Process for extracting tea polyphenol, theanine, tea polysaccharide and tea pigment from tea

Abstract

The invention discloses an extracting polyphenol, theanine, tea polysaccharide and tea pigment method from tea, which is characterized by the following: using deionized water for lixiviating tea at constant temperature with continuous flow upstream at multi-speed; adopting microstrainer to dislodge the foreign matter of raffinate; using hyperfiltration for putting-off pectin and protein; concentrating by hyperfiltration and dehydration; extracting tea polyphenol by acetic acid ethyl ester and recovering dissolvant; stripping caffeine of extracting extract phase, pesticide residue and dissolvant by CO2 supercritical fluid; getting tea polyphenol by low-temperature nitrogen spray-drying; using alcohol separation and low temperation vacuum drying by hyperfiltration trapped fluid to prepare tea polysaccharide; separating alcohol recrystallization by basic copper carbonate and hydrogen sulfide to get theanine; using enzymatic oxidation and alkaline air to oxygenate remain polyphenols substance of liquid phantom; getting tea pigment by hyperfiltration dehydration compression and vacuum drying; merging caffeine form carbon dioxide above-critical fluid and caffeine from carrene; recovering dissolvent; using deionized water for washing; obtaining caffeine by recrystallization vacuum drying.

Description

Technical field [0001] The invention discloses a method for extracting tea polyphenols, theanine, tea polysaccharides and tea pigments from tea leaves. Background technique [0002] Domestic and foreign scientific research has proven that tea polyphenols have the functions of scavenging free radicals in the human body and improving immunity, antioxidant, anti-aging, anti-radiation, anti-cancer and lowering blood lipids; theanine has the functions of lowering blood pressure, calming the nerves and improving sleep; tea Polysaccharides have the functions of lowering blood sugar and enhancing immunity; tea pigments have the functions of anti-coagulation, anti-thrombosis and preventing atherosclerosis; caffeine has the functions of treating asthma and eliminating fatigue. Therefore, the functional ingredients of tea have been widely used in medicine, health care, food and other fields, and have a huge potential market. Comprehensive development of functional components of tea is...

AI Technical Summary

Problems solved by technology

[0003] According to public patent reports at home and abroad, the methods for extracting functional components such as tea polyphenols from tea include ion precipitation, solvent extraction, resin adsorption and carbon dioxide supercritical fluid extraction, but there is no solvent extraction technology, resin A one-time method for extracting tea polyphenols, theanine, tea polysaccharides, tea pigments, and caffeine from tea leaves by combining advanced technologies and equipment such as adsorption technology, membrane separation technology, enzymatic oxidation technology, and carbon dioxide supercritical fluid extraction technology

The tea polyphenol extraction method of my published patent CN1104621 has the defect of high tea polyphenol purity but low yield; my published patent No. 03149378.5 and the tea polyphenol extraction method of the published patent CN03135467.X still have the problem that tea resources have not been fully utilized. defect

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