Diglyceride-containing grease composition and preparation method thereof

Abstract

The invention relates to the technical field of diglyceride oil, and discloses a diglyceride-containing grease composition and a preparation method thereof. According to the present invention, a variety of vegetable oils are combined, the combined vegetable oil is subjected to glycerol diesterification, and the turmeric is directly extracted by using the oil after the enzymolysis so as to integrally prepare the curcumin-containing diglyceride oil; according to the present invention, the mass content of diglyceride in the diglyceride oil prepared by combining a plurality of vegetable oils is 40-95%, the mass content of oryzanol is 10000-20000 ppm, the mass content of sterol is 8000-10000 ppm, and the mass content of curcumin is 0.1-0.2%, such that the diglyceride, the oryzanol, the sterol and the curcumin in the diglyceride oil are subjected to a specific content and proportion so as to prevent the color reversion of the oil composition, such that the color reversion of the oil composition can be prevented, and the oil composition can be easily obtained. The grease composition keeps bright appearance and has the advantage of being good in stability.

Description

Technical Field

[0001] The present invention relates to the technical field of diglyceride oil, and in particular to a diglyceride-containing oil composition and a preparation method thereof. Background Art

[0002] Diacylglycerol (DG, DAG) is a lipid in which a fatty acid in triglyceride (TAG) is replaced by a hydroxyl group. It is a fat molecule with only two fatty acid chains. Compared with triglycerides, diacylglycerol is more easily converted in the body and can reduce accumulation. Eating DAG has the effects of reducing visceral fat, inhibiting weight gain, and lowering blood lipids, and has received widespread attention. Diacylglycerol oil is favored by people as a healthy oil.

[0003] Color reversion refers to the phenomenon that the color of edible oil changes significantly over time during storage and use. The mechanism and inhibition methods of oil color reversion have always troubled the oil academic and industrial circles. All oil varieties will experience color reversion, and the color reversion of different oils is different. Studies have shown that about 60% of oils will experience a darker color reversion during storage, among which corn oil has the most serious color reversion, with a color reversion rate of up to 95.9%.

[0004] In order to slow down the color reversion of oils and fats, the common practice is to add an appropriate amount of antioxidants, such as tertiary butylhydroquinone (TBHQ), to the oils and fats. However, according to food standards, the amount of antioxidants added is limited, and the limit is small. The addition of small doses of antioxidants has limited effect in alleviating the color reversion of oils and fats. Summary of the invention

[0005] In order to solve the color reversion problem of diglyceride oil, the present invention provides a grease composition containing diglyceride and a preparation method thereof. The present invention combines multiple vegetable oils for enzymolysis, and uses the enzymolyzed oil to extract turmeric to obtain a diglyceride oil containing curcumin. The present invention combines multiple vegetable oils and extracts an appropriate amount of curcumin, so that the diglyceride, oryzanol, sterol, and curcumin components in the final diglyceride oil are in a specific content and ratio, prevents the diglyceride oil from color reversion, and keeps the diglyceride oil bright in appearance. The diglyceride oil has the characteristics of good stability.

[0006] The specific technical scheme of the present invention is: In one aspect, the present invention provides a grease composition containing diglyceride and a preparation method thereof, comprising the following steps: Mixing various vegetable oils, adding lipase, enzymolysis, standing, taking the upper layer of material and subjecting it to molecular distillation, adding turmeric, extracting, filtering, and obtaining a grease composition containing diglyceride; In the oil composition, the mass content of diglyceride is 40% to 95%, the mass content of oryzanol is 10000 ppm to 20000 ppm, the mass content of sterol is 8000 ppm to 10000 ppm, and the mass content of curcumin is 0.1% to 0.2%.

[0007] The present invention combines multiple vegetable oils, performs diglycerol esterification on the combined vegetable oils, and directly extracts turmeric using the oil after enzymolysis, so as to prepare the diglyceride oil containing curcumin in an integrated manner, so that the mass content of diglyceride in the diglyceride oil of the combination of multiple vegetable oils is 40% to 95%, the mass content of oryzanol is 10000ppm to 20000ppm, the mass content of sterol is 8000ppm to 10000ppm, and the mass content of curcumin is 0.1% to 0.2%. That is, the diglyceride, oryzanol, sterol, and curcumin components in the oil composition are in specific contents and proportions, thereby preventing the diglyceride oil from recoloring and maintaining a bright appearance. The diglyceride oil has the advantage of good stability.

[0008] If any component index of the oil composition prepared by the method is not within the range, the color reversion problem of the diglyceride oil product may not be effectively solved and there is still an obvious color reversion problem. The relevant reasons are as follows: (1) Diaglyceride is a lipid in which one fatty acid in triglyceride is replaced by a hydroxyl group. It is a fat molecule with only two fatty acid chains. The oxidation of the hydroxyl sites on it will cause free radicals to be generated in the diglyceride oil, and the presence of free radicals is an important factor affecting the color reversion of oil. Therefore, in the diglyceride oil, the content of diglyceride should not be too high, otherwise the color reversion problem will be aggravated. Diaglyceride has the effects of reducing visceral fat, inhibiting weight gain, and lowering blood lipids, which is beneficial to health. The addition of oryzanol and curcumin within a certain range can increase the content of the diglyceride, so that the mass content of diglyceride is 40%~95%, and the appearance can be kept stable.

[0009] (2) Oryzanol has an antioxidant effect. Existing literature shows that oryzanol helps protect cells from oxidative damage. Curcumin is an active polyphenol compound with powerful anti-inflammatory and antioxidant effects, which helps prevent a variety of chronic diseases. In the present diglyceride oil, controlling the content of oryzanol and curcumin within a certain range can effectively prevent the oil in the diglyceride oil from being oxidized, prevent the generation of excessive free radicals in the diglyceride oil, and prevent its color reversion, so that the product appearance can remain unchanged during a long shelf life. The content of oryzanol and curcumin cannot be too little, otherwise the diglyceride oil will still have obvious color reversion problems. The content of oryzanol and curcumin cannot be too much. If it is too much, the diglyceride oil will still have a certain color reversion phenomenon. This shows that in the diglyceride oil prepared by this method, the various components therein may interact with each other and work together to maintain the stability of the diglyceride oil system and ensure the long-term stability of the appearance.

[0010] (3) Sterols are a type of cyclopentane polyhydrophenanthrene derivatives formed by the fusion of three hexane rings and one cyclopentane. Their basic structure is cyclopentane polyhydrophenanthrene and contains hydroxyl groups. Sterols have the effect of lowering blood cholesterol and are beneficial to heart health. In this diglyceride oil, a large amount of sterols is contained, which helps prevent the oil in the diglyceride oil from being oxidized, prevents the diglyceride oil from generating too many free radicals, and prevents its color reversion. The large amount of sterols is 8000ppm to 10000ppm. Here, a large amount means that the content is larger than that of ordinary oils.

[0011] As a preferred embodiment of the above preparation method, the vegetable oil includes corn oil, rice oil and garlic oil.

[0012] As another preferred embodiment of the above preparation method, the vegetable oil includes soybean oil, rice oil, linseed oil and garlic fruit oil.

[0013] Corn oil and soybean oil are vegetable oils with obvious color reversion problems. In order to solve the color reversion problem of corn oil, based on the above method of the present invention, when a grease composition containing diglycerides is prepared by combining "corn oil, rice oil, garlic fruit oil", and the diglycerides, oryzanol, sterols, and curcumin components therein meet the above content range and ratio, the color reversion of the diglyceride oil can be effectively alleviated, so that the corn oil diglyceride oil maintains a lasting and stable appearance. In order to solve the color reversion problem of soybean oil, based on the above method of the present invention, when a grease composition containing diglycerides is prepared by combining "soybean oil, rice oil, garlic fruit oil", and the diglycerides, oryzanol, sterols, and curcumin components therein meet the above content range and ratio, the color reversion problem of the grease composition can be effectively alleviated, so that the soybean oil diglyceride oil maintains a lasting and stable appearance.

[0014] As a preferred preparation method, the mass content of oleic acid in the diglyceride oil is 31% to 48% based on the mass of the fatty acids therein.

[0015] When the mass proportion of oleic acid in the fatty acids is controlled within a certain range, the appearance stability of the diglyceride oil of the present invention can be further improved.

[0016] As a preferred embodiment of the above preparation method, the temperature of the enzymatic hydrolysis is 40-70° C., and the time of the enzymatic hydrolysis is 5-10 hours.

[0017] As a preferred embodiment of the above preparation method, the molecular distillation comprises the following steps: taking the upper layer material and performing molecular distillation at 180-195° C. to take the heavy phase fraction.

[0018] This step mainly removes monoglycerides.

[0019] More preferably, the molecular distillation further comprises the following steps: taking a heavy phase fraction and performing molecular distillation at 215-225° C. to take a light phase fraction.

[0020] This step mainly removes triglycerides.

[0021] As a preferred embodiment of the above preparation method, turmeric is added at a mass ratio of the substance obtained after molecular distillation to turmeric of (25-5):1, and stirred at 10-60°C.

[0022] The present invention directly extracts curcumin from turmeric through the material after molecular distillation, and the present invention has a high extraction rate, a simple process, and no additional solvent removal operation is required. In order to further improve the extraction rate, the light phase fraction obtained after secondary molecular distillation is preferably used for extraction.

[0023] More preferably, the stirring time is 10 to 60 minutes.

[0024] In another aspect, the present invention provides a diglyceride oil, which is prepared by the above-mentioned preparation method.

[0025] The diglyceride oil is made by combining multiple vegetable oils and extracting an appropriate amount of curcumin, so that the diglyceride, oryzanol, sterol and curcumin components in the final diglyceride oil have specific contents and proportions, effectively alleviating the color reversion phenomenon of the diglyceride oil, and keeping the diglyceride oil bright in appearance. The diglyceride oil has the advantage of good stability. In order to make the diglyceride oil have the above advantages, the mass content of diglyceride is required to be 40% to 95%, the mass content of oryzanol is 10000ppm to 20000ppm, the mass content of sterol is 8000ppm to 10000ppm, and the mass content of curcumin is 0.1% to 0.2%.

[0026] Compared with the prior art, the present invention has the following technical effects: 1. The present invention combines multiple vegetable oils, performs diglycerol esterification on the combined vegetable oils, and directly extracts turmeric using the oil after enzymolysis, and prepares the diglyceride oil containing curcumin in an integrated manner, so that the mass content of diglyceride in the diglyceride oil of the combination of multiple vegetable oils is 40% to 95%, the mass content of oryzanol is 10000ppm to 20000ppm, the mass content of sterol is 8000ppm to 10000ppm, and the mass content of curcumin is 0.1% to 0.2%. That is, the diglyceride, oryzanol, sterol, and curcumin components in the diglyceride oil are in specific contents and proportions, thereby preventing the diglyceride oil from recoloring and keeping the diglyceride oil bright in appearance. The diglyceride oil has the advantage of good stability.

[0027] 2. The diglyceride oil prepared by the present invention contains 40% to 95% (weight) of diglyceride, and is applied to edible oil and food, and can reduce visceral fat, inhibit weight gain, and lower blood lipids; at the same time, it can provide a higher content of oleic acid, linoleic acid, linolenic acid and neuraminic acid nutrients, and the high-quality fatty acids are beneficial to health; in addition, it contains oryzanol, sterols, and curcumin, and has anti-inflammatory and antioxidant effects.

[0028] 3. The present invention directly extracts curcumin and can make the prepared diglyceride oil have a higher content of curcumin and a higher extraction rate. Compared with the prior art, the extraction process is simple and no additional solvent removal operation is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the appearance of the diglyceride oil prepared in Comparative Example 9 before being placed; Figure 2 This is the appearance of the diglyceride oil prepared in Comparative Example 9 after being stored for three months. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should belong to the scope of protection of the present invention.

[0031] The content of each component in the diglyceride oil of the present invention is determined, and the detection method of triglyceride, diglyceride, monoglyceride and free fatty acid refers to GB / T 26636-2011; the determination of animal and plant oils and fats and polymerized triglycerides adopts high performance steric exclusion chromatography (HPSEC); the detection method of fatty acid composition refers to the national standard method GB / T 5009.168-2016 "Determination of Fatty Acids in Food": the mixed fatty acids in the product are methylated and then detected by gas chromatograph, and 37 kinds of fatty acid methyl ester standards are used as standards, and the area normalization method is used for quantitative analysis; the detection method of oryzanol refers to the grain and oil detection-determination of oryzanol content in vegetable oil in LS / T6121.1-2017, and spectrophotometry is adopted; the detection method of sterol refers to the animal and plant oils-sterol composition and total sterol determination in GB / T 25223-2013, and gas chromatography is adopted; the detection method of curcumin content refers to GB 1886.76-2015 "Determination of curcumin content in oils and fats".

[0032] Example 1 Provided is a diglyceride oil, the preparation method comprising the following steps: Take 200g soybean oil, 400g rice oil, 350g corn oil, and 50g garlic oil and stir them at room temperature for 20min in a stirring tank, mix them evenly, and get blended oil. Take 1000g blended oil, 1000g glycerol, and 50g lipase, place them in a round-bottomed flask, stir them in a 60℃ water bath, and react at a constant temperature for 10 hours. Stand still and take the upper layer of oil, remove monoglyceride with molecular distillation equipment at 180℃, take the heavy phase fraction, and then distill with molecular distillation equipment at 220℃ to remove triglyceride, take the light phase fraction, and get a diglyceride oil composition. Add the diglyceride oil composition to turmeric at a mass ratio of 25:1 into a round-bottomed flask, stir at 400rpm for 50min at 40℃, and filter to obtain diglyceride oil containing curcumin. The obtained curcumin-containing diglyceride oil was taken for determination of diglyceride, oryzanol, sterol, curcumin, and nervonic acid contents, and the weight percentages of oleic acid, linoleic acid, and linolenic acid in its fatty acids were determined. The results are shown in Tables 1 and 2.

[0033] Example 2 Provided is a diglyceride oil, the preparation method comprising the following steps: Take 800g of rice oil, 150g of rapeseed oil, and 50g of garlic oil and stir them at room temperature for 20min in a stirring tank, mix them evenly, and get blended oil. Take 1000g of blended oil, 800g of glycerol, and 30g of lipase, place them in a round-bottom flask, stir them in a 60℃ water bath, and react at a constant temperature for 10 hours. Let it stand and take the upper layer of oil, remove the monoglyceride with a molecular distillation device at 195℃, take the heavy phase fraction, and then distill it with a molecular distillation device at 220℃ to remove triglycerides, take the light phase fraction, and get a diglyceride oil composition. Add the diglyceride oil composition to turmeric in a mass ratio of 5:1 into a round-bottom flask, stir at 400rpm for 50min at 40℃, and filter to obtain a diglyceride oil containing curcumin. The obtained curcumin-containing diglyceride oil was taken for determination of diglyceride, oryzanol, sterol, curcumin, and nervonic acid contents, and the weight percentages of oleic acid, linoleic acid, and linolenic acid in its fatty acids were determined. The results are shown in Tables 1 and 2.

[0034] Example 3 Provided is a diglyceride oil, the preparation method comprising the following steps: Take 500g of rice oil, 250g of sunflower oil, 200g of linseed oil, and 50g of garlic oil and stir them at room temperature for 20min in a stirring tank, mix them evenly, and get blended oil. Take 1000g of blended oil, 800g of glycerol, and 30g of lipase, place them in a round-bottom flask, stir them in a 60℃ water bath, and react at a constant temperature for 10 hours. Let it stand and take the upper layer of oil, remove the monoglyceride with a molecular distillation device at 180℃, take the heavy phase fraction, and then distill it with a molecular distillation device at 215℃ to remove triglycerides, take the light phase fraction, and get a diglyceride oil composition. Add the diglyceride oil composition to turmeric in a mass ratio of 15:1 into a round-bottom flask, stir at 400rpm for 50min at 40℃, and filter to obtain a diglyceride oil containing curcumin. The obtained curcumin-containing diglyceride oil was taken for determination of diglyceride, oryzanol, sterol, curcumin, and nervonic acid contents, and the weight percentages of oleic acid, linoleic acid, and linolenic acid in its fatty acids were determined. The results are shown in Tables 1 and 2.

[0035] Example 4 Provided is a diglyceride oil, the preparation method comprising the following steps: Take 400g of rice oil, 570g of corn oil, and 30g of garlic oil and stir them at room temperature for 20min in a stirring tank, mix them evenly, and get blended oil. Take 1000g of blended oil, 1000g of glycerol, and 50g of lipase, place them in a round-bottomed flask, stir them in a 60℃ water bath, and react at a constant temperature for 10 hours. Let it stand and take the upper layer of oil, remove the monoglyceride with a molecular distillation device at 180℃, take the heavy phase fraction, and then distill it with a molecular distillation device at 220℃ to remove triglycerides, take the light phase fraction, and get a diglyceride oil composition. Add the diglyceride oil composition to turmeric at a mass ratio of 25:1 into a round-bottomed flask, stir at 400rpm for 60min at 50℃, and filter to obtain a diglyceride oil containing curcumin. The obtained curcumin-containing diglyceride oil was taken for determination of diglyceride, oryzanol, sterol, curcumin, and nervonic acid contents, and the weight percentages of oleic acid, linoleic acid, and linolenic acid in its fatty acids were determined. The results are shown in Tables 1 and 2.

[0036] Comparative Example 1 The main difference between this comparative example and Example 1 is that 300 g of soybean oil, 400 g of rice oil, 250 g of linseed oil and 50 g of garlic oil are used to prepare blended oil; the enzymatic hydrolysis reaction time is changed to 3 hours; and the content of diglyceride in the final diglyceride oil is 38.5%. The other operating steps are the same as those in Example 1.

[0037] Comparative Example 2 The main difference between this comparative example and Example 1 is that 400g of rice oil, 420g of olive oil, 100g of sunflower oil and 30g of garlic fruit oil are used to prepare blended oil; the enzymatic reaction time is modified to 20 hours; monoglyceride is removed by molecular distillation equipment at 195°C, and then distilled by molecular distillation equipment at 215°C, and the light phase fraction is taken to obtain a diglyceride oil composition, so that the content of diglyceride in the final diglyceride oil is 96.1%. The other operating steps are the same as those in Example 1.

[0038] Comparative Example 3 The main difference between this comparative example and Example 1 is that 450 g of rapeseed oil, 300 g of rice oil, 200 g of corn oil and 50 g of garlic fruit oil are used to prepare blended oil, and the oryzanol content in the final diglyceride oil is 7589 ppm. The other operating steps are the same as those in Example 1.

[0039] Comparative Example 4 The main difference between this comparative example and Example 1 is that 950 g of rice oil and 50 g of garlic fruit oil are used to prepare blended oil, and the oryzanol content in the final diglyceride oil is 22568 ppm. The other operating steps are the same as those in Example 1.

[0040] Comparative Example 5 The main difference between this comparative example and Example 1 is that 400 g of rice oil, 200 g of olive oil, 350 g of linseed oil and 50 g of garlic fruit oil are used to prepare blended oil, and the sterol content in the final diglyceride oil is 7045 ppm. The other operating steps are the same as those in Example 1.

[0041] Comparative Example 6 The main difference between this comparative example and Example 1 is that 900 g of rice oil, 50 g of linseed oil and 50 g of garlic oil are used to make the sterol content in the final diglyceride oil 11898 ppm. The other operating steps are the same as those in Example 1.

[0042] Comparative Example 7 The main difference between this comparative example and Example 1 is that the mass ratio of the diglyceride oil composition to turmeric is 30:1, and the mixture is added into a round-bottom flask, and stirred at 400 rpm for 30 min at 25° C., so that the curcumin content in the final diglyceride oil is 0.046%. The other operation steps are the same as those in Example 1.

[0043] Comparative Example 8 The main difference between this comparative example and Example 1 is that the mass ratio of the diglyceride oil composition to turmeric is 5:1, and the mixture is added into a round-bottom flask, and stirred at 400 rpm for 60 min at 50° C., so that the curcumin content in the final diglyceride oil is 3.102%. The other operation steps are the same as those in Example 1.

[0044] Comparative Example 9 The main difference between this comparative example and Example 1 is that turmeric is not added, but TBHQ (tert-butylhydroquinone) is added instead. The preparation is carried out according to the following steps: Take 200g soybean oil, 400g rice oil, 350g corn oil, and 50g garlic oil and stir them at room temperature for 20min in a stirring tank, mix them evenly, and get blended oil. Take 1000g blended oil, 1000g glycerol, and 50g lipase, place them in a round-bottom flask, stir them in a 60°C water bath, and react at a constant temperature for 10 hours. Stand still and take the upper layer of oil, remove monoglyceride with a molecular distillation device at 180°C, take the heavy phase fraction, and then distill with a molecular distillation device at 220°C to remove triglycerides, take the light phase fraction, and obtain a diglyceride oil composition. Add TBHQ to the diglyceride oil composition so that the mass content of TBHQ is 120mg / kg to obtain a diglyceride oil. The obtained diglyceride oil was measured for the content of diglyceride, oryzanol, sterol, and nervonic acid, and the weight percentage of oleic acid, linoleic acid, and linolenic acid in its fatty acids was measured. The results are shown in Tables 1 and 2.

[0045] Table 1 Table 2 Performance Characterization The diglyceride oil prepared in each embodiment and each comparative example was tested for its oil color red value, then canned, sealed, and placed at 40°C for three months (92 days in total), taken out, and the oil color red value was tested again. The results are shown in Table 3. Among them, if the difference in the color red value before and after placement is greater than 1.5, the color reversion is serious.

[0046] like Figure 1 As shown, this is the appearance of the diglyceride oil prepared in Comparative Example 9 before being placed. Figure 2 As shown, it is the appearance picture after being placed for three months. Figure 1 , Figure 2 By comparison, it can be seen that the comparative example 9 has a large color difference before and after placement, severe color return, and poor appearance stability.

[0047] Table 3 Combined with the data analysis in Tables 1 to 3: (1) By comparing Comparative Example 9 with Example 1, it can be seen that even if an antioxidant is added to Comparative Example 9, its appearance is still unstable and the color reversion is still relatively serious. It can be seen that the effect of avoiding color reversion is not only brought about by the antioxidant property of curcumin. From the data of Examples 1 to 4 in Table 1, it can be seen that the mass content of diglycerol in the diglyceride oil is controlled to be 40% to 95%, the mass content of oryzanol is controlled to be 10000ppm to 20000ppm, the mass content of sterol is 8000ppm to 10000ppm, and the mass content of curcumin is controlled to be 0.1% to 0.2%. Combined with the data of the difference in color red value before and after placement in Table 3, it can be seen that by controlling the above content, a diglyceride oil with good appearance stability can be obtained, which can avoid color reversion.

[0048] In summary, it can be shown that the present invention combines a plurality of vegetable oils, performs diglycerol esterification on the combined vegetable oils, and directly extracts turmeric using the oil after enzymolysis, so as to prepare the diglyceride oil containing curcumin in an integrated manner, so that the mass content of diglyceride in the diglyceride oil of the combination of the plurality of vegetable oils is 40% to 95%, the mass content of oryzanol is 10000ppm to 20000ppm, the mass content of sterol is 8000ppm to 10000ppm, and the mass content of curcumin is 0.1% to 0.2%, that is, the diglyceride, oryzanol, sterol and curcumin components in the diglyceride oil are in specific contents and proportions, thereby preventing the diglyceride oil from recoloring and maintaining a bright appearance, and the diglyceride oil has the advantage of good stability.

[0049] (2) Comparative analysis of Comparative Examples 1 and 2 with Example 1 shows that the mass contents of diglyceride in Comparative Examples 1 and 2 are 38.5% and 96.1%, respectively, which are not within the range of 40% to 95%. After standing, the red value of the color increases greatly, and the color reversion is serious.

[0050] From the comparative analysis of Comparative Examples 3-4 and Example 1, it can be seen that the mass contents of oryzanol in Comparative Examples 3-4 are 7589ppm and 22568ppm respectively, which are not within the range of 10000ppm to 20000ppm. After being left standing, the red value of the color increases greatly and the color reversion is serious.

[0051] From the comparative analysis of Comparative Examples 5-6 and Example 1, it can be seen that the sterol mass contents of Comparative Examples 5-6 are 7045ppm and 11898ppm respectively, which are not within the range of 8000ppm-10000ppm. After standing, the red value of the color increases greatly and the color reversion is serious.

[0052] From the comparative analysis of Comparative Examples 7-8 and Example 1, it can be seen that the mass contents of curcumin in Comparative Examples 7-8 are 0.046% and 3.102%, respectively, which are not within the range of 0.1% to 0.2%. After being placed, the red value of the color increases greatly, and the color return is serious.

[0053] In summary, it can be seen from Comparative Examples 1 to 8 that the present invention prevents the diglyceride oil from recoloring and keeps the diglyceride oil bright in appearance, and it is necessary to make the diglyceride mass content in the diglyceride oil be 40% to 95%, the mass content of oryzanol be 10000ppm to 20000ppm, the mass content of sterol be 8000ppm to 10000ppm, and the mass content of curcumin be 0.1% to 0.2%.

[0054] (3) At the same time, by comparing comparative examples 1-2 with example 1, it can be seen that the mass contents of oleic acid in fatty acids of comparative examples 1-2 are 29.05% and 52.78% respectively, which are not within the range of 31%-48%. This shows that the color reversion problem of comparative examples 1-2 may also be caused by the oleic acid content not being within the range of 31%-48%.

[0055] In the examples of the present invention, the lipase used is Novozymes lipase 435.

[0056] In the embodiment of the present invention, the red value of the color is tested using a British Lovibond colorimeter, model FX.

[0057] The raw materials and equipment used in the present invention, unless otherwise specified, are all commonly used raw materials and equipment in the art; the methods used in the present invention, unless otherwise specified, are all conventional methods in the art.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a diglyceride-containing oil composition, characterized in that: The following steps are involved: Mixing various vegetable oils, adding lipase, enzymolysis, standing, taking the upper layer of material and subjecting it to molecular distillation, adding turmeric, extracting, filtering, and obtaining a grease composition containing diglyceride; In the oil composition, the mass content of diglyceride is 40% to 95%, the mass content of oryzanol is 10000 ppm to 20000 ppm, the mass content of sterol is 8000 ppm to 10000 ppm, and the mass content of curcumin is 0.1% to 0.2%.

2. The method for preparing a diglyceride-containing oil composition according to claim 1, wherein: The vegetable oils include corn oil, rice oil and garlic oil.

3. The method for preparing a diglyceride-containing oil composition according to claim 1, characterized in that: The vegetable oils include soybean oil, rice oil, linseed oil and garlic oil.

4. The method for preparing a diglyceride-containing oil composition according to claim 1, characterized in that: In the oil and fat composition, the mass content of oleic acid is 31% to 48% based on the mass of fatty acids therein.

5. The method for preparing a diglyceride-containing oil composition according to claim 1, characterized in that: The temperature of the enzymolysis is 40-70° C., and the time of the enzymolysis is 5-10 hours.

6. The method for preparing a diglyceride-containing oil composition according to claim 1, characterized in that: The molecular distillation comprises the following steps: taking the upper layer material and performing molecular distillation at 180-195° C. to take the heavy phase fraction.

7. The method for preparing a diglyceride-containing oil composition according to claim 6, characterized in that: The molecular distillation further comprises the following steps: taking a heavy phase fraction and performing molecular distillation at 215-225° C. to take a light phase fraction.

8. The method for preparing a diglyceride-containing oil composition according to claim 1, characterized in that: The leaching and extraction method is: adding turmeric at a mass ratio of (25-5):1 between the substance obtained after molecular distillation and turmeric, and stirring at 10-60°C.

9. The method for preparing a diglyceride-containing oil composition according to claim 8, characterized in that: The stirring time is 10 to 60 minutes.

10. The oil and fat composition prepared by the preparation method according to any one of claims 1 to 9.

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