フラボノイドの可溶化に関する研究 (第4報)
漢薬槐花よりルチンの抽出
1951 年 71 巻 9 号 p. 885-888
詳細
1951 年 71 巻 9 号 p. 885-888
By utilizing the formation of a water-soluble boron complex salt of rutin, rutin was extracted from Flos Sophorae japonicae, a chinese crude drug of the flowers of Sophora japonica. By cold digestion with extracting solutions Nos. 1, 2 and 3, in which the molar ratio of sodium hydroxide: boric acid were 1:2, 1:1.5 and 1:1, respectively, extraction with No. 1, which corresponds to 4.5% aqueous solution of borax, gave the best yield of 13%, a slightly better yield than methanolic extraction of 12%. Digestion with application of heat gave a poor yield. The yield was compared with the crystals of m.p. 175-180° obtained after one recrystallization from hot water.
