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Structure elucidation and complete NMR spectral assignments of glucosylated saponins of cantalasaponin I

Authors


Bai-ping Ma, Department of Biotechnology, Beijing Institute of Radiation Medicine, 27 Taiping Road, Beijing 100850, China. E-mail: mabaiping@sina.com

Abstract

Five new glucosylated steroidal glycosides, cantalasaponin I-B1 (1), I-B2 (2), I-B3 (3), I-B4 (4) and I-B5 (5), were isolated and purified from the transformed product of the cantalasaponin I by using Toruzyme 3.0 l as biocatalyst. Their structures were elucidated on the basis of high-resolution electrospray ionization mass spectrometry, one-dimensional (1H and 13C NMR) and two-dimensional [COSY, heteronuclear single-quantum correlation (HSQC), HMBC and HSQC-TOCSY] NMR spectral analyses and chemical evidence. Copyright © 2012 John Wiley & Sons, Ltd.

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