Abstract
Objective To investigate the secondary metabolites of fungus Engyodontium album(E.album) associated with the South China Sea cucumber Holothuria nobilis(H.nobilis) Selenka.MethodsThe EtOAc extract of E.album was purified by repeated column chromatography on silica gel,Sephadex LH-20,and high-performance liquid chromatography(HPLC).Structures of the obtained compounds were determined by spectroscopic analysis and comparison with previously reported data.ResultsFive compounds were isolated and their structures were determined as:(22E,24R)-5α,8α-epidioxy-ergosta-6,22-dien-3β-ol (1),(22E,24R)-ergosta-5,7,22-trien-3β-ol (2),(22E,24R)-ergosta-7,22-dien-3β,5α,6β-triol (3),3β,5α-dihydroxy-(22E,24R)-ergosta-7,22-dien-6-one (4),3β,5α-dihydroxy-6β-methoxy-ergosta-7,22-dien (5).ConclusionThis is the first report on the secondary metabolites of E.album associated with the sea cucumber H.nobilis Selenka,and the five compounds have been reported for the first time from the fungus E.album.
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