著者

辻村 みちよ 高須 英

出版者

公益社団法人 日本農芸化学会

雑誌

日本農芸化学会誌 (ISSN:00021407)

巻号頁・発行日

vol.29, no.6, pp.407-412, 1955

被引用文献数

4

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On the paper chromatogram of crude tea tannin, fannin, four spots are to be seen, <i>R_F</i> values of which being 0.81, 1.72, 1.67 and 0.52, these excepting 0.72, correspond to tea tannin Itea tannin Itea catechin I tea catechin II, which have been formerly separated by the present author (see Plate 1).<br> The author has recently isolated tea tannin II, the <i>R_E</i> value of which is corresponding (see Plate II). The crystalline form of this tea tannin II is shown in Plate III, m. p. 248_??_9&deg;, [&alpha;]¹⁸_D=-173&deg;. Its aqueous solution has a hard astringent taste, when heated with dilute separates gallic acid and is converted into a reddish brown substance.<br> The absorption spectra of these four substances are shown in Plate III.<br> From above the newly isolated substance in recognizable as <i>l</i>-gallocatechin gallate.