed oil, evening primrose seed oil, hazelnut oil, pumpkin seed oil, walnut oil, grape seed oil, borage seed oil, sea buckthorn seed oil, tomato seed oil, macadamia nut oil, cocoa butter and algae oil.

38. Use of rice bran having an acid value of 13-25 mg / g in preparing rice oil as gel oil, characterized in that: The gel oil is the rice oil-based gel oil according to any one of claims 1 to 3 or the rice oil-based gel oil prepared by the method according to any one of claims 4 to 32, wherein the preparation comprises an alkali refining and deacidification step and a dry desoaping step after the alkali refining and deacidification, wherein the acid value of the neutralized solution obtained by the alkali refining and deacidification is 5-15 mg / g.

39. Use of the rice oil-based gel oil according to any one of claims 1 to 3 or the rice oil-based gel oil prepared by the method according to any one of claims 4 to 32 in flavor sustained release and preventing oil migration.

40. A method for preparing food, characterized in that: The method comprises the steps of preparing rice oil-based gel oil by the method according to any one of claims 4 to 32, and preparing the food using the rice oil-based gel oil.

41. The method of claim 40, wherein: The food is candy, stuffing, spreadable food or baked food.

42. The method of claim 41, wherein The candies include chocolate, marshmallows, and bonbons.

43. The method of claim 42, wherein: The confectionery includes toffee.

44. The method of claim 41, wherein The baked food includes biscuits, bread, cakes, and crispy pastries.

45. The method of claim 40, wherein The food products include mayonnaise, croissants and puff pastry.

46. Food obtained by the preparation method according to any one of claims 40 to 45.