Process for extracting tea polyphenol in tea

Abstract

The invention relates to an extraction process for tea polyphenol in tea, which comprises the following steps that: (1) fresh leaves of the tea are subjected to steam fixation to obtain fixed leaves; and (2) the fixed leaves are leached and then are filtered, a filtrate is separated through a reverse osmosis membrane to obtain a concentrated solution, and the concentrated solution is spray dried to obtain a tea polyphenol product. Further the filtration in step (2) comprises the following steps that: the coarse filtration is performed first, then the ultrafiltration is performed, an ultrafiltration permeation liquid is separated through the reverse osmosis membrane, and an ultrafiltration concentrated solution is separated or dried to obtain a byproduct. The extraction process can reduce the loss of the tea polyphenol in a raw material by using steam to fix green leaves, and the separation of the concentrated solution by adopting reverse osmosis membrane separation technology has the characteristics of high energy efficiency, low investment cost, continuous operation, large separation ability and the like.

Description

(1) Technical field [0001] The invention relates to a process for extracting tea polyphenols from tea leaves. (2) Background technology [0002] Tea Polyphenols is the general term for polyphenols in tea, including flavanols, anthocyanins, flavonoids, flavonols and phenolic acids. Among them, flavanols (catechins) are the most important. Tea polyphenols, also known as tea tanning or tea tannins, are one of the main components that form the color and aroma of tea, and are also one of the main components that have health care functions in tea. Herbal Chiba IT tea is rich in tea polyphenols (scientific name Camellia sinensis). Scientists such as Professor Yamashita Teide from Chiba University in Japan have shown that active substances such as tea polyphenols have detoxification and anti-radiation effects, can effectively prevent radioactive substances from invading bone marrow, and can quickly excrete strontium 90 and cobalt 60 from the body. Known as the "radiation nemesis"...

AI Technical Summary

Problems solved by technology

The production cost of this method is high, and it is easy to cause pollution

[0005] 2. The ion precipitation method uses metals to precipitate tea polyphenols to separate them from caffeine. This method uses heavy metals that are toxic to the human body as a precipitant. Therefore, the products produced by this method are difficult to meet the requirements of the food and pharmaceutical industries.

Studies have shown that the yield of tea polyphenols is between 4% and 8% and the purity can reach 98% by using the column separation preparation method, but the column packing material is very expensive, and many kinds and a large amount of organic solvents are used for rinsing. Not suitable for industrial production

The above traditional methods generally have some problems and disadvantages, and the products cannot fully meet the requirements of the food additives and pharmaceutical industries in terms of safety, price and purity

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