title: [Residue analysis of methiocarb, repellent for the Quelea, in crops var. sorghum sp. (author's transl)].
abstract: The methiocarb (4-methylthio 3,5-dimethylphenyl N-methylcarbamate) has repellent properties towards against Quelea, a small bird deteriorating crops in Africa. The residue analysis of the carbamate compound and of its possible metabolites on treated Sorghum sp. was completed by TLC after chloroformic quantitative extraction. The isolation of metabolites by two dimensional thin layer chromatography demonstrates the presence of methiocarb sulfone. The quantitative survey of residues was achieved by the treatment of the methiocarb by hydrolyzed derivatives by dansylchloride, a very fluorescent component. The fluorescent densitometry of dansylated by methylamine allows a total measurement of the residues at a level of less than 10 ng. This investigation reveals the disappearance curve of methiocarb in our samples in process of time and to define the half-live and, therefore, the intervals of treatment. Taking into account the RI 50 index, our results provide encouraging support for the utilization of methiocarb in the eradication of the harmful Quelea.
mesh_terms: D000818:Animals; D001711:Biotransformation; D001717:Birds / Q000502:physiology*; D002855:Chromatography, Thin Layer; D002523:Edible Grain / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D008714:Methiocarb / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D013997:Time Factors
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D008714:Methiocarb
vernacular_title: Analyse dans les graminées de variété sorghum sp. des résidus d'un répulsif pour le Quelea: le méthiocarb.