Camellia diester oil suitable for high-temperature cooking mode and beneficial to dissolution of grease nutrients

Abstract

The invention discloses camellia diester oil suitable for high-temperature cooking and facilitating dissolution of grease nutrients. The camellia seed oil composition comprises the following raw materials in parts by weight: 63-67 parts of camellia seed oil, 27-33 parts of medium chain diglyceride, 1.5-2.5 parts of ascorbyl palmitate and 3-4 parts of soybean protein isolate. Camellia seed oil is subjected to screening and impurity removal, crushing with a specific particle size, squeezing at the pressure of 13-17 MPa and the temperature of 55-65 DEG C, and refining with a specific process. The medium-chain diglyceride is generated by specific enzymolysis reaction of coconut oil. The preparation method comprises the following steps: stirring and mixing the camellia-seed oil and the medium-chain diglyceride at 80 DEG C, adding other components, stirring and dissolving, and removing impurities through a three-stage filtering system to obtain a finished product. The oil is multi-element and synergistic in nutrition, has the effects of lowering cholesterol, rapidly supplying energy and the like, is good in stability, can reduce oil smoke and harmful substance residues and promote nutrient dissolution through high-temperature cooking, is accurate in preparation process, is high in product purity, excellent in quality and long in shelf life due to a filtering system, and is suitable for industrial production and consumption of consumers.

Description

Technical Field

[0001] The invention relates to the technical field of camellia diester oil, and specifically designs a camellia diester oil which is suitable for high-temperature cooking and is conducive to the dissolution of oil nutrients. Background Art

[0002] In the field of edible oil, as people pay more attention to healthy eating, the demand for oils that are both nutritious and suitable for specific cooking methods is increasing. However, existing edible oils have shortcomings in many aspects.

[0003] In terms of nutrition, traditional edible oils often have relatively simple nutritional components. For example, ordinary vegetable oils mainly provide unsaturated fatty acids, but lack other important nutrients such as high-quality protein. However, the synergy between nutrients in some oils and fats with added nutrients is not ideal, and it is impossible to achieve the effect of comprehensive and balanced nutrition. In addition, during processing and storage, due to the lack of effective antioxidant measures, the nutrients in oils and fats are easily damaged by oxidation, resulting in poor nutritional stability, making it difficult for consumers to fully obtain the benefits of various nutrients from edible oils.

[0004] In terms of high-temperature cooking performance, many common cooking oils have the problem of insufficient stability when cooking at high temperatures. When the oil temperature rises to a certain level, the oil is prone to oxidation and decomposition, which not only produces a lot of oil smoke, affecting the kitchen environment and human health, but also destroys the nutrients in the oil and generates harmful substances, such as acrolein, which will remain in the cooked food and pose a potential threat to human health. In addition, ordinary oils do not dissolve nutrients well at high temperatures, making it difficult for food to fully absorb the beneficial nutrients in the oil, thus limiting the improvement of the nutritional value of cooked food.

[0005] In terms of preparation technology, in the prior art, the preparation technology of camellia seed oil is not sophisticated enough. The screening of camellia seeds is not strict enough, resulting in impurities and defective fruits being mixed into the raw materials, affecting the quality of the oil. During the pressing process, the control of parameters such as pressure and temperature is not precise enough, which makes the oil yield unstable and easily causes the loss of nutrients. There are also deficiencies in the refining link. The process parameters of degumming, deodorization, decolorization, deacidification and dewaxing are not optimized enough, resulting in incomplete removal of impurities in the oil, difficulty in completely eliminating odors, unclear color, and poor purity and quality stability.

[0006] For the synthesis of medium-chain diglycerides, the enzymatic reaction conditions are not precisely controlled, and parameters such as lipase activity, pH value of the reaction system, and stirring speed fail to reach the optimal range, resulting in unstable production and quality of medium-chain diglycerides. When mixing medium-chain diglycerides with other ingredients, there is a lack of scientific and reasonable mixing process, and it is difficult to mix the ingredients evenly, which is prone to stratification and precipitation, affecting the stability of the oil system and is not conducive to industrial production and quality control.

[0007] In terms of filtration systems, existing oil filtration technology is relatively simple, and most of them only use a single filter or simple filtering equipment for filtration, which cannot effectively remove impurities of different particle size ranges. Although large particles of impurities can be initially filtered out, the removal effect of tiny impurities, colloid particles, microorganisms, etc. is poor, resulting in a high impurity content in the oil and insufficient purity, which affects the quality and shelf life of the oil, and cannot provide consumers with sufficiently pure and safe edible oil. Summary of the invention

[0008] The purpose of the present invention is to provide a method to solve the problems raised in the above background technology.

[0009] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: Camellia diester oil suitable for high temperature cooking and conducive to the dissolution of oil nutrients is composed of the following raw materials in parts by weight: 63-67 parts of camellia seed oil, 27-33 parts of medium chain diglycerides, 1.5-2.5 parts of ascorbyl palmitate, and 3-4 parts of soy protein isolate;

[0010] The camellia seed oil is prepared by the following process: firstly, the camellia seeds are screened to remove impurities and defective fruits, and then crushed into uniform particles with a particle size of 3-4 mm, and then the oil is extracted by squeezing under the conditions of a pressure of 13-17 MPa and a pressing temperature of 55-65° C., and then the obtained crude oil is subjected to the following refining steps in sequence: phosphoric acid with a concentration of 85% is used as a degumming agent, and the addition amount thereof is 0.15-0.25% of the weight of the crude oil for degumming treatment; deodorization treatment is carried out under the conditions of a vacuum degree of 3-5 mmHg, a deodorization temperature of 190-210° C., and a deodorization time of 1.5-2.5 hours; activated white clay is used as a decoloring agent, and the addition amount thereof is 3.5-4.5% of the weight of the crude oil for decolorization treatment; deacidification treatment is carried out by alkali refining method, and the concentration of alkali solution is 12-14%; and dewaxing treatment is carried out after crystallization at 6-8° C. for 9-11 hours, thereby obtaining the camellia seed oil.

[0011] As a preferred embodiment, the medium-chain diglyceride is a diglyceride produced by enzymatic hydrolysis of coconut oil by lipase with an enzyme activity of 5000-8000 U / g.

[0012] As a preferred embodiment, in the enzymatic hydrolysis reaction of the medium-chain diglyceride, the pH value of the reaction system is controlled at 6.5-7.5, and stirring is continued during the reaction at a speed of 100-200 rpm.

[0013] As a preferred embodiment, the purity of the ascorbyl palmitate is not less than 95%.

[0014] A method for preparing the camellia diester oil comprises the following steps: firstly stirring and mixing camellia seed oil and medium-chain diglyceride at 80°C at a speed of 400-450 rpm for half an hour, using double-layer turbine blades as stirring blades, then slowly adding ascorbyl palmitate and soy protein isolate, and stirring until they are completely dissolved, and then filtering the mixed solution through a filtering device to remove solid impurities, thereby obtaining a finished camellia diester oil.

[0015] As a preferred solution, the filtering device adopts a three-stage filtering system, first filtering once with a filter screen with a pore size of 1 μm at a flow rate of 1.2-1.8 cubic meters per hour, and the filter screen is made of a composite material of stainless steel and polypropylene, and then filtering twice with a filter screen with a pore size of 0.45 μm at a flow rate of 0.6-0.9 cubic meters per hour, and the surface of the filter screen has a nano-scale hydrophilic coating, and finally filtering three times with a filter screen with a pore size of 0.22 μm at a flow rate of 0.3-0.4 cubic meters per hour.

[0016] As a preferred solution, the camellia seed oil and medium-chain diglyceride are preheated before stirring and mixing, with the preheating temperature being 60-70° C. and the preheating time being 10-15 minutes to improve mixing uniformity.

[0017] As a preferred solution, when adding ascorbyl palmitate and soy protein isolate, a microinjection pump is used for addition at a rate of 0.1-0.3 ml / s to ensure uniform addition.

[0018] The advantages of the present invention are: in terms of nutrition, it integrates camellia oil (containing oleic acid to lower cholesterol, etc.), medium-chain diglycerides (rapid energy supply and metabolism), ascorbyl palmitate (antioxidant and oil nutrition protection) and soy protein isolate (high-quality plant protein supplement), and multiple synergies to provide comprehensive and balanced nutrition and improve nutritional stability. During high-temperature cooking, camellia oil and medium-chain diglycerides are compounded, which has good stability, reduces oil smoke and food harmful substances residues, and can also promote nutrient dissolution, improve food nutritional value and taste. Its preparation process is precise, and the parameters of camellia oil are strictly controlled from seed selection to refining. The synthesis and addition conditions of medium-chain diglycerides are accurate, and the mixing process is meticulous, which ensures that the product quality is consistent and stable, which is conducive to industrial production. The filtration system adopts three-stage filtration. The 1μm stainless steel and polypropylene composite filter is used to initially remove large particle impurities, the 0.45μm nano-level hydrophilic coating filter is used to remove fine impurities for the second time, and the 0.22μm ultrafiltration membrane filter is used to remove microorganisms and other extremely tiny impurities for the third time. The synergistic effect makes the product highly pure, of excellent quality, and with a long shelf life, providing consumers with purer and safer edible oils and fats. DETAILED DESCRIPTION

[0019] For the purpose of the following detailed description, it should be understood that the present invention may adopt various alternative changes and step sequences, unless expressly specified to the contrary. In addition, except in any operating examples, or otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the attached claims are approximate values ​​that vary according to the desired performance to be obtained by the present invention. At least it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0020] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0021] In addition, it should be understood that any numerical range described herein is intended to include all subranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, i.e., having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.

[0022] Example 1

[0023] Raw material preparation: weigh 63 parts of camellia oil, 33 parts of medium chain diglyceride, 1.5 parts of ascorbyl palmitate, and 4 parts of soy protein isolate. The camellia oil is prepared according to the following process: screen high-quality camellia seeds, remove impurities and defective fruits, and then crush them into uniform particles with a particle size of 3 mm, squeeze them under the conditions of a pressure of 13MPa and a pressing temperature of 55°C to extract oil, and the obtained crude oil is subjected to refining steps such as degumming (using phosphoric acid with a concentration of 85%, the addition amount is 0.15% of the weight of the crude oil), deodorization (vacuum degree is 3mmHg, deodorization temperature is 190°C, and deodorization time is 1.5 hours), decolorization (the addition amount of activated white clay is 3.5% of the weight of the crude oil), deacidification (alkali refining method, the alkali concentration is 12%), dewaxing (crystallization at 6°C for 9 hours and then filtration) to obtain camellia oil. Medium chain diglyceride is diglyceride produced by enzymatic hydrolysis of coconut oil with lipase having an enzyme activity of 5000U / g, the pH value of the reaction system in the enzymatic hydrolysis reaction is 6.5, and the stirring speed is 100 rpm. The purity of ascorbyl palmitate is 95%.

[0024] Preparation process: First, stir and mix camellia seed oil and medium-chain diglyceride at 80°C at a speed of 400 rpm for half an hour, and the stirring blade adopts a double-layer turbine blade. Then slowly add ascorbyl palmitate and soy protein isolate, and keep stirring until completely dissolved. Then, the mixed solution is first filtered once with a filter with a pore size of 1μm at a flow rate of 1.2 cubic meters per hour. The filter material is a composite material of stainless steel and polypropylene, and then filtered twice with a filter with a pore size of 0.45μm at a flow rate of 0.6 cubic meters per hour. The surface of this filter has a nano-level XZ-GT01 nano-hydrophilic coating. Finally, it is filtered three times with a filter with a pore size of 0.22μm at a flow rate of 0.3 cubic meters per hour to obtain the finished camellia diglyceride oil.

[0025] Example 2

[0026] Raw material preparation: weigh 65 parts of camellia oil, 30 parts of medium-chain diglycerides, 2 parts of ascorbyl palmitate, and 3.5 parts of soy protein isolate. The preparation process of camellia oil is as follows: after screening the camellia seeds, they are crushed into granules with a particle size of 3.5 mm, and the oil is squeezed under the conditions of a pressure of 15MPa and a pressing temperature of 60°C. The crude oil is degummed (phosphoric acid concentration is 85%, the addition amount is 0.2% of the weight of the crude oil), deodorized (vacuum degree is 4mmHg, deodorization temperature is 200°C, and deodorization time is 2 hours), decolorized (activated white clay is added in an amount of 4% of the weight of the crude oil), deacidified (alkali concentration is 13%), dewaxed (filtered after crystallization for 10 hours at 7°C), and other refining steps to obtain camellia oil. Medium-chain diglycerides are diglycerides generated by enzymatic hydrolysis of coconut oil with an enzyme activity of 6500U / g lipase. The pH value of the reaction system in the enzymatic hydrolysis reaction is 7, and the stirring speed is 150 rpm. Ascorbyl palmitate purity was 96%.

[0027] Preparation process: First, stir and mix camellia seed oil and medium-chain diglyceride at 80°C at a speed of 425 rpm for half an hour, and the stirring blade adopts a double-layer turbine blade. Then slowly add ascorbyl palmitate and soy protein isolate, and keep stirring until completely dissolved. Then, the mixed solution is first filtered once with a filter with a pore size of 1μm at a flow rate of 1.5 cubic meters per hour. The filter material is a composite material of stainless steel and polypropylene, and then filtered twice with a filter with a pore size of 0.45μm at a flow rate of 0.75 cubic meters per hour. The surface of this filter has a nano-level XZ-GT01 nano-hydrophilic coating. Finally, filter three times with a filter with a pore size of 0.22μm at a flow rate of 0.35 cubic meters per hour to obtain the finished camellia diglyceride oil.

[0028] Example 3

[0029] Raw material preparation: weigh 67 parts of camellia oil, 27 parts of medium-chain diglycerides, 2.5 parts of ascorbyl palmitate, and 3 parts of soy protein isolate. The preparation process of camellia oil is as follows: after screening the camellia seeds, they are crushed into granules with a particle size of 4 mm, and the oil is squeezed under the conditions of a pressure of 17 MPa and a pressing temperature of 65°C. The crude oil is degummed (phosphoric acid concentration is 85%, and the addition amount is 0.25% of the weight of the crude oil), deodorized (vacuum degree is 5 mmHg, deodorization temperature is 210°C, and deodorization time is 2.5 hours), decolorized (activated white clay is added in an amount of 4.5% of the weight of the crude oil), deacidified (alkali concentration is 14%), dewaxed (filtered after crystallization at 8°C for 11 hours), and other refining steps to obtain camellia oil. Medium-chain diglycerides are diglycerides generated by enzymatic hydrolysis of coconut oil with an enzyme activity of 8000U / g lipase. The pH value of the reaction system in the enzymatic hydrolysis reaction is 7.5, and the stirring speed is 200 rpm. Ascorbyl palmitate purity is 97%.

[0030] Preparation process: First, stir and mix camellia seed oil and medium-chain diglyceride at 80°C at a speed of 450 rpm for half an hour, and the stirring blade adopts a double-layer turbine blade. Then slowly add ascorbyl palmitate and soy protein isolate, and keep stirring until completely dissolved. Then, the mixed solution is first filtered once with a filter with a pore size of 1μm at a flow rate of 1.8 cubic meters per hour. The filter material is a composite material of stainless steel and polypropylene, and then filtered twice with a filter with a pore size of 0.45μm at a flow rate of 0.9 cubic meters per hour. The surface of this filter has a nano-level XZ-GT01 nano-hydrophilic coating. Finally, it is filtered three times with a filter with a pore size of 0.22μm at a flow rate of 0.4 cubic meters per hour to obtain the finished camellia diglyceride oil.

[0031] Example 4

[0032] Raw material preparation: weigh 64 parts of camellia oil, 31 parts of medium-chain diglyceride, 1.8 parts of ascorbyl palmitate, and 3.8 parts of soy protein isolate. The preparation process of camellia oil is as follows: after screening camellia seeds, crush them into granules with a particle size of 3.2 mm, squeeze out the oil under the conditions of a pressure of 14 MPa and a pressing temperature of 58°C, and the crude oil is degummed (phosphoric acid concentration is 85%, the addition amount is 0.18% of the weight of the crude oil), deodorized (vacuum degree is 3.5 mmHg, deodorization temperature is 195°C, deodorization time is 1.8 hours), decolorized (activated white clay is added in an amount of 3.8% of the weight of the crude oil), deacidified (alkali concentration is 12.5%), dewaxed (crystallized at 6.5°C for 9.5 hours and filtered) and other refining steps to obtain camellia oil. Medium chain diglyceride is diglyceride produced by enzymatic hydrolysis of coconut oil with lipase having an enzyme activity of 5500U / g, the pH value of the reaction system in the enzymatic hydrolysis reaction is 6.8, the stirring speed is 120 rpm, and the purity of ascorbyl palmitate is 95.5%.

[0033] Preparation process: First, stir and mix camellia seed oil and medium-chain diglyceride at 80°C at a speed of 410 rpm for half an hour, and the stirring blade adopts a double-layer turbine blade. Then slowly add ascorbyl palmitate and soy protein isolate, and keep stirring until completely dissolved. Then, the mixed solution is first filtered once with a filter with a pore size of 1μm at a flow rate of 1.3 cubic meters per hour. The filter material is a composite material of stainless steel and polypropylene, and then filtered twice with a filter with a pore size of 0.45μm at a flow rate of 0.65 cubic meters per hour. The surface of this filter has a nano-level XZ-GT01 nano-hydrophilic coating coating. Finally, the filter with a pore size of 0.22μm is filtered three times at a flow rate of 0.32 cubic meters per hour to obtain the finished camellia diglyceride oil.

[0034] Example 5

[0035] Raw material preparation: weigh 66 parts of camellia oil, 29 parts of medium-chain diglyceride, 2.2 parts of ascorbyl palmitate, and 3.2 parts of soy protein isolate. The preparation process of camellia oil is as follows: after screening camellia seeds, crush them into granules with a particle size of 3.8 mm, squeeze them to extract oil under the conditions of a pressure of 16 MPa and a pressing temperature of 62°C, and the crude oil is subjected to refining steps such as degumming (phosphoric acid concentration of 85%, the addition amount is 0.22% of the weight of the crude oil), deodorization (vacuum degree of 4.5 mmHg, deodorization temperature of 205°C, deodorization time of 2.2 hours), decolorization (activated white clay addition amount is 4.2% of the weight of the crude oil), deacidification (alkali concentration of 13.5%), dewaxing (crystallization at 7.5°C for 10.5 hours and then filtration) to obtain camellia oil. Medium chain diglyceride is diglyceride produced by enzymatic hydrolysis of coconut oil with lipase having an enzyme activity of 7000U / g, the pH value of the reaction system in the enzymatic hydrolysis reaction is 7.2, and the stirring speed is 180 rpm. The purity of ascorbyl palmitate is 96.5%.

[0036] Preparation process: First, stir and mix camellia seed oil and medium-chain diglyceride at 80°C at a speed of 440 rpm for half an hour, and the stirring blade adopts a double-layer turbine blade. Then slowly add ascorbyl palmitate and soy protein isolate, and keep stirring until completely dissolved. Then, the mixed solution is first filtered once with a filter with a pore size of 1μm at a flow rate of 1.6 cubic meters per hour. The filter material is a composite material of stainless steel and polypropylene, and then filtered twice with a filter with a pore size of 0.45μm at a flow rate of 0.8 cubic meters per hour. The surface of this filter has a nano-level XZ-GT01 nano-hydrophilic coating coating. Finally, the filter with a pore size of 0.22μm is filtered three times at a flow rate of 0.38 cubic meters per hour to obtain the finished camellia diglyceride oil.

[0037] The comparison table of common edible oil and camellia diester oil of the present invention is shown in Table 1

[0038] Table 1

[0039]

[0040]

[0041] The advantages of the present invention are described in detail as follows:

[0042] 1. Rich in nutrients and synergistic

[0043] Multiple nutritional fusion

[0044] Camellia seed oil is rich in monounsaturated fatty acids, such as oleic acid, which has the effects of lowering cholesterol and preventing cardiovascular diseases. Medium-chain diglycerides can quickly provide energy and are not easy to accumulate fat in the body. Its unique metabolic pathway helps maintain the body's healthy metabolic state while providing energy. Ascorbyl palmitate is not only an effective antioxidant that can protect oils from oxidative rancidity and extend the shelf life, but also synergizes with unsaturated fatty acids in camellia seed oil to reduce the damage of free radicals to human cells and maintain cell health. Soy protein isolate supplements high-quality plant protein, which is of great significance for the repair, growth and maintenance of normal physiological functions of human tissues. These ingredients work together to enable camellia diglyceride oil to provide energy while meeting the body's needs for a variety of nutrients, providing consumers with a nutritionally comprehensive and balanced oil choice.

[0045] Improved nutritional stability

[0046] Due to its antioxidant properties, ascorbyl palmitate can effectively inhibit the oxidation reaction of camellia oil and medium-chain diglycerides during processing, storage and cooking. When cooking at high temperatures, oils are prone to oxidation and deterioration, producing harmful substances and reducing the activity of nutrients. Ascorbyl palmitate can capture free radicals and prevent the oxidation chain reaction of oils, thereby ensuring the stability of nutrients such as unsaturated fatty acids, medium-chain diglycerides and soy protein isolate in camellia oil, allowing consumers to fully absorb the benefits of these nutrients when eating.

[0047] 2. Excellent high temperature cooking performance

[0048] Good stability

[0049] Camellia seed oil itself has a certain high temperature resistance, and the chemical structure of medium-chain diglycerides is relatively stable, and it is not easy to decompose and produce harmful substances at high temperatures. After the two are combined, the stability of oils in high-temperature cooking environments is further improved. In high-temperature cooking methods such as frying, stir-frying, and deep-frying, camellia diglyceride oil can maintain a good chemical structure and physical properties and reduce the generation of oil smoke. Oil smoke contains a variety of harmful substances,

[0050] Such as acrolein, reducing the generation of oil smoke is not only beneficial to the cleanliness of the kitchen environment and the health of the chef, but also can reduce the residue of harmful substances in cooked food, making the cooked food healthier and more delicious.

[0051] Promotes nutrient dissolution

[0052] The camellia diester oil is beneficial to the dissolution of oil nutrients during high-temperature cooking. During the cooking process, high temperature intensifies the movement of oil molecules, and the special composition and structure of camellia diester oil can promote the nutrients therein, such as unsaturated fatty acids, vitamin E, etc., to be better dissolved into food. This allows food to absorb more beneficial nutrients during the cooking process, thereby improving the nutritional value of the food. For example, when frying vegetables, the use of camellia diester oil can enable the vegetables to better absorb the nutrients in the oil, increase the nutritional value of the dishes, and also improve the taste and flavor of the dishes.

[0053] 3. Precise technology ensures product quality

[0054] Advantages of camellia oil preparation

[0055] The preparation process of camellia oil is precisely controlled, starting from the screening of camellia seeds. Removing impurities and defective fruits can ensure the purity and quality consistency of the raw materials. Crushing into uniform particles of a specific particle size is conducive to the full extraction of oil in the subsequent oil pressing process. During the pressing process, the pressure and temperature range (13-17MPa and 55-65℃) are precisely controlled to increase the oil yield while reducing the mixing of impurities and the loss of nutrients. Subsequent refining steps, such as degumming, deodorization, decolorization, deacidification and dewaxing, have precise process parameters for each step. The use of phosphoric acid with a specific concentration and addition amount during degumming can effectively remove impurities such as phospholipids in crude oil and improve the stability of oil; the vacuum degree, temperature and time control during the deodorization process can completely remove odor substances in oil and improve the flavor quality of oil; the reasonable addition of activated white clay during decolorization ensures the clear color of the oil; deacidification and dewaxing treatment further improve the purity and quality stability of the oil. The camellia seed oil prepared through this series of processes lays a solid foundation for the high quality of camellia diester oil.

[0056] Precision synthesis and addition of medium chain diglycerides

[0057] Medium-chain diglycerides are produced by enzymatic hydrolysis of coconut oil under the catalysis of lipase with specific enzyme activity (5000-8000U / g), and the pH value (6.5-7.5) and stirring speed (100-200 rpm) of the reaction system are precisely controlled. Such precise synthesis conditions can ensure the yield and quality stability of medium-chain diglycerides. The appropriate pH value provides a suitable acid-base environment for the enzymatic hydrolysis reaction, promoting the efficient reaction; continuous stirring ensures the uniformity of the reaction system, allowing the reactants to fully contact and improve the reaction conversion rate. When mixed with camellia seed oil, precise addition amount (27-33 parts) and specific mixing process, such as preheating (60-70°C, 10-15 minutes), specific rotation speed (400-450 rpm) and stirring blade (double-layer turbine blade), as well as the use of a micro-injection pump to add ascorbyl palmitate and soy protein isolate at a specific rate (0.1-0.3 ml / s), all ensure that the various components can be evenly mixed to form a stable oil system, thereby ensuring the consistency and stability of the quality of the camellia diester oil product, and facilitating industrial production and quality control.

[0058] 4. Filtration system ensures product purity

[0059] Multi-stage filtration for efficient impurity removal

[0060] The three-stage filtration system used plays a key role in improving the purity of camellia diester oil. First, a stainless steel and polypropylene composite filter with a pore size of 1μm performs preliminary filtration at a flow rate of 1.2-1.8 cubic meters per hour, which can remove larger particles of impurities, such as undissolved solid particles and some colloids. This composite filter has both the strength and corrosion resistance of stainless steel and the good filtration performance of polypropylene. Next, a filter with a pore size of 0.45μm and a nano-scale hydrophilic coating on the surface performs secondary filtration at a flow rate of 0.6-0.9 cubic meters per hour. The hydrophilic coating can improve the filter's ability to adsorb and retain tiny impurities, and further remove even finer impurities, such as residual colloidal particles and tiny fibers. Finally, the filter screen made of ultrafiltration membrane technology with a pore size of 0.22μm is filtered three times at a flow rate of 0.3-0.4 cubic meters per hour, which can effectively remove microorganisms such as bacteria and viruses and extremely small impurity particles, ensuring the purity and hygienic safety of camellia diester oil. The synergistic effect of the multi-stage filtration system makes the impurity content in the product extremely low, improves the quality and stability of the product, extends the shelf life of the product, and provides consumers with purer and safer edible oils.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Camellia diester oil suitable for high temperature cooking and conducive to the dissolution of oil nutrients, characterized in that: The invention is composed of the following raw materials in parts by weight: 63-67 parts of camellia oil, 27-33 parts of medium chain diglyceride, 1.5-2.5 parts of ascorbyl palmitate, and 3-4 parts of isolated soy protein; The camellia seed oil is prepared by the following process: firstly, the camellia seeds are screened to remove impurities and defective fruits, and then crushed into uniform particles with a particle size of 3-4 mm, and then the crude oil is squeezed under the conditions of a pressure of 13-17 MPa and a pressing temperature controlled at 55-65° C., and then the crude oil is subjected to the following refining steps in sequence: phosphoric acid with a concentration of 85% is used as a degumming agent, and the addition amount thereof is 0.15-0.25% of the weight of the crude oil for degumming treatment; deodorization treatment is carried out under the conditions of a vacuum degree of 3-5 mmHg, a deodorization temperature of 190-210° C., and a deodorization time of 1.5-2.5 hours; activated white clay is used as a decoloring agent, and the addition amount thereof is 3.5-4.5% of the weight of the crude oil for decolorization treatment; deacidification treatment is carried out by an alkali refining method, and the concentration of the alkali solution is 12-14%; and dewaxing treatment is carried out after crystallization at 6-8° C. for 9-11 hours, thereby obtaining the camellia seed oil.

2. The camellia diester oil according to claim 1, characterized in that The medium-chain diglyceride is a diglyceride generated by enzymatic hydrolysis of coconut oil by lipase with an enzyme activity of 5000-8000U / g.

3. The camellia diester oil according to claim 2, characterized in that In the enzymatic hydrolysis reaction of the medium-chain diglyceride, the pH value of the reaction system is controlled at 6.5-7.5, and stirring is continued during the reaction at a speed of 100-200 rpm.

4. The camellia diester oil according to claim 1, characterized in that The purity of the ascorbyl palmitate is not less than 95%.

5. A method for preparing the camellia diester oil according to any one of claims 1 to 4, characterized in that: The following steps are involved: First, the camellia seed oil and medium-chain diglyceride are stirred and mixed at 80° C. at a speed of 400-450 rpm for half an hour, with a double-layer turbine blade as the stirring blade. Then, ascorbyl palmitate and soy protein isolate are slowly added and stirred until they are completely dissolved. After that, the mixed solution is filtered through a filtering device to remove solid impurities, and a finished camellia diglyceride oil can be obtained.

6. The method according to claim 5, characterized in that The filtering device adopts a three-stage filtering system, first filtering once with a filter with a pore size of 1 μm at a flow rate of 1.2-1.8 cubic meters per hour, the filter material is a composite material of stainless steel and polypropylene, then filtering twice with a filter with a pore size of 0.45 μm at a flow rate of 0.6-0.9 cubic meters per hour, the surface of the filter has a nano-level hydrophilic coating, and finally filtering three times with a filter with a pore size of 0.22 μm at a flow rate of 0.3-0.4 cubic meters per hour.

7. The method according to claim 5, characterized in that Before stirring and mixing, the camellia seed oil and medium-chain diglyceride are preheated at a temperature of 60-70° C. for 10-15 minutes to improve mixing uniformity.

8. The method according to claim 5, characterized in that When ascorbyl palmitate and soy protein isolate were added, a microinjection pump was used at a rate of 0.1-0.3 ml / s to ensure uniform addition.

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