Method for extracting black rice anthocyanins
An extraction method and technology of black rice flower, which are applied in chemical instruments and methods, preparation of sugar derivatives, sugar derivatives, etc., can solve problems such as cost and limited promotion, and achieve the effects of short time consumption, low cost and easy operation.
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Embodiment 1
[0021] Example 1 A kind of extraction process of anthocyanins in black rice
[0022] 1. Select black japonica rice with dark outer covering and pass through a 40-mesh sieve through a rice mill to make black rice flour. The purpose is to peel off the surface layer of black rice rich in anthocyanins and the black rice core, and also improve its contact with solvents. area.
[0023] 2. Weigh a certain amount of black rice flour, add petroleum ether, the ratio of solid to liquid is 1:5, heat and reflux for leaching for 60 minutes, and drain the petroleum ether part to remove fat-soluble impurities.
[0024] 3. Then use distilled water (ethanol concentration is 0), solid-liquid ratio 1:5, leaching for 60min, and drain the water part to remove water-soluble impurities.
[0025] 4. Use 90% ethanol (high-concentration ethanol) again, with a solid-to-liquid ratio of 1:5, and extract for 60 minutes, drain the ethanol part, and remove alcohol-soluble impurities.
[0026] 5. Use 10% eth...
Embodiment 2
[0030] Embodiment 2 Conventional method (Ye Xinchao method)
[0031] 1. Black brown rice was extracted for 1 day with the extraction solution, filtered, repeated twice, and the extraction solution was combined 3 times to remove the pigmented brown rice;
[0032] 2. The extract is distilled under reduced pressure, and the extract is recovered to obtain the paste-like black rice pigment;
[0033] 3. Add petroleum ether to reflux, extract for 1 hour, remove fatty petroleum ether, and recover petroleum ether at the same time;
[0034] 4. Redissolve the black rice pigment with methanol, filter to remove the insoluble methanol;
[0035] 5. Pigment methanol solution, distilled under reduced pressure to obtain black rice pigment, and dried at 80°C to obtain black rice pigment.
Embodiment 3
[0036] Example 3 Production according to 200510049274.0 patent
[0037] The method for extracting anthocyanins from black rice disclosed in the patent application number 200510049274.0 is used for production.
[0038] 1. Using brown rice grains of black rice as raw materials, after selecting and removing impurities, use cellulase to enzymolyze the surface layer of black brown rice grains, so that anthocyanins can be easily separated;
[0039] 2. Then use 90-95% ethanol to extract and terminate the enzymatic hydrolysis reaction, and drain the alcohol-soluble impurities;
[0040] 3. Extract the black brown rice grains after enzymatic hydrolysis and removal of alcohol-soluble impurities with 45-55% ethanol;
[0041] 4. removing ethanol from the extracted solution under reduced pressure, and spray-drying the extracted solution after removing ethanol to form black rice anthocyanin powder.
[0042] Result comparison
[0043] The anthocyanins extracted from Examples 1, 2 and 3 wer...
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