Original research articles

Effects of some pesticides on two yeast strains Saccharomyces cerevisiae and Metschnikowia pulcherrima

Abstract

The effect of different concentrations (0-20 LMR) of six pesticides on the aerobic growth of two yeast strains (Saccharomyces cerevisiae, Metschnikowia pulcherrima) was analysed. The penconazole was shown as the most efficient and its effect was then studied under fermentative conditions. Saccharomyces cerevisiae appeared very sensitive under aerobiosis while the fermentative cultures seemed poorly affected. On the opposite, Metschnikowia pulcherrima was poorly affected under aerobiosis but was severely affected under fermentative conditions. The yields as well as the reaction rates decreased when initial concentrations of penconazole were increased. At least, it was shown that both strains were able to adsorb a certain ratio of the pesticide; but the pesticide was not degraded. Also for an initial value greater than 2 LMR, the residual quantity of the pesticide was above the admitted level.

Authors


Dalal Jawich

Affiliation : Laboratoire de Fanar, Institut de Recherche Agronomique Libanais (IRAL), B.P. 90-1965, Beyrouth, Liban; Université Saint Joseph, Faculté des Sciences, Campus des Sciences et Technologies, Mar Roukos, Mkallès, BP 11-514 Riad El Solh, Beyrouth, Liban; Laboratoire de Génie Chimique, UMR-CNRS 5503, 5 rue Paulin Talabot, 31106 Toulouse cedex, France


Christo Hilan

Affiliation : Laboratoire de Fanar, Institut de Recherche Agronomique Libanais (IRAL), B.P. 90-1965, Beyrouth, Liban


Rachad Saliba

Affiliation : Université Libanaise, Faculté d'Agronomie, Département des Sciences et des Technologies Agroalimentaires, B.P. 13-5368 Beyrouth, Liban


Roger Lteif

Affiliation : Département de Chimie, Université Saint-Joseph, Faculté des Sciences, Mar Roukoz, Mkallès Po.Box 11514, 1107-2050, Beirut, Lebanon


Pierre Strehaiano

Affiliation : Laboratoire de Génie Chimique (UMR CNRS 5503), 4, allée Emile Monso, 31432 Toulouse, France

Pierre.Strehaiano@ensiacet.fr

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