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Method for extracting tannin from persimmon

A persimmon and extraction technology, which is applied to chemical instruments and methods, preparation of sugar derivatives, sugar derivatives, etc., can solve the problems of low efficiency, difficulty in implementation, and low purity of tannins, and achieve high purity and high efficiency in the extraction process Effect

Inactive Publication Date: 2019-05-17
GUANGZHOU SHIBIO BIOTECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this prior art, the dissolution and extraction efficiency of persimmon tannin is increased by means of ultrasonic waves. Due to problems such as low efficiency and difficulty in implementation, it is also difficult to guarantee the purity of persimmon tannin in this traditional method.
[0006] Based on this, the present invention provides a kind of method that extracts tannin from persimmon, to solve the low purity of tannin in the tannin extraction process, especially the problem that contains more polysaccharide molecules in the extracted tannin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting tannins from persimmon, including the following steps:

[0034] (1) Take immature and astringent persimmons, clean them, peel them, and mechanically break them;

[0035] (2) High temperature passivation: Add 6 volumes of persimmon pulp to soak the broken persimmon pulp to obtain a mixed solution, where the soaking temperature is 95°, and the soaking duration is 20 minutes;

[0036] (3) Acid extraction treatment: After adding hydrochloric acid to the mixed solution until the pH of the mixed solution is 1.5, let it stand for 20 minutes, filter to obtain the extract, and concentrate the extract, where the volume of the concentrated extract is the original extraction 1 / 4 of liquid volume;

[0037] (4) Alcohol precipitation: add 70% ethanol solution to the concentrated extract at a volume ratio of 1:4, stand for 50 minutes, and filter to obtain the supernatant;

[0038] (5) Esterification treatment: add acetic acid to the supernatant, and keep the pH of the su...

Embodiment 2

[0042] A method for extracting tannins from persimmon, including the following steps:

[0043] (1) Take the immature and astringent persimmons, wash and peel them, then mechanically break them, and then ultrasonic break them;

[0044] (2) High temperature passivation: Add 8 volumes of persimmon pulp to soak the broken persimmon pulp to obtain a mixed solution, where the soaking temperature is 100°, and the soaking duration is 12 minutes;

[0045] (3) Acid extraction treatment: After adding hydrochloric acid to the mixed solution until the pH of the mixed solution is 1.8, let it stand for 15 minutes, filter to obtain the extract, and concentrate the extract; where the volume of the concentrated extract is the original 1 / 3 of the volume of the extract;

[0046] (4) Alcohol precipitation: add 70% ethanol solution to the concentrated extract at a volume ratio of 1:5, stand for 45 minutes, and filter to obtain the supernatant;

[0047] (5) Esterification treatment: Add aerobic acid to the s...

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Abstract

The invention provides a method for extracting tannin from persimmon. The method comprises the steps of washing, peeling, crushing, high temperature passivation, acid extraction treatment, alcohol precipitation, esterification treatment, chelation process and tannin extraction, wherein the esterification treatment process includes adding aerobic acid to a supernatant, keeping the pH of the supernatant at 2.0-3.0 and standing for 20-45 minutes; then adding a chelating ion solution to the supernatant, stirring, standing to precipitate a chelate precipitate, adding the precipitated chelate precipitate to a citric acid solution, precipitating the tannin and conducting nanofiltration membrane desalting treatment on the precipitated tannin to obtain purified tannin after drying. According to themethod, the aerobic acid is added in the supernatant with the main component of tannin to remove the binding between polysaccharide molecules and the tannin, and the chelation between chelate ions and the tannin is utilized to extract the tannin with high purity.

Description

Technical field [0001] The present invention belongs to the technical field of plant extraction, and more specifically, relates to a method for extracting tannins from persimmons by chelation. Background technique [0002] China is a world-renowned persimmon-producing country, and its annual persimmon production accounts for about two-thirds of the world's total production. However, due to the intolerable storage characteristics of persimmons, the period of fresh eating is very short, and the types of other deep-processed products of persimmons are limited, such as partially processed into persimmons with low added value, persimmon wine, beverages, etc., a large number of persimmons are wasted. [0003] my country is the place of origin of persimmons. There are many different varieties, most of which contain more tannins, which makes the unripe persimmons feel obvious astringency when they are imported. Persimmon is a kind of fruit with the highest tannin content, which is more th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H13/08C07H1/08
Inventor 胡洪超舒绪刚许黄文
Owner GUANGZHOU SHIBIO BIOTECH CO LTD