Method for extracting chestnut shell tannin through microwave composite technique

A composite technology, chestnut bract technology, applied in chemical instruments and methods, preparation of sugar derivatives, sugar derivatives, etc., can solve the problems of long time required for enzymatic hydrolysis, shortened extraction time, large investment in equipment, etc., to shorten the extraction time , low price and simple equipment

Inactive Publication Date: 2012-08-22
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasonic extraction method uses ultrasonic cavitation to strengthen the extraction process. Compared with conventional extraction methods, no heating is required, the extraction time is shortened, and the yield of tannins is improved. However, there are disadvantages such as large equipment investment and high operating costs.
The enzymatic reaction gently decomposes the plant tissue, which can greatly increase the yield, but the enzymatic hydrolysis takes a long time and the efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Weigh 10.0g of chestnut bract dry powder of 20-80 mesh, add 30ml of 70% ethanol aqueous solution and soak for 20min, and irradiate with microwave with a radiation power density of 56W / g for 1min, and the temperature of the solution after microwave irradiation should not exceed 60°C ;

[0016] (2) Cool the solution to 12°C in a brine bath;

[0017] Repeat the microwave heating-brine bath cooling process 6 times;

[0018] (3) Transfer the microwave-treated chestnut bract solution to a Soxhlet extractor, add 100ml of 70% ethanol-water solution, and reflux for 2 hours;

[0019] (4) Recover ethanol by distillation under reduced pressure, concentrate and dry to obtain chestnut tannin product.

[0020] According to LY / T1642-2005 "Analysis and Test Method for Tannic Acid", the tannin content in the product was analyzed to be 50.42%, and the extraction rate was 27.88%.

Embodiment 2

[0022] (1) Take 12.0g of crushed chestnut buds, add 50ml of methanol aqueous solution with a concentration of 60%, soak for 30min, and irradiate with microwave with a radiation power density of 60W / g for 1min. After microwave irradiation, the temperature of the solution does not exceed 60°C;

[0023] (2) Cool to 15°C with a brine bath;

[0024] The above-mentioned microwave heating-brine cooling operation was repeated 4 times;

[0025] (3) Transfer the chestnut bract solution to a Soxhlet extractor, add 120ml of 60% methanol-water solution, and reflux for 2 hours;

[0026] (4) Recover methanol by distillation under reduced pressure, and evaporate and dry to obtain chestnut tannin product. After analysis, the tannin content of the product is 51.22%, and the extraction rate is 28.66%.

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PUM

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Abstract

The invention relates to a method for extracting chestnut shell tannin through a microwave composite technique. The method comprises the steps of drying and crushing chestnut shells, adding alcohol-water solution for soaking, conducting microwave treatment, irradiating by microwave with radiation power density being 40-70W / g, using saline water for cooling treatment at temperature being lower than 60 DEG C and intermittently operating for 3-9 times; and conducting Soxhlet solvent reflux extraction to materials through a Soxhlet extractor and distilling the obtained extract after extraction under reduced pressure to separate solvent to obtain the chestnut shell tannin product. The method combines techniques of microwave cell wall breaking, cold and hot alternate heating and Soxhlet solvent reflux extraction, the tannin extraction efficiency is obviously improved, the quality is improved, the extraction cost is decreased and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for extracting chestnut bract tannins, in particular to an extraction method for extracting chestnut bract tannins using a composite technology of microwave heating, water bath cooling and Soxhlet solvent reflux extraction. Background technique [0002] Chestnut belongs to Fagaceae Chestnut, which is a kind of arbor economic plant, mainly distributed in temperate and subtropical regions of the northern hemisphere. my country has a history of more than 3,000 years of planting chestnuts. In recent years, the cultivation area and output of chestnuts in my country have increased rapidly, and they are distributed in most areas. The cultivation is concentrated in North China and the Yangtze River Basin. The annual output of chestnuts in my country has exceeded 1 million tons, ranking first. The world's first chestnut, as an economic plant fruit, is rich in starch and is a nut that people like to eat. Chestnut has the effec...

Claims

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Application Information

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IPC IPC(8): C07H13/08C07H1/08
Inventor 秦清徐浩张宗和黄嘉玲杜运平仲崇茂
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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