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| Articles
by
Mounyr Balouiri |
Total Records (
2 ) for
Mounyr Balouiri |
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Mounyr Balouiri
,
Samira Bouhdid
,
El Houssaine Harki
,
Moulay Sadiki
,
Wessal Ouedrhiri
,
Soumya El Abed
and
Saad Koraichi Ibnsouda
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Candida albicans is the most common fungal pathogen of humans; this infectious agent can adhere and colonize several surfaces to establish many dangerous infections. The effect of methanol extract from Bacillus sp. isolated from Calotropis procera Ait. rhizosphere on the physicochemical characteristics of Candida albicans cell surface was investigated. The Lifshitz-van der Waals (γLW), acid-base (surface tension components ΔGiwi, electron donor (γ–) and electron acceptor (γ+) parameters of the yeast cell surface were assessed using contact angle measurement. Results showed higher antifungal activity of methanol extract against tested yeast. Regarding contact angle measurements, cell surface of control or untreated C. albicans showed a hydrophilic character (ΔGiwi = 19.96 mJ m–2), a strong electron donor character (γ– = 48.4 mJ m–2) and a weak electron acceptor character (γ+ = 5.8 mJ m–2). After limited exposure to the antifungal extract, the treated cell surface has become more hydrophilic quantitatively. Moreover, the results showed an increase of the electron donor character and a decrease of the electron acceptor character. However, non-significant modifications on the physicochemical characteristics of cell surface between exposures for 1 and 2 h to the extract were found. The present investigation may provide information that could be used to alter or modify the adherence of C. albicans to biotic and abiotic surfaces. |
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Moulay Sadiki
,
Soumya El Abed
,
Hassan Barkai
,
Mounyr Balouiri
,
Fatima Zahra El Bergadi
and
Saad Ibnsouda Koraichi
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In this study, the effect of different Thymus vulgaris extract fractions on Cell Surface Hydrophobicity (CSH) and acid-base properties of three fungal strains (Penicillium commune (PDLd10), Penicillium commune (PDLd’’) and Thielavia hyalocarpa (PDLb3)) using contact angle measurement method was investigated. The main results demonstrated that all fractions tested are able to influence fungal cell physicochemical properties. Indeed, the methanolic and ethyl acetate fractions were effective in reducing CSH and made the cells more hydrophilic and highly electron donor (p<0.05) compared to the untreated ones. Whereas, the hexane-ethyl acetate treatment was found made them more hydrophobic and weakly donor electron compared to the control (p<0.05). It is also noted that the modification degree of microbial cell surface properties was fraction-dependent. |
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