Kikkoman Corporation

Yasuhiko Imai

Nobuyuki Yamaji

Masaru Suzuki

Shigehiro Kataoka

Shoichi Tokutake

Tetsuya Oguma

Kiyoshi Mizusawa

Katsumi Yuasa

Hirokazu Koyama

According to this invention are provided a method for determining an exo-type saccharide hydrolase activity which comprises adding to a sample a .beta.-maltoside derivative represented by the general formula ##STR1## wherein R is a chromophoric organic group, as a substrate, conducting reaction in the presence of a coupled enzyme, and optically determining the substance liberated, and a method for differentially determining glucoamylase and .alpha.-glucosidase activities which comprises adding, to a sample, the above .beta.-maltoside derivative as the first substrate and a coupled enzyme, and an .alpha.-glucoside derivative represented by the general formula ##STR2## wherein R' is a chromophoric organic group, as the second substrate, subjecting the mixtures to separate enzymatic reactions, and then optically quantitatively determine the substances liberated.

Method and reagent for determinng exo-type saccharide hydrolase activity

A process for producing ellagic acid comprising reacting a tannin having gallic acid residues attached as constituents with an oxidizing agent at pH 7 or higher.

Process for producing ellagic acid

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Noda, Japan

Yasuhiko Imai