Method for extracting galla chinensis tannic acid with assistance of radiation pretreatment

A gallic tannic acid and pretreatment technology, which is applied in chemical instruments and methods, preparation of sugar derivatives, sugar derivatives, etc., can solve the problems of small solvent consumption, small follow-up treatment, high equipment requirements, etc., and achieve safety Guaranteed, high-quality, high-yield and high-purity results

Inactive Publication Date: 2013-09-04
HUNAN AGRICULTURAL UNIV
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AI Technical Summary

Problems solved by technology

This method has low solvent consumption, small amount of follow-up treatment, and high extraction rate, but it also requires high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take Galla, first irradiate Co 60 -γ-ray pretreatment, the irradiation dose is 800kGy, the dose rate is 2 kGy / hour, and then leached with distilled water 35 times the mass of gallnut at 90°C for 4.5h, then concentrated at -0.07MPa, 55°C, and finally in Freeze-dry at -0.07MPa and -37°C to obtain tannic acid. The yield of tannic acid was 65.13%, and the purity was 81.36%.

Embodiment 2

[0024] Take Galla, first irradiate Co 60 - Gamma ray pretreatment, the irradiation dose is 400kGy, the dose rate is 2 kGy / hour, and then leached with distilled water 30 times the mass of gallnut at 80°C for 5h, then concentrated at -0.05MPa, 50°C, and finally at - Freeze-dry at 0.05MPa and -35°C to obtain tannic acid. The yield of tannic acid was 63.34%, and the purity was 72.89%.

Embodiment 3

[0026] Take Galla, first irradiate Co 60 - Gamma ray pretreatment, the irradiation dose is 1200kGy, the dose rate is 2 kGy / hour, and then leached with distilled water 40 times the mass of gallnut at 100°C for 4h, then concentrated at -0.09MPa, 60°C, and finally at - Freeze-dry at 0.09MPa and -40°C to obtain tannic acid. The yield of tannic acid is 64.38%, and the purity can reach 81.57%.

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Abstract

The invention relates to a method for extracting galla chinensis tannic acid with the assistance of radiation pretreatment. The method comprises the steps of firstly carrying out radiation pretreatment on galla chinensis, namely a raw material, by adopting Co<60>-gamma rays, and then extracting the galla chinensis tannic acid by adopting a water extraction method. According to the method, the galla chinensis serves as the raw material, and the galla chinensis tannic acid, namely a product, is extracted through the radiation pretreatment of the high-energy Co<60>-gamma rays, so that the yield and purity of the tannic acid are improved in a safe and nontoxic manner; and when the method is applied to industrial production, galla chinensis resources can be utilized more sufficiently, and the high-value utilization and environment-friendly and chemical production of galla chinensis tannic acid resources are embodied sufficiently.

Description

technical field [0001] The invention relates to a method for extracting gallic acid tannic acid, in particular to a method for assisting the extraction of tannic acid by using radiation pretreated gallic acid raw materials to improve the yield and purity of gallic acid. Background technique [0002] Galla chinensis is the leaves of Rhus chinensis Mill., Rhus potaninii Maxim. or Rhus punjabensis Stew.Var.sinica(Diels) Rehd.et Wils. The galls on it are mainly formed by the gall aphid (Melaphis chinensis (Bell) Baker) parasitism. It is recorded in "Chinese Pharmacopoeia" that Galla galla has the effects of astringing the lungs and reducing fire, astringent intestines and diarrhea, dampness and sores, etc. It is used for chronic cough due to lung deficiency, phlegm cough due to lung heat, and chronic diarrhea and dysentery. [0003] Tannic acid (Tannic acid), light yellow to light brown powder at room temperature, has a special smell, very astringent taste, soluble in water, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H13/08C07H1/08
Inventor 肖文军盛达成龚志华杨莉王克勤邓燕莉
Owner HUNAN AGRICULTURAL UNIV
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