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Fungicidal properties of two saponins from Capsicum frutescens and the relationship of structure and fungicidal activity

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Two steroidal saponins have been purified from cayenne pepper (Capsicum frutescens). Both have the same steroidal moiety but differ in the number of glucose moieties: the first saponin has four glucose moieties (molecular mass 1081 Da) and the second contains three glucose moieties (molecular mass 919 Da). Solubility in aqueous solution is less for the saponin containing three glucose moieties than for the one containing four glucose moieties. The larger saponin was slightly fungicidal against the nongerminated and germinating conidia of Aspergillus flavus, A. niger, A. parasiticus, A. fumigatus, Fusarium oxysporum, F. moniliforme, and F. graminearum, whereas, the second saponin (molecular mass 919 Da) was inactive against these fungi. Results indicate that the absence of one glucose molecule affects the fungicidal and aqueous solubility properties of these similar molecules.Key words: fungicidal, saponin, structure–function.

Deux saponines stéroïdiques ont été purifiées du poivre de cayenne (Capsicum frutescens). Les deux avaient le même groupe stéroïdique mais différaient dans le nombre de groupes glucose: la première saponine avait quatre groupes glucose (masse moléculaire de 1081 Da) et la seconde contenait trois groupes glucose (masse moléculaire de 919 Da). La solubilité en solution aqueuse était inférieure pour la saponine contenant trois glucoses comparativement à la molécule contenant quatre glucoses. La plus grosse saponine était légèrement fongicide contre des conidies non germinées et en germination de Aspergillus flavus, A. niger, A. parasiticus, A. fumigatus, Fusarium oxysporum, F. moniliforme et F. graminearum alors que la seconde saponine (masse moléculaire de 919 Da) était inactive contre ces champignons. Les résultats indiquent que l'absence d'une molécule de glucose affecte les propriétés fongicides et de solubilité aqueuse de ces molécules semblables.Mots clés : fongicide, saponine, structure-fonction.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2006-04-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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