局方生薬中のタンニンの定量法 (第1報)
ゲンノショウコ中のタンニンの定量法について (附: 季節的消長および個体間変動)
1962 年 82 巻 1 号 p. 82-86
詳細
1962 年 82 巻 1 号 p. 82-86
1) Tannin content in Geranium nepalense SWEET is determined by the difference in extinction of the aqueous solution of the tannin extract at pH 2.5 and pH 10 by the Maranvile-Geldschmid method and its value is converted into tannin content by the hide powder method: Tannin content (%)=L(0.493E-0.031)/S where L is the volume of extract solution (cc.), S is the weight (g.) of the sample, and E is the difference in extinction at 320mμ.
2) Seasonal variation of tannin content was examined and the maximum content was found to appear from the end of June to end of August. Individual variation in tannin content was great due to selection of the plant as wild species.
