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Method for simultaneously extracting polyphenol and hemicellulose in grape pips

A technology of hemicellulose and grape seeds is applied in the field of comprehensive utilization of plant resources, which can solve the problems of waste of resources and environmental pollution, and achieve the effects of saving time, improving extraction efficiency and saving energy investment.

Inactive Publication Date: 2016-01-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This wastes resources and causes environmental pollution

Method used

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  • Method for simultaneously extracting polyphenol and hemicellulose in grape pips
  • Method for simultaneously extracting polyphenol and hemicellulose in grape pips
  • Method for simultaneously extracting polyphenol and hemicellulose in grape pips

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Extraction of polyphenols from grape seeds:

[0016] 1) Grape seeds are crushed to 40 meshes, and lipids are removed by petroleum ether;

[0017] 2) Weigh 10g of grape seed powder and place it in a double-necked flask, and add a mass fraction of 60% ethanol aqueous solution according to 1:15 (w / v);

[0018] 3) Polyphenols were extracted by incubating in a water bath at 60°C for 2 hours, centrifuged after the extraction was completed, and the supernatant was freeze-dried to obtain the polyphenols extract.

[0019] 4) Determination of polyphenol content and its antioxidant activity.

[0020]

Embodiment 2

[0022] Extraction of hemicellulose from grape seeds:

[0023] 1) Grape seeds are crushed to 40 meshes, and lipids are removed by petroleum ether;

[0024] 2) Weigh 10 g of grape seed powder and place it in a double-necked flask, and add 8% NaOH solution with a mass fraction of 1:15 (w / v) according to the solid-to-liquid ratio;

[0025] 3) Incubate in a water bath at 90°C for 2 hours to extract polyphenols, centrifuge after the extraction is completed, and take the supernatant;

[0026] 4) Use concentrated hydrochloric acid to adjust the pH of the supernatant to 5, add three times the volume of ethanol with a mass fraction of 95%, ethanol precipitation for 2 hours, retain the supernatant obtained by centrifugation, and vacuum-dry the precipitate to obtain the extracted hemifiber white;

[0027]

Embodiment 3

[0029] Extraction of polyphenols and hemicellulose from grape seeds by microwave pretreatment:

[0030] 1) The rose honey grape seed is crushed to 40 mesh, and the lipid is removed by petroleum ether;

[0031] 2) Weigh 10g of grape seed powder and place it in a blue cap bottle, add 8% NaOH solution with a mass fraction of 1:25 (w / v);

[0032] 3) Place the double-necked flask into which the raw material and the solution are placed in the microwave chemical reactor, and connect the air condenser and the temperature sensor from the two bottlenecks respectively;

[0033] 4) Adjust the microwave power, and control the system temperature to react at 110°C for 60s;

[0034] 5) Take out the double-necked flask and put it directly into a 60°C water bath, extract for 2 hours, centrifuge after the extraction is completed, and take the supernatant;

[0035] 6) Use concentrated hydrochloric acid to adjust the pH of the supernatant to 5, add three times the volume of ethanol with a mass f...

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Abstract

The invention discloses a method for simultaneously extracting polyphenol and hemicellulose in grape pips. The method comprises the following basic steps: firstly smashing and degreasing the grape pips; carrying out microwave pretreatment before extraction; using aqueous alkali to extract the polyphenol and hemicellulose in the degreased grape pips; and separating the polyphenol and hemicellulose in an extracting solution. According to the method, the two substances in the grape pips can be extracted simultaneously, the extraction process is shortened, and the energy investment is reduced.

Description

technical field [0001] The invention belongs to the technology of comprehensive utilization of plant resources, in particular to a method for extracting polyphenols and hemicellulose in grape seeds. Background technique [0002] With the development of society and the advancement of science and technology, resource crisis and environmental pollution are two major problems faced by modern society, and waste utilization is an important means to alleviate these two problems. The comprehensive utilization of waste resources has become a research hotspot all over the world. [0003] Grape seed is a by-product of wine and beverage industry processing, rich in oil, polyphenols, cellulose, lignin, hemicellulose and other resources. At present, the comprehensive utilization of grape seeds is mainly based on oil extraction and grape polyphenol extraction. Due to the complex composition of grape seeds, and the extraction of different components requires different processes, after the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00C08B37/14C07D311/62
Inventor 徐建李宏强李曌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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