「大黄」の研究(II) : 大黄を加熱乾燥する意義

概要

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The ancient processing method for Da-huang is "fire-drying" (「火乾」,「〓」). "Fire-drying" means heat-drying at a high temperature. The main advantage of heat-drying was said to be the prevention of damage by vermin in old Chinese herbals. However, today some Da-huang is not heat-dried. To study another effect of heat-drying, the fresh underground part (root and rhizome) of Rheum palmatum var. tanguticum were processed using various methods, and anthraquinones, sennoside A, B and polyphenol (gallic acid, (+)-catechin, (-)-epicatechin gallate) contents were determined after processing by absorptiometry and HPLC. The results showed that the sennosides decreased, but that the anthraquinones and gallic acid increased, when heat-drying was performed at ISOt. Our findings indicate that heat-drying means reducing purgative compound sennosides and increasing other properties of the medicine.
日本生薬学会の論文
2001-12-20