ScienceAsia 15 (1989): 139-147 |doi: 10.2306/scienceasia1513-1874.1989.15.139

STEROIDAL SAPONINS OF COSTUS LACERUS

UMA PRAWAT ,^a PITTAYA TUNTIWACHWUTTIKUL ,^b AND WALTER C. TAYLOR^c

ABSTRACT: Acid hydrolysis of the rhizomes of Costus lacerus Gagn. yielded diosgenin in 1.7 percent. The 95% ethanolic extract of the rhizomes yielded -sitosterol--D-glucoside, prosapogenin A, dioscin and graciIIin. Partial hydrolysis of graciIIin gave the new saponin, 3-0-[-D-glucopyranosyI-(1 3)]-[-D-glucopyranosyl] diosgenin.

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a Department of Chemistry, Phuket Teachers College, Phuket 83000, Thailand.
b Department of Chemistry, Faculty of Science, SiIpakorn University, Nakorn Pathom 73000, Thailand.
c Department of Organic Chemistry, University of Sydney, N.S.W. 2006, Australia.

Received 28 March 1989