CN102919510A - Preparation method of rice bran selenoprotein powder - Google Patents
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Abstract
The invention relates to the field of selenium-rich rice byproducts, and in particular relates to a preparation method of rice bran selenoprotein powder. The method comprises the following steps of: grinding, screening and degreasing byproduct rice bran obtained after rice processing to prepare rough rice bran into degreased rice bran, mixing 60%-70% alcohol with the degreased rice bran in the material-liquid ratio of (1:3)-(1:5), stirring on a magnetic force mixing machine for a certain period of time, and centrifuging, wherein the processes are repeated for three times; and carrying out alkaline extraction with 0.02-0.1mol/L NaOH solution for 1-3 hours in the material-liquid ratio of (1:10)-(1:20) at the temperature of 30-40 DEG C, taking supernate after centrifuging, decolorizing with active carbon, adjusting an isoelectric point by utilizing a acetic acid-natrium aceticum buffer solution for acid deposition, then centrifuging, and freezing to dry after washing, thereby obtaining the rice bran selenoprotein powder with the protein extraction ratio of 60-80%, and the selenium content of 0.2-0.3mg/kg finally. The selenoprotein powder provided by the invention is natural in nutritional ingredient, is rich in trace element selenium, keeps the original nutrition ingredients in the rice bran selenoprotein powder effectively, and is suitably used as a food auxiliary material or a nutrition enhancer.
Description
One, technical field
The present invention relates to a kind of selenium-enriched rice byproduct manufacture field, particularly a kind of preparation method of rice bran selenoprotein powder belongs to the functional food manufacture field.
Two, background technology
Paddy rice is one of main crops of China, and rice bran then is the significant by-products that produces in the paddy rice process, and China produces rice bran per year more than 1,000 ten thousand tons, and available rice bran resource is quite abundant.Rice bran is mainly as low value-added feed at present, and in fact rice bran is the high added value resource of tool potentiality to be exploited, its protein content is 12%～18%, moreover, also contain dietary fiber, vitamin, oryzanol, mineral matter, phytic acid, protease inhibitors and alpha-amylase inhibitor etc. in the rice bran.Rice bran protein is a kind of vegetable protein with abundant nutrition value and hypoallergenic characteristics, mainly is albumin and globulin, secondly is glutelin and alcohol soluble protein, and soluble protein accounts for 70% in the rice bran, approaches with soybean protein.The essential amino acid of rice bran protein is complete, and amino acid forms the recommendation pattern near FAO/WHO.
Selenium (Selenium, Se) is extensively to distribute in the earth's crust but relatively rare, has been proved to be to be one of essential trace element of animal and human's body.Selenium mainly contains inorganic and organic two kinds of chemical forms in vivo, and inorganic selenium comprises selenides, selenite, selenate etc.; Organic form selenium mainly exists with forms such as seleno-amino acids (Selenoaminoacid) and selenoproteins (Selenoprotein).The many region of China disease occurred frequently, as Keshan disease, Kaschin-Beck disease, cancer, cardiovascular and cerebrovascular disease, diabetes, sterility, immunity of organisms go down with the disease such as aging course all with meals in the selenium picked-up not enough relevant.Selenium also has the special physiological functions such as the heavy metal poisoning of releasing.The nutrition survey result of Chinese Soclety of Nutrition shows, the selenium intake of Chinese Adult every day is 26～32 μ g only, and daily intaking amount 50～200 μ g recommend in Chinese Soclety of Nutrition, and adult selenium intake 60～400 μ g every day recommend in international selenium association.China has 72% to lack selenium or low selenium area, and the selenium that these regional people absorb from local food is often inadequate, therefore, mends selenium and is significant for improving the people ' s health level.At present, by the biological reinforced selenium element of food chain approach, improve scarce selenium crowd selemium nutrition situation, become one of functional food study hotspot.
At present, the main method of extraction rice bran protein has: alkaline process, enzyme process and Physical assisted extraction.Alkaline process is simple, process costs is low; It is gentle that enzyme process prepares the rice bran protein reaction condition, but relative alkaline process, its process costs is higher.The physical treatment process assisted extraction has ultrasonic method, microwave method, high-pressure process and Subcritical Water Extraction method etc.Traditional rice bran protein extracting method is to adopt alkaline process to extract, and also is referred to as chemical method.There are stronger coalescence effect and disulfide bond crosslinking widely in the rice bran between protein component.The principle that alkaline process extracts rice bran protein is that alkali lye can be hydrolyzed hydrogen bond, amido link, the disulfide bond in the rice bran, thereby discharges more protein.
Three, summary of the invention
Technical problem
The preparation method who the purpose of this invention is to provide a kind of rice bran selenoprotein powder, byproduct---the rice bran that has effectively utilized selenium-enriched rice to process can be used for food auxiliary material or nutrition fortifier.
Technical scheme
The method for preparing rice bran selenoprotein powder of the present invention realizes by following steps:
(1) pretreatment of raw material: get fresh selenium-enriched rice bran, grind, cross 80 mesh sieves;
(2) degreasing: use n-hexane, solid-liquid ratio is 1: 3～1: 5, and degreasing twice on magnetic stirring apparatus, and each 3h is centrifugal, and precipitation is placed on an air-dry night in the fume hood.
(3) remove polyphenol: 60%～70% ethanol is mixed (solid-liquid ratio is 1: 3～1: 5) with the defatted rice bran powder and be placed on the magnetic stirring apparatus and stir after a period of time, centrifugal, this process repeats 3 times.Again the precipitation after centrifugal is merged, put into fume hood air-dry night.
(4) alkali is carried: be 0.02～0.1mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1: 10～1: 20,30～40 ℃ of temperature, time 1～3h, alkali carry 2 times, and be centrifugal, merges supernatant.
(5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.02～0.04g/mL stirs 20min under the room temperature.
(6) acid is heavy: the gained protein hydrolyzate is placed on the magnetic stirring apparatus, is adjusted to isoelectric point (4.5～5.0) with NaAc_HAc buffer solution while stirring, treat Precipitation, and centrifugal again, wash 2 times.
(7) freeze-drying: above-mentioned gained protein installed with culture dish put into refrigerator ,-20 ℃ of one nights of lower pre-freeze, second day was put the freeze drier freeze-drying into 24 hours, the valve bag of packing into after the taking-up.
Beneficial effect
(1) the present invention has effectively utilized selenium-enriched rice processed side product---rice bran, not only avoids waste, and has extracted the rice bran selenoprotein with nutritive value.
(2) the present invention is by removing polyphenol and activated carbon decolorizing, the albumen powder that goes out that extracts is measured through color difference meter, L value (whiteness) is 76.6, and be 47.6 without the albumen powder L value of going polyphenol and activated carbon decolorizing step to extract, this shows, polyphenol and the activated carbon decolorizing step of going of the present invention can make the selenoprotein powder have higher acceptability than common albumen powder at color and luster.
(3) Se content is higher than the content of ordinary rice bran albumen powder in the rice bran selenoprotein powder that extracts of the present invention, can be used as nutrition accessory or nutrition fortifier, has higher value.Table 1 is protein and the Se content of ordinary rice bran, selenium-enriched rice bran raw material, albumen powder.
Protein and the Se content of table 1 rice bran product
Four, description of drawings
Fig. 1 is the rice bran selenoprotein powder through past polyphenol and activated carbon decolorizing step; Fig. 2 is the rice bran selenoprotein powder without past polyphenol and activated carbon decolorizing step.
The specific embodiment of invention
Embodiment 1
(1) pretreatment of raw material: obtain brown shorts after same batch of selenium-rich rice milled with hulling machine shelling, rice mill, grind with pulverizer again, cross afterwards 80 mesh sieves.
(2) degreasing: use n-hexane, solid-liquid ratio is 1: 5, and degreasing twice on magnetic stirring apparatus, and each 3h is centrifugal, and precipitation is placed on an air-dry night in the fume hood.
(3) remove polyphenol: 65% ethanol is mixed with the defatted rice bran powder (solid-liquid ratio is 1: 4) be placed on the magnetic stirring apparatus stirred 20 minutes after, centrifugal, this process repeats 3 times.Again the precipitation after centrifugal is merged, put into fume hood air-dry night.
(4) alkali is carried: be 0.08mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1: 10,40 ℃ of temperature, time 3h, alkali carry 2 times, and be centrifugal, merges supernatant.
(5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.04g/mL stirs 20min under the room temperature.
(6) acid is heavy: the gained protein hydrolyzate is placed on the magnetic stirring apparatus, is adjusted to isoelectric point (4.5) with NaAc_HAc buffer solution while stirring, treat Precipitation, and centrifugal again, wash 2 times.
(7) freeze-drying: above-mentioned gained protein installed with culture dish put into refrigerator ,-20 ℃ of one nights of lower pre-freeze, second day was put the freeze drier freeze-drying into 24 hours, the valve bag of packing into after the taking-up.
Embodiment 2
(1) pretreatment of raw material: obtain brown shorts after same batch of selenium-rich rice milled with hulling machine shelling, rice mill, grind with pulverizer again, cross afterwards 80 mesh sieves.
(2) degreasing: use n-hexane, solid-liquid ratio is 1: 5, and degreasing twice on magnetic stirring apparatus, and each 3h is centrifugal, and precipitation is placed on an air-dry night in the fume hood.
(3) remove polyphenol: 65% ethanol is mixed with the defatted rice bran powder (solid-liquid ratio is 1: 4) be placed on the magnetic stirring apparatus stirred 20 minutes after, centrifugal, this process repeats 3 times.Again the precipitation after centrifugal is merged, put into fume hood air-dry night.
(4) alkali is carried: be 0.08mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1: 15,35 ℃ of temperature, time 2h, alkali carry 2 times, and be centrifugal, merges supernatant.
(5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.04g/mL stirs 20min under the room temperature.
(6) acid is heavy: the gained protein hydrolyzate is placed on the magnetic stirring apparatus, is adjusted to isoelectric point (4.5) with NaAc_HAc buffer solution while stirring, treat Precipitation, and centrifugal again, wash 2 times.
(7) freeze-drying: above-mentioned gained protein installed with culture dish put into refrigerator ,-20 ℃ of one nights of lower pre-freeze, second day was put the freeze drier freeze-drying into 24 hours, the valve bag of packing into after the taking-up.
Embodiment 3
(1) pretreatment of raw material: obtain brown shorts after same batch of selenium-rich rice milled with hulling machine shelling, rice mill, grind with pulverizer again, cross afterwards 80 mesh sieves.
(2) degreasing: use n-hexane, solid-liquid ratio is 1: 5, and degreasing twice on magnetic stirring apparatus, and each 3h is centrifugal, and precipitation is placed on an air-dry night in the fume hood.
(3) remove polyphenol: 65% ethanol is mixed with the defatted rice bran powder (solid-liquid ratio is 1: 4) be placed on the magnetic stirring apparatus stirred 20 minutes after, centrifugal, this process repeats 3 times.Again the precipitation after centrifugal is merged, put into fume hood air-dry night.
(4) alkali is carried: be 0.02mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1: 20,40 ℃ of temperature, time 2h, alkali carry 2 times, and be centrifugal, merges supernatant.
(5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.04g/mL stirs 20min under the room temperature.
(6) acid is heavy: the gained protein hydrolyzate is placed on the magnetic stirring apparatus, is adjusted to isoelectric point (4.5) with NaAc_HAc buffer solution while stirring, treat Precipitation, and centrifugal again, wash 2 times.
(7) freeze-drying: above-mentioned gained protein installed with culture dish put into refrigerator ,-20 ℃ of one nights of lower pre-freeze, second day was put the freeze drier freeze-drying into 24 hours, the valve bag of packing into after the taking-up.
Claims (5)
1. the preparation method of a rice bran selenoprotein powder is characterized in that comprising the steps and process conditions:
(1) pretreatment of raw material: get fresh selenium-enriched rice bran, grind, cross 80 mesh sieves;
(2) degreasing: use n-hexane, solid-liquid ratio is 1: 3～1: 5, in the upper degreasing twice of magnetic stirring apparatus (79-1, Changzhou Guohua Electric Appliance Co., Ltd.), and each 3h, centrifugal, precipitation is placed on an air-dry night in the fume hood;
(3) remove polyphenol: 60%～70% ethanol is mixed (solid-liquid ratio is 1: 3～1: 5) with the defatted rice bran powder and be placed on the magnetic stirring apparatus and stir after a period of time, centrifugal, this process repeats 3 times.Again the precipitation after centrifugal is merged, put into fume hood air-dry night;
(4) alkali is carried: be 0.02～0.1mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1: 10～1: 20,30～40 ℃ of temperature, time 1～3h, alkali carry 2 times, and be centrifugal, merges supernatant;
(5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.02～0.04g/mL stirs 20min under the room temperature;
(6) acid is heavy: the gained protein hydrolyzate is placed on the magnetic stirring apparatus, is adjusted to isoelectric point (4.5～5.0) with NaAc_HAc buffer solution while stirring, treat Precipitation, and centrifugal again, wash 2 times;
(7) freeze-drying: above-mentioned gained protein installed with culture dish put into refrigerator ,-20 ℃ of one nights of lower pre-freeze, second day was put the freeze drier freeze-drying into 24 hours, the valve bag of packing into after the taking-up.
2. rice bran selenoprotein powder, preparation method thereof according to claim 1, it is characterized in that (2) degreasing: use n-hexane, solid-liquid ratio is 1: 3～1: 5, and degreasing twice on magnetic stirring apparatus, each 3h is centrifugal, and precipitation is placed on an air-dry night in the fume hood.
3. rice bran selenoprotein powder, preparation method thereof according to claim 1, it is characterized in that (3) remove polyphenol: 60%～70% ethanol mixes (solid-liquid ratio is 1: 3～1: 5) with the defatted rice bran powder.
4. rice bran selenoprotein powder, preparation method thereof according to claim 1 is characterized in that (4) alkali carries: be 0.02～0.1mol/L with the defatted rice bran powder with NaOH concentration, and solid-liquid ratio 1:10～1:20,30～40 ℃ of temperature, time 1～3h.
5. rice bran selenoprotein powder, preparation method thereof according to claim 1 is characterized in that (5) decolouring: add active carbon in the supernatant of above-mentioned gained, consumption 0.02～0.04g/mL.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103393103A (en) * | 2013-07-10 | 2013-11-20 | 南京财经大学 | Rice bran selenoprotein and soyabean protein compound capsule |
| CN103461646A (en) * | 2013-09-29 | 2013-12-25 | 东北农业大学 | Method suitable for removing arsenic from rice bran |
| CN103564144A (en) * | 2013-10-29 | 2014-02-12 | 汪兴东 | Method for preparing low-fat protein powder |
| CN105638914A (en) * | 2016-02-15 | 2016-06-08 | 安东顺 | High selenium-enriched total nutrient instant soybean milk powder and preparation method thereof |
| CN105725117A (en) * | 2016-02-15 | 2016-07-06 | 安永顺 | Processing method for selenium-rich baijiu-saturated dates |
| CN106036883A (en) * | 2016-06-01 | 2016-10-26 | 南京财经大学 | Toxicity-removing composite tablets containing selenoprotein and glossy ganoderma components and preparation method of toxicity-removing composite tablets |
| CN106135633A (en) * | 2016-07-01 | 2016-11-23 | 河南工业大学 | A kind of food-borne selenium-rich anti-oxidation peptide and preparation method thereof |
| CN106720917A (en) * | 2017-01-13 | 2017-05-31 | 四川农业大学 | A kind of method that selenoprotein is extracted in the chaff from selenium-rich rice |
| CN107050325A (en) * | 2017-02-15 | 2017-08-18 | 江苏食品药品职业技术学院 | The extracting method of polyphenol substance in a kind of defatted rice bran |
| CN107319264A (en) * | 2017-05-09 | 2017-11-07 | 湖北工业大学 | A kind of process of fresh rice bran stabilization processes |
| CN107353321A (en) * | 2017-08-11 | 2017-11-17 | 广西壮族自治区农业科学院农业资源与环境研究所 | A kind of method that plant selenoprotein is extracted from selenium-rich rice |
| CN111763701A (en) * | 2020-07-16 | 2020-10-13 | 陕西科技大学 | Method for extracting organic selenium from natural selenium-rich agricultural products step by step |
| CN113105289A (en) * | 2021-04-13 | 2021-07-13 | 安徽珍硒农业科技有限责任公司 | Selenium-rich organic nutrient solution for fruit crop cultivation and preparation method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103393103A (en) * | 2013-07-10 | 2013-11-20 | 南京财经大学 | Rice bran selenoprotein and soyabean protein compound capsule |
| CN103393103B (en) * | 2013-07-10 | 2015-04-29 | 南京财经大学 | Rice bran selenoprotein and soyabean protein compound capsule |
| CN103461646A (en) * | 2013-09-29 | 2013-12-25 | 东北农业大学 | Method suitable for removing arsenic from rice bran |
| CN103564144A (en) * | 2013-10-29 | 2014-02-12 | 汪兴东 | Method for preparing low-fat protein powder |
| CN105638914A (en) * | 2016-02-15 | 2016-06-08 | 安东顺 | High selenium-enriched total nutrient instant soybean milk powder and preparation method thereof |
| CN105725117A (en) * | 2016-02-15 | 2016-07-06 | 安永顺 | Processing method for selenium-rich baijiu-saturated dates |
| CN106036883A (en) * | 2016-06-01 | 2016-10-26 | 南京财经大学 | Toxicity-removing composite tablets containing selenoprotein and glossy ganoderma components and preparation method of toxicity-removing composite tablets |
| CN106135633A (en) * | 2016-07-01 | 2016-11-23 | 河南工业大学 | A kind of food-borne selenium-rich anti-oxidation peptide and preparation method thereof |
| CN106720917A (en) * | 2017-01-13 | 2017-05-31 | 四川农业大学 | A kind of method that selenoprotein is extracted in the chaff from selenium-rich rice |
| CN107050325A (en) * | 2017-02-15 | 2017-08-18 | 江苏食品药品职业技术学院 | The extracting method of polyphenol substance in a kind of defatted rice bran |
| CN107319264A (en) * | 2017-05-09 | 2017-11-07 | 湖北工业大学 | A kind of process of fresh rice bran stabilization processes |
| CN107353321A (en) * | 2017-08-11 | 2017-11-17 | 广西壮族自治区农业科学院农业资源与环境研究所 | A kind of method that plant selenoprotein is extracted from selenium-rich rice |
| CN107353321B (en) * | 2017-08-11 | 2019-07-05 | 广西壮族自治区农业科学院农业资源与环境研究所 | A method of extracting plant selenoprotein from selenium-rich rice |
| CN111763701A (en) * | 2020-07-16 | 2020-10-13 | 陕西科技大学 | Method for extracting organic selenium from natural selenium-rich agricultural products step by step |
| CN113105289A (en) * | 2021-04-13 | 2021-07-13 | 安徽珍硒农业科技有限责任公司 | Selenium-rich organic nutrient solution for fruit crop cultivation and preparation method thereof |
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