Kao Corporation

Tomoko Konishi

Susumu Ohishi

Norihiko Satake

Shinichiro Takashima

Koichi Funada

A polyphenol composition derived fromand contains flavonol aglycones and flavonol glycosides, in a weight ratio [(B)/(A)] of the following total contents (B) to (A) is from 0.01 to 18, wherein (A) total content of the flavonol aglycones contained in solids of the polyphenol composition after hydrolysis as measured by high-performance liquid chromatography, and (B) total content of the polyphenols contained in solids of the polyphenol composition as measured by the ferrous tartrate method.

Polyphenol composition

A purified green tea extract is improved in bitterness and aftertaste. The purified green tea extract, which comprises satisfying the following conditions:

Purified green tea extract

An object is to provide a preparation process of a green tea extract having a high non-polymer catechin concentration and tasting good with less bitterness and less astringency. The present invention relates to a preparation process of a green tea extract, which comprises subjecting an enzyme-inactivated raw tea leaves to CTC processing, drying the tea leaves until the water content thereof becomes 20 wt. % or less, and extracting the tea leaves while setting the weight ratio of an extraction solvent to the tea leaves to be extracted to 30 or less.

Growing community of inventors

Sumida-ku, Japan

Tomoko Konishi