A production method of ultra-high oryzanol rice oil

Abstract

The invention relates to the technical field of rice oil refining, and in particular to a method for producing extra-high oryzanol rice oil. The method has the following steps: 1. Front-end treatment of crude rice bran oil: crude rice bran oil is subjected to degumming, dewaxing, and primary decolorization to obtain primary decolorized oil; 2. The primary decolorized oil is divided into two parts and used for the following two production routes respectively: Route 1: low-oryzanol rice oil product route, and Route 2: extra-high oryzanol rice oil product route. The invention can stably produce extra-high oryzanol rice oil with a oryzanol content of ≥4% (40000ppm), and at the same time has the effect of enriching other beneficial components (phytosterols, squalene). In addition, its physical and chemical indicators, hygiene indicators, and food safety indicators are basically the same as those of conventional refined rice oil, and meet the relevant standards for edible rice oil.

Description

Technical field:

[0001] The invention relates to the technical field of rice oil refining, and in particular to a production method of extra-high oryzanol rice oil. Background technology:

[0002] Rice bran oil, also known as rice bran oil, brown rice oil, etc., is a byproduct of rice processing, namely rice bran or rice germ, which is obtained by pressing or leaching the crude rice bran oil, and then further refined (physical or chemically). Rice bran oil is rich in oryzanol, phytosterols, vitamin E, squalene and other bioactive substances, and its fatty acid ratio is close to the standard recommended by the World Nutrition Association (saturated fatty acids: monounsaturated fatty acids: polyunsaturated fatty acids = 1:1:1). It is considered a natural healthy oil and enjoys the reputation of "heart oil", "youth oil" and "rice gold". It is also a healthy edible oil recommended by the American Heart Association (AHA) and the World Health Organization (WHO).

[0003] The content of oryzanol is a characteristic indicator of rice oil, which is widely praised for its anti-inflammatory, lipid-lowering, nerve-regulating and other active functions, as well as the naturalness of oryzanol in rice oil. Purified oryzanol is directly used as a drug: oryzanol tablets, and phytosterols are also the main medicinal ingredients of furfural sterol tablets / periodonting, and vitamin E itself is a nutritional enhancer.

[0004] The content of oryzanol in crude rice oil is between 1.8% and 2.8% (depending on the region and rice type). However, after physical refining / chemical refining and other processing steps, the oryzanol content retained in the finished rice oil is only 0.3%-1.8% (depending on the process), and the nutritional value is greatly reduced.

[0005] At present, there have been many studies to reduce the loss of oryzanol in the refining process of rice oil and retain more nutrients. For example, Chinese patent CN 112063452A discloses a production method of health-care rice oil, by adding 0.15%-0.25% oryzanol, 0.15%-0.25% phytosterol, and 0.05%-0.15% vitamin E to refined rice oil to form a health-care rice oil; CN 115232664A discloses a rice oil refining method to prevent the nutrients in rice oil from being destroyed or adsorbed, and the oryzanol in the finished rice oil can reach 1.6% (16000ppm); CN 117701336A discloses a refining method for comprehensively controlling nutrients and harmful substances in rice oil, and the oryzanol loss rate in the whole refining process is ≤15% (converted oryzanol content 20000ppm). And so on.

[0006] At present, the research that we can find for the purpose of improving the nutritional content of rice bran oil is basically focused on: ① How to reduce the loss of oryzanol in the refining process of rice bran oil and retain more oryzanol; ② Directly add oryzanol to the finished product to increase the oryzanol content; two research directions, so as to achieve the purpose of increasing the oryzanol content in the finished rice bran oil. However, both of the above schemes have great defects: (1) The method of optimizing the process and reducing the loss of oryzanol in the refining process is seriously restricted by the oryzanol content of the raw material of rice bran crude oil. Theoretically, the best effect of this method is that oryzanol is 100% retained, and the oryzanol content of the finished rice bran oil is similar to that of the crude rice bran oil, and the oryzanol content in the finished rice bran oil is about 2.3% (23000ppm). (2) Methods of adding natural oryzanol to rice oil: (a) Natural oryzanol is expensive, which greatly increases the processing cost of rice oil (taking the addition of 1% oryzanol as an example, it is equivalent to an increase of 5,000 yuan / ton of rice oil cost); (b) There are potential product quality problems. Rice oil with additional oryzanol is prone to secondary precipitation of oryzanol during storage.

[0007] Therefore, it is very necessary to find a reasonable and effective method for refining rice oil with ultra-high oryzanol content, which can significantly increase the oryzanol content in the finished rice oil, and incidentally increase the content of phytosterols and squalene, increase the nutritional content of rice oil, and ensure that the effect of medicine and food is achieved or close to it under the premise of low fat intake. Summary of the invention:

[0008] The technical problem to be solved by the present invention is to provide a production method of ultra-high oryzanol rice oil. The method can stably produce ultra-high oryzanol rice oil with an oryzanol content of ≥4% (40000ppm), and also has the effect of enriching other beneficial components (phytosterols, squalene). In addition, its physical and chemical indicators, hygiene indicators, and food safety indicators are basically the same as those of conventional refined rice oil, and meet the relevant standards for edible rice oil.

[0009] The technical solution adopted by the present invention is: a method for producing ultra-high oryzanol rice oil, the method comprising the following steps:

[0010] 1. Front-end processing of crude rice bran oil: crude rice bran oil is degummed, dewaxed and decolorized once to obtain primary decolorized oil;

[0011] 2. The primary bleached oil is divided into two parts and used for the following two production routes:

[0012] Route 1: Low-glutamic acid rice oil product route:

[0013] a. After a portion of the primary decolorized oil is preheated in a heat exchanger, it enters a physical deacidification tower for physical deacidification operation, and the temperature of the deacidification tower is controlled at 220°C-225°C, and the vacuum degree is below 150pa, to produce deacidified oil, wherein the free fatty acid content in the deacidified oil is 0.75%-1.0%, and the deacidified oil is produced in a ratio of liquid alkali: deacidified oil = 16-21L: 1t, and liquid alkali with a concentration of 12% is added, mixed by a homogenizer, and then enters a centrifuge for centrifugal separation to obtain a heavy phase: a oryzanol-rich intermediate product; a light phase: a low-oryzanol rice oil intermediate product with a oryzanol content of ≤0.5%;

[0014] b. washing and drying the low-oryzanol rice oil intermediate to obtain the washed and dried oil;

[0015] c. The washed and dried oil is subjected to secondary decolorization, deodorization, winterization and defatting to obtain the finished product low-oryzanol rice oil;

[0016] Route 2: Extra high oryzanol rice oil product route:

[0017] d. After the heavy phase oryzanol-rich intermediate product obtained in step a is metered and mixed with the primary decolorized oil at a dry basis material-liquid ratio of 5% to 10%, the temperature is gradually raised to 60° C.-70° C. under stirring, so that the oryzanol enriched in the oryzanol-rich intermediate product is dissolved back into the rice oil, and then separated by a centrifuge to separate the heavy phase rice bran oil refining byproduct and the light phase extra-high oryzanol rice oil intermediate product;

[0018] e. The intermediate product of extra-high oryzanol rice oil is washed, dried and decolorized twice to obtain the secondary decolorized oil;

[0019] f. The secondary decolorized oil is physically deacidified in a deacidification tower to obtain deacidified oil, in which the free fatty acid content is 0.75% to 1%;

[0020] g. The deacidified oil is deodorized, winterized and defatted to obtain the finished product of ultra-high oryzanol rice oil.

[0021] Furthermore, the degumming process in the step 1 is as follows: the crude rice bran oil is heated to 50-55° C. by a heater, and then pumped into a degumming reactor after metering, phospholipase is added at a feed-oil mass ratio of 40ppm-60ppm, and deionized water is added at a feed-oil mass ratio of 1%-5%, and after retention reaction for 1-2h, the crude rice bran oil is pumped out and heated to 85-90° C. by a heater, and centrifugal degumming is performed to obtain degummed oil.

[0022] Furthermore, the dewaxing process in step one is as follows: the degummed oil obtained by the degumming process of crude rice bran oil is pumped into a dewaxing crystal growing tank, stirred and cooled to 20° C. for crystal growing for 24 hours, filtered to remove the rice bran wax, and obtained dewaxed oil.

[0023] Furthermore, the primary decolorization process in the step 1 is as follows: the dewaxed oil obtained by degumming and dewaxing the crude rice bran oil is heated to 95° C.-100° C., activated white clay is added at a ratio of 3% of the mass ratio of the feed to the liquid, a primary decolorization operation is performed while maintaining a vacuum degree of -0.09Mpa, and the primary decolorized oil is filtered through a closed bottom-discharging filter.

[0024] Furthermore, the washing and drying process in steps b and e is as follows: washing with hot water at 95°C-100°C, then centrifuging, and then vacuum drying at 105°C / -0.09Mpa to obtain the washed and dried oil.

[0025] Furthermore, the secondary decolorization process in steps c and f is as follows: the water-washed and dried oil is subjected to secondary decolorization by adding activated white clay having a feed-liquid mass ratio of 3% at 95°C-100°C and a vacuum degree of -0.09Mpa to obtain secondary decolorized oil.

[0026] Furthermore, the deodorization process in steps c and g is as follows: the secondary decolorized oil is heated to 250°C-255°C and the vacuum degree is below 150 Pa, and the odor and pollutants are removed by deodorization to obtain deodorized oil.

[0027] Furthermore, the winterization and degreasing processes in steps c and g are as follows: the deodorized oil enters the winterization crystal growing tank, is gradually cooled to 0°C, the entire winterization process takes 60 hours, and is filtered and separated at low temperature to obtain finished edible rice oil.

[0028] Furthermore, in step d, another part of the primary bleached oil is measured at a ratio of 5% to 10% of the heavy phase oryzanol-rich intermediate product obtained in step a to the primary bleached oil dry base liquid, pumped into a mixing tank, gradually heated to 60° C.-70° C. under stirring, and maintained for 30 minutes, so that the oryzanol, phytosterol and squalene enriched in the oryzanol-rich intermediate product are dissolved back into the rice oil, and then separated by a centrifuge to separate the heavy phase rice bran oil refining byproduct and the light phase extra-high oryzanol rice oil intermediate product.

[0029] The beneficial effects of the present invention are:

[0030] 1. The method is simple, with low investment and low cost, which is conducive to the application of small and medium-sized enterprises

[0031] The core technology of the present invention is to utilize the difference in solubility of oryzanol under different conditions to enrich the oryzanol in one part of the rice oil into another part of the rice oil, thereby reducing the oryzanol content of one part of the rice oil to increase the oryzanol content of the other part of the rice oil. After subsequent vegetable oil refining processes such as deacidification, deodorization, winterization, and defatting, stable high-oryzanol rice oil and low-oryzanol rice oil that meet the relevant standards of edible rice oil are processed.

[0032] The principle of this technology is simple, and you only need experience in rice oil refining and processing to understand the core technology of this method;

[0033] The application of this technology requires low investment. It only requires adding a stirring and mixing tank to the rice oil refining equipment, stirring and dissolving the intermediate product rich in oryzanol with primary bleaching oil in proportion, and the subsequent process can be carried out according to the rice oil refining process.

[0034] This technology is low-cost and easy to use. All production processes are completed in the refining workshop. There is no need to process the oryzanol-rich intermediates. After direct sampling and testing of moisture and oryzanol content, it can be put into production in proportion without any additional cost.

[0035] 2. Obvious effect, stable product, and wide application

[0036] The present invention can stably produce products with an oryzanol content of more than 40,000 ppm, which is 1-2 times higher than the maximum oryzanol content (16,000 ppm) marked on high-valley rice oil currently on the market. It is equivalent to only taking 1 / 2 or 1 / 3 of the amount of ordinary high-oryzanol rice oil under the same efficacy to achieve the same effect, significantly reducing the daily fat intake, which is in line with the current social advocacy of less oil and less salt diet. (The conventional usage of oryzanol is 100 mg-150 mg / day. Taking 16,000 ppm rice oil as an example, plus the digestion and absorption rate, the daily intake of rice oil is about 10 g to meet the oryzanol demand; when replaced with 40,000 ppm rice oil, only 4 g of rice oil is needed per day.)

[0037] At the same time, the product's extremely high oryzanol content, high phytosterol content, high squalene content and low daily fat intake level allow it to be consumed and added in a variety of ways, such as as health-care rice oil and dietary fortified rice oil.

[0038] 3. One process, two products, increasing product variety

[0039] The present invention can produce two products with different oryzanol specifications within one production cycle, which not only meets the rice bran oil demand in the existing market, but also provides a high-quality new product. At the same time, the cost of the extra-high oryzanol rice bran oil product is low, which improves the market competitiveness of the product. In addition, according to the needs of the market in the later stage, the method can also complete the production and processing of higher oryzanol rice bran oil by adjusting the corresponding ratio. Description of the drawings:

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Figure 1 It is a schematic diagram of the process of the present invention. Specific implementation method:

[0042] The "extra-high oryzanol" in the title of the present invention "a method for producing ultra-high oryzanol rice oil" means that the oryzanol content is ≥40000ppm.

[0043] Embodiment 1:

[0044] like Figure 1 As shown, a method for producing extra-high oryzanol rice oil, the method comprises the following steps:

[0045] 1. Front-end treatment of crude rice bran oil (free fatty acid 10.5%, moisture 0.28%, oryzanol content 1.92%): 150 tons of the crude rice bran oil are put into a degumming reactor, heated to 50-55° C. by a heater, and then metered and pumped into the degumming reactor. Phospholipase is added according to a feed-oil mass ratio of 40ppm-60ppm, and deionized water is added according to a feed-oil mass ratio of 1%-5%. After retention reaction for 1-2h, the crude rice bran oil is pumped out and heated to 85-90° C. by a heater, and centrifugal degumming is performed to obtain degummed oil.

[0046] The degummed oil is pumped into a dewaxing crystal growing tank, stirred and cooled to 20°C for crystal growing for 24 hours, filtered to remove the rice bran wax, and the dewaxed oil is obtained.

[0047] The dewaxed oil was heated to 95°C-100°C, activated clay was added at a ratio of 3% of the mass ratio of the feed to the liquid, and a decolorization operation was performed under a vacuum degree of -0.09Mpa. After filtering through a closed bottom-discharging filter, 132.78 tons of decolorized oil were obtained.

[0048] 2. The primary bleached oil is divided into two parts and used for the following two production routes:

[0049] Route 1: Low-oryzanol rice bran oil product route (oryzanol content ≤ 5000ppm):

[0050] 86 tons of primary decolorized oil are measured, preheated by a heat exchanger, and then enter a physical deacidification tower for physical deacidification. The temperature of the deacidification tower is controlled at 220°C-225°C, and the vacuum degree is below 150pa. The output deacidified oil has an acid value of 1.5-2mg(KOH) / g. Liquid alkali (liquid alkali amount is liquid alkali (12%): deacidified oil = 16-21L: 1t) is added to the output deacidified oil, mixed by a homogenizer, and centrifuged by a centrifuge to obtain a heavy phase: 6.2 tons of oryzanol-rich intermediate product (water content 50.5%, dry basis 40.8%), and a light phase: a low-oryzanol rice oil intermediate product (oryzanol content ≤ 0.5%).

[0051] Light phase: The intermediate product of low-oryzanol rice oil is washed with hot water at 95°C-100°C, centrifuged and vacuum dried to obtain washed and dried oil. The washed and dried oil is decolorized twice by adding activated white clay with a feed-oil mass ratio of 3% at 95°C-100°C and a vacuum degree of -0.09Mpa to obtain secondary decolorized oil. The secondary decolorized oil is deodorized, winterized and defatted to obtain 51.6 tons of finished low-oryzanol rice oil. The test results are acid value 0.07mg(KOH) / g, peroxide value 0.35mmol / kg, oryzanol content 3850ppm, no water content, no residual solvent, no phosphorus content and other indicators are in line with the relevant standards of rice oil.

[0052] Route 2: Extra high oryzanol rice oil product route (oryzanol content ≥ 40000ppm):

[0053] Taking into account the cost and the capacity of the deodorization tower and deacidification tower of the company's production line equipment, they are combined for subsequent refining processing after obtaining credible results.

[0054] 1-1: 3.2 tons of heavy phase: oryzanol-rich intermediate (1.584 tons on dry basis) and 31.68 tons of primary decolorized oil (5% solid-liquid ratio) were pumped into a 50m 3 In a stirring tank, the mixture was gradually heated to 60° C. under stirring and continued to be stirred for 30 minutes. The heavy phase was then separated by a centrifuge to obtain 2.68 tons of rice bran oil refining by-products (53.7% moisture and 3.3% gluten on a dry basis). The light phase was washed with water, centrifuged and vacuum dried to obtain 31.22 tons of ultra-high oryzanol rice oil intermediate (the sampling showed 42000 ppm oryzanol content, 21000 ppm phytosterol and 1220 ppm squalene).

[0055] 1-2: The remaining 3 tons of heavy phase: oryzanol-rich intermediate (1.51 tons on dry basis) and 15.1 tons of primary bleached oil (10% solid-liquid ratio) are pumped into a 50m 3 In a stirring tank, the mixture was gradually heated to 60° C. under stirring and continued to be stirred for 30 minutes. The heavy phase was then separated by a centrifuge to obtain 2.18 tons of rice bran oil refining by-products (50.2% moisture and 6.3% gluten on a dry basis). The light phase was washed with water, centrifuged and vacuum dried to obtain 15 tons of ultra-high oryzanol rice oil intermediates (the sampling showed 57,000 ppm oryzanol content, 23,200 ppm phytosterols and 1,640 ppm squalene).

[0056] Then we combined 46.22 tons of the ultra-high oryzanol rice oil intermediates produced by 1-1 and 1-2, added 3% activated clay by mass at 95°C-100°C and vacuum degree -0.09Mpa, and carried out secondary decolorization to obtain secondary decolorized oil. The secondary decolorized oil was put into a deacidification tower for physical deacidification to obtain deacidified oil, and the deacidified oil was deodorized, winterized, and defatted to obtain 30.6 tons of finished ultra-high oryzanol rice oil. The test results were acid value 0.25mg (KOH) / g, peroxide value 0.33mmol / kg, oryzanol content 48500ppm, phytosterol content 21600ppm, squalene content 1510ppm, no moisture detected, no residual solvent detected, no phosphorus detected, and other indicators all met the relevant standards for rice oil.

[0057] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A method for producing extra high oryzanol rice oil, characterized in that: The steps of this method are as follows:

1. Front-end processing of crude rice bran oil: crude rice bran oil is degummed, dewaxed and decolorized once to obtain primary decolorized oil; 2. The primary bleached oil is divided into two parts and used for the following two production routes: Route 1: Low-glutamic acid rice oil product route: a. After a portion of the primary decolorized oil is preheated in a heat exchanger, it enters a physical deacidification tower for physical deacidification. The temperature of the deacidification tower is controlled at 220°C-225°C and the vacuum degree is below 150pa. Deacidified oil is produced. The free fatty acid content in the deacidified oil is 0.75%-1.0%. The deacidified oil is produced at a ratio of liquid alkali: deacidified oil = 16-21L: 1t. Liquid alkali with a concentration of 12% is added and mixed by a homogenizer. Then, the oil enters a centrifuge for centrifugal separation to obtain a heavy phase: a oryzanol-rich intermediate product; Light phase: low-oryzanol rice oil intermediate with oryzanol content ≤ 0.5%; b. washing and drying the low-oryzanol rice oil intermediate to obtain the washed and dried oil; c. The washed and dried oil is subjected to secondary decolorization, deodorization, winterization and defatting to obtain the finished product low-oryzanol rice oil; Route 2: Extra high oryzanol rice oil product route: d. After the heavy phase oryzanol-rich intermediate product obtained in step a is metered and mixed with the primary decolorized oil at a dry basis material-liquid ratio of 5% to 10%, the temperature is gradually raised to 60° C.-70° C. under stirring, so that the oryzanol enriched in the oryzanol-rich intermediate product is dissolved back into the rice oil, and then separated by a centrifuge to separate the heavy phase rice bran oil refining byproduct and the light phase extra-high oryzanol rice oil intermediate product; e. The intermediate product of extra-high oryzanol rice oil is washed, dried and decolorized twice to obtain the secondary decolorized oil; f. The secondary decolorized oil is physically deacidified in a deacidification tower to obtain deacidified oil, in which the free fatty acid content is 0.75% to 1%; g. The deacidified oil is deodorized, winterized and defatted to obtain the finished product of ultra-high oryzanol rice oil.

2. The method for producing the extra high oryzanol rice oil according to claim 1, wherein: The degumming process in step 1 is as follows: the crude rice bran oil is heated to 50-55° C. by a heater, pumped into a degumming reactor after metering, phospholipase is added at a feed-oil mass ratio of 40ppm-60ppm, deionized water is added at a feed-oil mass ratio of 1%-5%, and after retention reaction for 1-2h, the crude rice bran oil is pumped out and heated to 85-90° C. by a heater, and centrifugal degumming is performed to obtain degummed oil.

3. The method for producing the extra high oryzanol rice oil according to claim 1, wherein: The dewaxing process in step 1 is as follows: the degummed oil obtained by the degumming process of crude rice bran oil is put into a dewaxing crystal growing tank, stirred and cooled to 20° C. for crystal growing for 24 hours, filtered to remove rice bran wax, and dewaxed oil is obtained.

4. The method for producing the extra high oryzanol rice oil according to claim 1, wherein: The primary decolorization process in step 1 is as follows: the dewaxed oil obtained by degumming and dewaxing the crude rice bran oil is heated to 95° C.-100° C., activated clay is added at a ratio of 3% of the mass ratio of the feed to the liquid, a primary decolorization operation is performed under a vacuum degree of -0.09 Mpa, and the primary decolorized oil is filtered through a closed bottom-discharging filter.

5. The method for producing the extra-high oryzanol rice oil according to claim 1, wherein: The washing and drying process in steps b and e is as follows: washing with hot water at 95°C-100°C, then centrifuging, and then drying in a vacuum at 105°C / -0.09Mpa to obtain the washed and dried oil.

6. The method for producing extra high oryzanol rice oil according to claim 1, characterized in that: The secondary decolorization process in steps c and f is as follows: the water-washed and dried oil is subjected to secondary decolorization at 95°C-100°C and vacuum degree -0.09Mpa, and activated white clay with a feed-liquid mass ratio of 3% is added to obtain secondary decolorized oil.

7. The method for producing extra high oryzanol rice oil according to claim 1, characterized in that: The deodorization process in steps c and g is as follows: the secondary decolorized oil is heated to 250° C.-255° C. and the vacuum degree is below 150 Pa, and the odor and pollutants are removed by deodorization to obtain deodorized oil.

8. The method for producing extra high oryzanol rice oil according to claim 1, characterized in that: The winterization and degreasing process in steps c and g is as follows: the deodorized oil enters the winterization crystal growing tank, and is gradually cooled to 0°C. The entire winterization process takes 60 hours, and the oil is filtered and separated at low temperature to obtain the finished edible rice oil.

9. The method for producing extra high oryzanol rice oil according to claim 1, characterized in that: The step d: another part of the primary bleached oil is measured in a ratio of 5% to 10% of the heavy phase oryzanol-rich intermediate product obtained in step a to the primary bleached oil dry base liquid, pumped into a mixing tank, gradually heated to 60° C.-70° C. under stirring, and maintained for 30 minutes, so that the oryzanol, phytosterol and squalene enriched in the oryzanol-rich intermediate product are dissolved back into the rice oil, and then separated by a centrifuge to separate the heavy phase rice bran oil refining byproduct and the light phase extra-high oryzanol rice oil intermediate product.

Images