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| - Behavior of Metalaxyl and Its Pure R-Enantiomer in SunflowerPlants (Helianthus annus)
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| - A possible stereospecific and/or stereoselective mechanism of biodegradation for metalaxyl andmetalaxyl-M was studied to elucidate their behavior in sunflower plants and to compare theirbiodegradation. Greenhouse experiments were carried out to confirm the same efficacy of the twofungicides against infections by Plasmopara helianthi in sunflower plants. The two fungicides appearto have the same behavior regarding both the protection against plant infections and the mode oftranslocation and the rate and pathway of biotransformation, but we have evidence that thisbiotransformation process is enantioselective. Furthermore, we propose procedures for a chromatographic separation of enantiomers and acid metabolites of the fungicides and for the determinationof the R:S ratio by HPLC chiral analyses. This study emphasizes the importance of examining thefate of both stereoisomers of a chiral agrochemical in an environmental system for the correct use ofenantiomerically pure agrochemical compounds. Keywords: Metalaxyl; chirality; Oomycetes; enantiomers; biodegradation
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