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Method for extracting plant polyphenol from walnut shells by using ionic liquid

A technology of ionic liquid and hickory shell, which is applied in the direction of organic chemistry to achieve the effect of improving the extraction effect

Inactive Publication Date: 2013-01-09
河北奥贝斯食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, we are devoting ourselves to the research of green chemistry and clean production technology, therefore, in the present invention, utilize amides ionic liquid to study the method for extracting plant polyphenolic compounds as extractant, this is a green chemical technology, Not yet reported

Method used

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  • Method for extracting plant polyphenol from walnut shells by using ionic liquid
  • Method for extracting plant polyphenol from walnut shells by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the hickory nut shell that has been cleaned to remove impurities, dry it at 25~30°C, and grind it to make hickory nut shell powder. Take 10 grams of hickory nut shell powder and put it into a 50 ml conical flask, add 1,3-di (N-Phenylcarbamoylethyl) imidazole hexafluorophosphate ionic liquid 10 grams, heated at 110 ° C, stirring and leaching for 20 hours, after the reaction, add 10 x 3 ml of toluene to the reaction mixture while it is hot, filter, and filter residue It is the extracted pecan shell powder, the filtrate is washed with 10x3 ml of distilled water, left to stand for stratification, the concentrated solution obtained after the toluene layer is rotary evaporated to remove the toluene is the amide ionic liquid recovery, and the water layer is the plant polyphenol extract , the mass content of plant polyphenols in the plant polyphenol extract was determined to be 45.1% by complexometric titration.

Embodiment 2

[0024] The ionic liquid was changed to 1,3-bis(N-p-nitrophenylcarbamoylethyl) imidazole hexafluorophosphate 100g, heated at 100°C, stirred and extracted for 5 hours, other operations were the same as in Example 1, and complexed The mass content of plant polyphenols in plant polyphenol extract was determined by titration method to be 44.8%.

Embodiment 3

[0026] The ionic liquid was changed to 30 g of 1,3-bis(N-p-methoxyphenylcarbamoylethyl) imidazole hexafluorophosphate, heated at 150° C., stirred and extracted for 10 hours, and the other operations were the same as in Example 1, using a network The mass content of plant polyphenols in the plant polyphenol extract was determined by titration method to be 45.8%.

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Abstract

The invention discloses a method for extracting plant polyphenol from walnut shells by using an ionic liquid. The method comprises the following steps of: mixing pretreated walnut shell powder serving as a raw material and an amide ionic liquid, which is shown as a formula (I) and serves as an extracting agent, in the mass ratio of (1-10):1; heating to 50-200 DEG C; after stirring and extracting completely, adding toluene into a reaction mixed solution while the solution is hot; filtering for removing filter residues; washing a filtrate with water; standing for delaminating; and rotationally evaporating a toluene layer for removing toluene to obtain a concentrated solution, i.e., an amide ionic liquid for recycling, wherein a water layer is a plant polyphenol extracting solution. In the method, the amide ionic liquid is taken as an extracting agent for extracting a plant polyphenol compound, so that the extracting effect is improved; the ionic liquid can be used circularly; and the method is safe, stable and environment-friendly, and is an economic, practical and environment-friendly technology.

Description

(1) Technical field [0001] The invention relates to the extraction of plant polyphenols, in particular to a method for extracting plant polyphenols from pecan shells by using ionic liquids. (2) Background technology [0002] Plant polyphenol (plant polyphenol), also known as vegetable tannin or tannin, is a secondary metabolite of plants, composed of gallic acid (or its polymers) glucose (and its polyols) alcohols, flavonoids Polymers of alkanol and its derivatives and the mixture of the two together form plant polyphenols. As early as 1920, Frendedrberg classified tannins into two categories according to their chemical structure: hydrolyzed tannins and condensed tannins. Hydrolyzed tannins can be further divided into gallotannins (which produce gallic acid after hydrolysis), ellagitannins (which produce acid ellagitannins after hydrolysis); condensed tannins (polyflavanol polyphenols) can be classified according to their molecular weight. Divided into monomers and polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00
Inventor 方苗利孙莉裴文
Owner 河北奥贝斯食品有限公司