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Hydroxylation of a hederagenin derived saponin by a Xylareaceous fungus found in fruits of Sapindus saponaria

DOI: 10.1590/S0103-50532008000500004

Keywords: sapindus saponaria, saponin, xylaria, biotransformation, hydroxylation.

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Abstract:

during our screening of tropical plants for endophyte microorganisms, a xylareaceous fungus was found living on the internal part of sapindus saponaria fruits. the fruits of s. saponaria accumulate great amounts of triterpenoidal and sesquiterpenoidal saponins. the saponin 3-o-(β-d-xylopyranosyl)-(1→3)-α-l-rhamnopyranosyl-(1→2)-α-l-arabinopyranosyl-hederagenin was isolated using chromatographic methods, after alkaline hydrolysis of the crude extract obtained from s. saponaria fruits and added to the culture medium used to grows the fungus. a new saponin was isolated from this experiment by preparative scale hplc and characterized as a 22α-hydroxy derivative. the structure of this hydroxylated saponin was elucidated based on interpretation of ms/ms data and nmr spectra.

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