A new steroidal glycoside called aphelasteroside E was isolated from the Far-East starfish Aphelasterias japonica. Its structure was proposed as the sodium salt of 26-O-sulfate (25S)-3-O-β-D-xylopyranosyl-5α-cholestan-3β,5,6β,15α,26-pentaol. Two previously known asterosaponins were also isolated. The structures of the isolated compounds were elucidated using 2D NMR spectroscopy and tandem mass spectrometry with electrospray ionization (ESI).
starfish Aphelasterias japonicaglycoside steroidal aglycon NMR spectroscopy ESI mass spectrometry
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The work was supported financially by the RAS Presidium Program “Molecular and Cellular Biology”; the RFBR (Grant No. 11-04-00052-a); grants of the FEB RAS No. 12-III-A-05-058 and 13-III-B-05-089; and a grant of the RF President for Support of Leading Scientific Schools No. 546.2012.4.
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