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Method for extracting ellagic acid tannin from chestnut bur

A chestnut chestnut and ellagic acid technology, applied in the field of extracting ellagic acid tannin, can solve the problems of high tannin content, low tannin purity, heavy metal residue, etc., achieve good safety, low extraction process cost, and high throughput big effect

Inactive Publication Date: 2011-08-03
BEIJING UNIV OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also some heavy metal salt ion precipitation methods (including lead acetate, copper acetate, stannous chloride or alkaline earth metal hydroxide aqueous solution, etc.), ultrasonic reflux auxiliary solvent method, and the tannins extracted by pure solvent method have lower purity and weak activity. ;Heavy metal salt precipitation method will lead to heavy metal residues, poor safety; ultrasonic treatment and water bath reflux assisted preparation of high tannin content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the extraction of ellagic acid tannins

[0029] Air-dry and pulverize the Chinese chestnut pomegranate and pass through a 20-mesh sieve, weigh 10.00g of the chestnut pomegranate powder, and add the chestnut pomegranate powder into ethanol with a mass percentage of 45% in a mass-to-volume ratio of 1:20 (g / ml) In the aqueous solution, mix evenly to obtain the ethanol water dispersion of Lipo powder, ultrasonically extract at 40°C (ultrasonic frequency is 40KHz) for 30min, then reflux in a water bath at 60°C for 2 times, each time for 30min, after each reflux extraction Suction filtration, and re-add the same volume of ethanol water solution (the mass percent content of ethanol is 15%) as the initially added ethanol water solution for extraction, and then suction filtration, and combine the filtrates extracted twice. Utilize the rotary evaporator to concentrate the combined filtrate under reduced pressure, the temperature of the water bath is 50°C, concentrat...

Embodiment 2

[0030] Embodiment 2, the extraction of ellagic acid tannins

[0031]Pass 20 mesh sieves after air-drying and pulverizing the chestnut pods, weigh 10.20g chestnut pod powder, and add the pomegranate pod powder into a 30% ethanol aqueous solution in a mass-volume ratio of 1:20 (g / ml), Mix evenly to obtain the ethanol water dispersion of Lipon powder, ultrasonically extract at 40°C (ultrasonic frequency is 40KHz) for 30min, then reflux in a water bath at 80°C for 2 times, each time for 90min, suction filter after each reflux extraction, Then re-add the same volume of ethanol aqueous solution (the mass percent content of ethanol is 30%) as the initially added ethanol aqueous solution for extraction, then filter with suction, and combine the filtrates extracted twice. Concentrate under reduced pressure using a rotary evaporator, the temperature of the water bath is 50°C, concentrate to a small volume, freeze-dry and freeze-dry (the temperature is -60°C, and the time is 15 hours) wi...

Embodiment 3

[0032] Embodiment 3, the extraction of ellagic acid tannins

[0033] Pass 20 mesh sieves after air-drying and pulverizing the chestnut pods, weigh 10.08g chestnut pod powder, and add the pomegranate pod powder into 45% ethanol aqueous solution in a mass-volume ratio of 1:10 (g / ml), Mix evenly to obtain the ethanol water dispersion of Lipon powder, ultrasonically extract at 40°C (ultrasonic frequency is 40KHz) for 30min, then reflux in a water bath at 80°C for 2 times, each time for 60min, and suction filter after each reflux extraction, Then re-add the same volume of ethanol aqueous solution (the mass percent content of ethanol is 30%) as the initially added ethanol aqueous solution for extraction, then filter with suction, and combine the filtrates extracted twice. Concentrate under reduced pressure using a rotary evaporator, the temperature of the water bath is 50 ° C, concentrate to a small volume, freeze-dry with a freeze dryer (the temperature is -50 ° C, and the time is ...

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Abstract

The invention provides a method for extracting ellagic acid tannin from chestnut bur. The method comprises the following steps of: adding chestnut bur powder into an ethanol aqueous solution to obtain ethanol aqueous dispersion of the chestnut bur; ultrasonically extracting the ethanol aqueous solution, refluxing in a water bath and extracting; and concentrating filtrate to obtain the ellagic acid tannin. The method has the advantages that: (1) the process is simple, the cost is low, the ellagic acid tannin is refined from the ethanol aqueous solution, and the condition is mild; and (2) ethanol is used in the extracting process, and the obtained natural tannin is safe and nontoxic, and is harmless to human bodies.

Description

technical field [0001] The invention relates to a method for extracting ellagic acid tannin from Chinese chestnut pompon. Background technique [0002] Chestnut (Castanea mollissima Blume) belongs to the Fagaceae (Fagacene) plant and is a deciduous tree. In recent years, my country's chestnut industry has developed rapidly. The cultivated area has increased from 700,000 mu in 1989 to 30 million mu in 2009, and the output has also increased from 102,500 tons to 1.08 million tons, accounting for 76.5% of the world's total chestnut production. %, the development prospect is good. At the same time, the amount of chestnut leaves, chestnut bracts, chestnut shells and other wastes produced in the process of chestnut production is also increasing, and the ratio of their production to chestnut nuts reaches 2.5-3:1. Only Chinese patent CN1651550A reports a kind of chestnut shell solid-type charcoal and its preparation method to the development of chestnut chestnut canopy at present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H13/08C07H1/08
Inventor 秦岭张小琴冯永庆杨柳潘叶
Owner BEIJING UNIV OF AGRI
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