Characteristic Component of Rehmanniae Radix Preparata Compared to Rehmanniae Radix and Rehmanniae Radix Crudus

숙지황, 건지황 및 생지황 중 숙지황의 특이성분 검색

Rehmanniae Radix Preparata is manufactured with Rehmanniae Radix accoding to KP V. For quality control of Rehmanniae Radix Preparata, its standard component is required. The methanol extracts of Rehmanniae Radix crudus, Rehmanniae Radix, Rehmanniae Radix preparata were divided into the three groups of ether, butanol and aqueous fraction by liquid-liquid separation. In the comparative TLC of ether fraction, the characteristic component of Rehmanniae Radix preparata was found. The ether fraction was evaporated and separated on the silica gel column with chloroform-methanol and further separated on the preparative silica gel TLC with chloroform-methanol-water. The component was illucidated as 5-(hydroxymethyl)-2-furancarboxaldehyde(5-HMF). 5-HMF was not found in Rehmanniae Radix crudus and found in Rehmanniae radix in much less Quantities than Rehmanniae Radix Preparata.

생지황을 구증구폭하여 제조한 숙지황은 품질관리를 위한 지표물질이 아직 명확히 밝혀져 있지 않다. 생지황, 건지황과 숙지황을 methanol로 추출하고 ether, butanol, 수층으로 용매 분획하고 각 분획별로 TLC로 성분분석한 결과 ether층에서 숙지황의 특이성분이 나타났고, ether층을 증발농축하고 chloroform/methanol을 이동상으로 한 silica gel column으로 분리하고 다시 chloroform/methanol/물(7:1:1)의 preparative TLC로 단리하여 이 성분이 5-(hydroxymethyl)-2-furancarboxaldehyde(5-HMF)임이 규명되었다. 5-HMF는 생지황과 건지황에서는 숙지황에 비해 극히 미량이 존재하였다.