Method for extracting pigment from eleochairis toberosa peel

A water chestnut skin and pigment technology, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of unfavorable preservation, complex components, low color scale, etc., to maintain the original biological activity, broad development prospects, The effect of high pigment quality

Active Publication Date: 2017-05-31
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pigment extracted in the existing extraction technology is relatively thick, its composition is complex, its color scale is low, its sugar content is high, and it is easy to mildew, which is not conducive to preservation, and cannot be directly applied. Its biological activity is also reduced due to the own defects of the extraction technology.

Method used

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  • Method for extracting pigment from eleochairis toberosa peel
  • Method for extracting pigment from eleochairis toberosa peel

Examples

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Embodiment 1

[0023] Wash the water chestnut skin, remove dust and impurities on the surface, remove the rotten part, dry it in an oven at 30°C to constant weight, crush it, and pass it through a 40-mesh sieve. Weigh 2g of water chestnut skin, add an appropriate amount of sodium dihydrogen phosphate buffer solution with a solid-liquid ratio of 1:15, add a compound enzyme of cellulase and pectinase with a total mass of water chestnut skin dry powder of 1.2% for enzymolysis, wherein The ratio of cellulase and pectinase was 1:2, stirred and reacted at 55°C and 750rpm for 2h, centrifuged at 7000rpm for 25min, and filtered. Take the water chestnut skin dregs after enzymatic hydrolysis, add a 70% ethanol solution to it, and add according to the mass ratio of water chestnut skin dry powder to liquid: 1:20. Ultrasonic and microwave synergistic extraction is carried out, wherein the extraction conditions are: ultrasonic fixed frequency 40KHz, power 50W, microwave power 250W, and extraction time 90s....

Embodiment 2

[0025] Wash the water chestnut skin, remove dust and impurities on the surface, remove the rotten part, dry it in an oven at 30°C to constant weight, crush it, and pass it through a 40-mesh sieve. Weigh 2g of water chestnut skin, add an appropriate amount of sodium dihydrogen phosphate buffer solution with a solid-liquid ratio of 1:15, add a compound enzyme of cellulase and pectinase with a total mass of water chestnut skin dry powder of 1.2% for enzymolysis, wherein The ratio of cellulase and pectinase is 1:2, stirred and reacted at 50-55°C and 700-850rpm for 1-3h, centrifuged at 7000-8000rpm for 15-25min, and filtered. Take the water chestnut skin dregs after enzymatic hydrolysis, add a 70% ethanol solution to it, and add according to the mass ratio of water chestnut skin dry powder to liquid: 1:20. Ultrasonic and microwave synergistic extraction is carried out, wherein the extraction conditions are: ultrasonic fixed frequency 40KHz, power 50W, microwave power 150W, and extr...

Embodiment 3

[0027] Wash the water chestnut skin, remove dust and impurities on the surface, remove the rotten part, dry it in an oven at 30°C to constant weight, crush it, and pass it through a 40-mesh sieve. Weigh 2g of water chestnut skin, add an appropriate amount of sodium dihydrogen phosphate buffer solution with a solid-liquid ratio of 1:15, add a compound enzyme of cellulase and pectinase with a total mass of water chestnut skin dry powder of 1.2% for enzymolysis, wherein The ratio of cellulase and pectinase is 1:1, stirred and reacted at 50°C and 850pm for 2h, centrifuged at 8000rpm for 15min, and filtered. Take the water chestnut skin dregs after enzymatic hydrolysis, add a 70% ethanol solution to it, and add according to the mass ratio of water chestnut skin dry powder to liquid: 1:20. Ultrasonic and microwave synergistic extraction is carried out, wherein the extraction conditions are: ultrasonic fixed frequency 40KHz, power 50W, microwave power 250W, and extraction time 90s. ...

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Abstract

The invention discloses a method for extracting pigment from eleochairis toberosa peel. The method comprises the following steps: pretreatment; enzymatic hydrolysis: adding a disodium hydrogen phosphate buffer solution into the eleochairis toberosa peel, adding a compound enzyme in an amount which is 0.4 to 2.0 percent of the mass of the eleochairis toberosa peel, stirring for reacting for 1 to 3 hours at the temperature of 50 to 55 DEG C and at the speed of 700 to 850 rpm, and performing centrifugal filtering; adding the eleochairis toberosa peel undergone the enzymatic hydrolysis into an ethanol solution which is 50 to 70 percent in volume fraction, and performing ultrasonic microwave extraction to obtain a pigment product. The extraction method provided by the invention has a high flavone yield, and original bioactivity can be kept to the maximum extent at the same time; extracted flavone pigment has high stability, and high pigment quality; the method has the characteristics of mildness, high efficiency, easiness, convenience, low energy consumption and the like, has greater advantages when being applied to the field of extraction of natural pigment, and has a wide development prospect.

Description

technical field [0001] The invention relates to the technical field of natural pigment extraction, in particular to a method for extracting pigment from water chestnut skin. Background technique [0002] China's horseshoe production accounts for more than 95% of the world's total. my country's annual total processing capacity of water chestnuts exceeds 1 million tons, and water chestnut peels account for about 20% of the total water chestnut quality. The water chestnut skin waste produced every year is more than 200,000 tons, and the resources are very large. Water chestnut skin is rich in natural flavonoid pigments, starch, cellulose, polyphenols, polysaccharides and other ingredients. But water chestnut skin has always been used as feed, or directly discarded, which has caused a waste of resources. Therefore, it is of great significance to extract natural pigments from water chestnut skin and develop and utilize waste resources. As a food additive, natural pigments have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00C09B67/54
CPCC09B61/00C09B67/0096
Inventor 何志勇许亮陈洁曾茂茂秦昉陶冠军张爽王林祥
Owner JIANGNAN UNIV
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