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■ Mass Spectral Analysis of Cardiac Steroids Isolated from Elaeodendron glaucum

Hiroko F. Kasai,* Ken-ichi Kawai, and Kazutake Shimada

*Faculty of Pharmaceutical Sciences, Hoshi University, 2-4-41 Ebara, Shinagawa-ku, Tokyo 142-8501, Japan

Abstract

The electron ionization mass spectrometric data of three cardiac glycosides having an unusual sugar linkage, elaeodendrosides A, B and C, are reported. The decomposition patterns upon EI-MS were investigated by means of collision induced dissociation utilizing B/E linked scan experiments and deuterium labeling techniques. Besides the fragment ions related to aglycones, elaeodendroside A which is a 12-keto steroid, produces decomposition ions derived from cleavage of steroidal C- and D-rings. Elaeodendrosides B and C, which have a six-membered hemiacetal ring, generate ions derived from the cleavage of sugar rings and the aforementioned unusual sugar linkage.