Analytical Evidence for the Presence of Triglycosidic Pattern in Violanin. Studies on Anthocyanins, XL

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  • TAKEDA Kosaku
    Botanical Institute, Faculty of Science, Tokyo University of Education
  • HAYASHI Kozo
    Botanical Institute, Faculty of Science, Tokyo University of Education

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  • ビオラニンが三糖配糖体であることの実験的根拠 (アントシアニンの研究 第40報)
  • ビオラニンが三糖体であることの実験的根拠(アントシアニンの研究)〔英文〕-40-
  • ビオラニン ガ サン トウタイ デ アル コト ノ ジッケンテキ コンキョ アントシアニン ノ ケンキュウ エイブン 40

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Abstract

The present experiments have shown that the original specimen of violanin, which was prepared from the violet pansy by Willstätter and Weil2), was not a mixture in the sense of Karrer and de Meuron3), but a single substance of sufficient purity. From a series of analytical studies on newly isolated crystalline pigment, it becomes evident that violanin is not a diglycoside, but a complex triglycoside in which glucose (2mols.), rhamnose (1mol.), and p-coumaric acid (1mol.) are involved together with delphinidin (1mol.) as essential components. As regards the glycoside structure, it is assumed that in delphinidin the 3-hydroxyl group is occupied by a rhamnoglucosyl residue and the 5-hydroxyl by a glucosyl residue. p-Coumaric acid may be linked with either of these sugars, amongst which the 3-standing rhamnose is probablefor ester combination.

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