EXTRACTION OF GREEN TEA USING CARBON DIOXIDE AT SUPERCRITICAL CONDITIONS TO PREVENT CHEMICAL DENATURATION OF GREEN EXTRACT AND LEAVING NO SOLVENT

摘要

Purpose: the present invention provides a kind of methods for by using carbon dioxide draw green tea (arbor-vitae orientalis) in supercritical condition. The extract of green tea is obtained in a higher yield, its denaturation is prevented from, and extraction solvent does not remain. Extract does not harm flesh and blood. Construction: the cosolvent in 1 volume ratio, the leaf of green tea are rolled and mix: 0.01 to 1: 10 and 31 arrive 90deg.C and 71 is to 800atm carbon dioxide draws. Cosolvent selects methanol, ethyl alcohol, ethylene glycol, propylene glycol, 1,3-BDO, glycerol, phytosqualan and its mixture in being selected from the group. One cosmetic composition contains by green-tea extract weight 0.001 to 50%.