超臨界流体抽出の生薬, 植物成分への応用(第3報)紫根及び甘草の色素について

概要

論文の詳細を見る
Supercritical fluid extraction was applied to the pigments of Lithospermum root and those of licorice root. Shikonin derivatives, the red pigments of Lithospermum root, were effectively extracted with supercritical carbon dioxide without using entrainer. Application of entrainer (ethanol or water) reduced efficiency in this extraction. The amounts of the substances which are immobile on TLC and regarded as oxidized products of shikonin derivatives, were significantly smaller than that obtained by the ordinary extraction with organic solvent (ether) when extracted with supercritical fluid without using entrainer, indicating an advantage of the latter extraction. Liquiritigenin of Sipei licorice (licorice root from the nor thwest region of China) and Tongpei licorice (licorice root from the northeast region of China), was extracted with supercritical carbon dioxide in the presence of the entrainer (5% ethanol). However, isoliquiritigenin possessing three phenolic hydroxyl groups was not extracted with supercritical fluid with or without entrainers (water and ethanol). Licochalcone A was extracted from Sinkiang licorice (licorice root from Sinkiang region of China), with carbon dioxide only, but the extraction of licochalcone B required addition of ethanol as entrainer.
1987-07-25