Method of preparing tea polyphenol by resin adsorption method

A technology of resin adsorption and tea polyphenols, applied in the direction of organic chemistry, can solve the problems of large investment in disposable equipment and unfavorable industrialization promotion, and achieve the effects of improving quality and safety, avoiding organic solvent residues, and saving energy

Active Publication Date: 2006-06-14
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But can use CO 2 It is feasible to remove caffeine from tea polyphenols by SFE method, but the one-time equipment investment of supercritical extraction method is large, which is not conducive to industrialization

Method used

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  • Method of preparing tea polyphenol by resin adsorption method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Extraction

[0044] (1) Selection of raw materials

[0045] The main raw material for the production of tea polyphenols is green tea or green tea powder. %) and hygienic indicators (pesticide residue ≤ 10mg / Kg, heavy metal ≤ 20mg / Kg) to strictly control the quality of raw materials. In particular, it is necessary to strictly control the pesticide residues and heavy metal content in the health indicators. If one of the indicators is unqualified, it cannot be used as a raw material for production.

[0046] (2), leaching coarse filtration

[0047] Put 200kg of green tea into the extraction equipment with heating and stirring device (3000L multifunctional extraction tank), add 2400L of pure water for the first time, close the feeding port, start stirring, open the steam valve, heat to 75-85°C, Stir (rotating speed 20r / min) to extract for 40min, perform second extraction after filtration. For the second extraction, add 1600L of pure water, heat to 75°C, stir and extra...

Embodiment 2

[0063] 1. Extraction

[0064] 1) The selection of raw materials is the same as in Example 1.

[0065] 2), leaching coarse filtration

[0066] Put 200kg of green tea into the extraction equipment with heating and stirring device (3000L multifunctional extraction tank), add 2300L of pure water for the first time, close the feeding port, start stirring, open the steam valve, and heat to 75-85°C , stirring (rotating speed 20r / min) to extract for 40min, after filtering, carry out the second extraction. For the second extraction, add 1700L of pure water, heat to 75°C, stir and extract for 40min, and filter. The filtrate was cooled to 35°C by heat exchange twice, and put into a 4000L extract storage tank (measured solid content=1.34%).

[0067] 2. Centrifugal filtration

[0068] The extract is pumped into a centrifuge at a flow rate of 35L / min at normal temperature and pressure, and continuously centrifuged at 6000r / min to obtain a clarified green tea extract, which is then put i...

Embodiment 3

[0081] Extraction, filtration, polar macroporous resin adsorption decolorization, ultra-high cross-linked adsorption resin decaffeination, nanofiltration concentration, spray drying and packaging in this example are the same as in Examples 1 and 2, except that step 3) The ultrafiltration is to pump the centrifugal green tea clarified liquid into the tubular ultrafiltration equipment at a flow rate of 37L / min for ultrafiltration to remove tea polysaccharides, pectin and other impurities, and the ultrafiltrate is put into a 4000L storage tank. The selected tubular ultrafiltration membrane is a composite membrane with a molecular weight cut off of 20,000. The ultrafiltration process conditions are: room temperature, inlet pressure 6.5bar, outlet pressure 1.5bar. The outlet flow rate of the ultrafiltrate was 26 L / min.

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Abstract

The present method of low-caffeine high-purity tea-polyphenol by using resin adsorption process includes the following steps: using green tea as raw material, adding pure water to make extraction, centrifugal filtering, clarifying to obtain green tea extract, ultrafiltering clear liquor to obtain dialyzate, making the dialyzate be passed through polar macroporous adsorption resin to make adsorption and decolourization, and remove colouring matter impurity to obtain light-yellow effluent, making the light-yellow effluent be passed through ultrahigh cross-linking adsorption resin to make chromatographic adsorption to remove caffeine and obtain tea-polyphenol effluent with low caffeine content, nano-filtering, concentrating, spary-drying so as to obtain the target product tea-polyphenol.

Description

technical field [0001] The invention relates to a tea polyphenol, in particular to a method for preparing low-caffeine high-purity tea polyphenol by using a resin adsorption method. Background technique [0002] Green tea contains about 20% tea polyphenols and 2% to 5% caffeine. Tea polyphenols (GTP) with catechins (EGCG, EGC, ECG, EC, etc.) as the main body can scavenge free radicals in the human body and improve immunity, as well as anti-oxidation, anti-aging, anti-radiation, lowering blood fat, weight loss, and antibacterial Sterilization and other effects. It has been widely used in medicine, health products, oil, cosmetics and food industries. Since catechin has been used as an antioxidant in the food industry, it has been gradually expanded to the fields of medicine and health products, daily cosmetics and fine chemicals. However, high-dose intake of caffeine, another component of tea, can stimulate the central nervous system, increase blood pressure, increase the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D311/04C07D311/30
Inventor 王瑞芳蓝伟光张世文徐昶
Owner SANDA FILM SCI & TECH XIAMEN
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