Studies on the Mechanism of the Oxidation of Tea Leaf Catechins

TAKINO Yoshinori, IMAGAWA Hiroshi

doi:10.1271/bbb1961.28.125

Studies on the Mechanism of the Oxidation of Tea Leaf Catechins

DOI 被引用文献2件

TAKINO Yoshinori

Department of Agricultural Chemistry, Faculty of Agriculture, Tokyo University of Education
IMAGAWA Hiroshi

Department of Agricultural Chemistry, Faculty of Agriculture, Tokyo University of Education

書誌事項

タイトル別名

Part IV. Formation of Categallin and Fyrogallin, New Compounds of Benzotropolone Nature Derived form Epigallocatechin

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説明

Oxidations of epigallocatechin in the presence of catechol or pyrogallol with tea oxidase as well as with an oxidizing reagent and the isolation of the oxidation products, categallin (II) and pyrogallin (III), in crystalline form are described. Their absorption spectra are compared with those of pigment P (I) obtained by the oxidation of epigallocatechin and epicatechin, and their structural relationships are discussed.