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Chemical oxidation efficient synthesis method of theasinensins

A polyester catechin, chemical oxidation technology, applied in tea, tea extraction, food science, etc., can solve the problem that the yield does not exceed 30%

Inactive Publication Date: 2019-06-07
TEA RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although enzymatic synthesis has high efficiency, specificity, diversity and mildness, the yield of polyester catechin enzymatic synthesis does not exceed 30%, and more suitable enzyme sources or other synthetic routes still need to be found

Method used

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  • Chemical oxidation efficient synthesis method of theasinensins
  • Chemical oxidation efficient synthesis method of theasinensins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh an appropriate amount of tea polyphenol (catechin) extract, add a methanol solution with a concentration of 35%, and mix well to obtain a tea polyphenol (catechin) raw material solution; add copper chloride chemical catalyst, the addition amount is 40% , the temperature control reaction temperature is 25°C, the time is 50h, and the conversion of catechin to dehydropolyester-type catechin is promoted; vitamin C is added to continue the reaction, the addition amount is 80%, and the temperature is 80°C, and the time is 14min. Under certain conditions, promote the transformation of dehydropolyester-type catechins into polyester-type catechins; use ethyl acetate as the extraction agent, extract twice in equal volume; vacuum rotary evaporation, freeze-drying (or spray-drying) to obtain polyester Type catechin, the yield was 56.5%.

Embodiment 2

[0022] Weigh an appropriate amount of tea polyphenol (catechin) extract, add a 30% ethanol solution, and mix well to obtain a tea polyphenol (catechin) raw material solution; add copper chloride chemical catalyst, the addition amount is 50% , the temperature control reaction temperature is 25°C, and the time is 72h, which promotes the conversion of catechin to dehydropolyester-type catechin; adding vitamin C to continue the reaction, the addition amount is 85%, and the temperature is 85°C, and the time is 18min. Under certain conditions, promote the transformation of dehydropolyester-type catechins into polyester-type catechins; use ethyl acetate as the extraction agent, extract twice in equal volume; vacuum rotary evaporation, freeze-drying (or spray-drying) to obtain polyester Type catechin, the yield was 58.7%.

Embodiment 3

[0024] Weigh an appropriate amount of tea polyphenol (catechin) extract, add a concentration of 25% isopropanol solution, and mix well to obtain a tea polyphenol (catechin) raw material solution; add copper chloride chemical catalyst, the addition amount is 40%, the temperature control reaction temperature is 22°C, and the time is 28h to promote the conversion of catechins to dehydropolyester-type catechins; add vitamin C to continue the reaction, the addition amount is 85%, and the temperature is 85°C, the time is Under the condition of 12min, promote the conversion of dehydropolyester-type catechin to polyester-type catechin; use ethyl acetate as the extractant, extract 3 times in equal volume; vacuum rotary evaporation, freeze-drying (or spray-drying) to obtain The yield of polyester catechin is 52.8%.

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Abstract

The invention discloses a chemical oxidation efficient synthesis method of theasinensins, and belongs to the field of tea deep processing. The method comprises the following steps: 1) preparing a teapolyphenol solution; 2) adding a chemical catalyst for temperature control reaction to promote the conversion of catechin to dehydrogenated theasinensins; 3) adding vitamin C for continuous reaction to promote the conversion of the dehydrogenated theasinensins to the theasinensins; and 4) performing extraction, carrying out vacuum rotary evaporation and concentration, and performing drying to obtain theasinensins. The chemical oxidation efficient synthesis method of the theasinensins is simple and efficient, has the same mild temperature reaction condition as enzymatic oxidation, greatly improves the yield of the theasinensins up to 50-60% finally, and lays a foundation for the research and development application of the physical and chemical characteristics and the application characteristics of the theasinensins.

Description

technical field [0001] The invention belongs to the field of deep processing of tea, in particular to a high-efficiency synthesis method of polyester catechin by chemical oxidation. Background technique [0002] Polyester catechins (Theasinensins, TSs for short) are a class of catechin derivatives formed by the enzymatic oxidation of polyphenols in the process of tea processing. , anti-inflammatory, bactericidal, anti-viral, hypoglycemic, cholesterol-lowering, weight loss and other biological activities and pharmacological functions. At present, the extraction of tea functional components is mostly focused on tea polyphenols, catechins, theanine, theaflavins, etc., and less attention is paid to the extraction and preparation of tea polyester catechins. Tea contains more polyester catechin A (Theasinensins A, TSA for short), polyester catechin B (Theasinensins B, TSB for short), polyester catechin C (Theasinensins C, TSC for short) ). There are two main synthetic methods o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/18A23F3/22A23F3/26A23F3/28
Inventor 张建勇江和源王伟伟陈琳苏威
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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