| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a purified green tea extract, by which the purified green tea extract reduced in impurities such as caffeine, having a reduced bitter taste and an improved hue, and containing non-polymer catechin compounds in a high concentration can be produced, while reducing non-recyclable wastes such as activated carbon. SOLUTION: This method for producing the purified green tea extract containing the non-polymer catechin compounds in a concentration of 25 to 90 mass% based on the solid contents of the green tea extract comprises making a synthetic adsorbent to adsorb a green tea extract, contacting the synthetic adsorbent with a basic aqueous solution to elute the non-polymer catechin compounds, adjusting the pH of the eluted solution to≤7, adjusting the concentration of the non-polymer catechin compounds to 0.1 to 4.0 mass%, filtering the adjusted eluted solution with a fine pore diameter membrane, and then contacting the filtrate with activated carbon. COPYRIGHT: (C)2009,JPO&INPIT
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