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  • Author or Editor: Asif M. Pathan x
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A novel chromogenic spray reagent “hydralazine” (phthalazin-1-ylhydrazine) is reported for thin-layer chromatographic (TLC) detection and identification of synthetic pyrethroids cypermethrin, deltamethrin, and λ-cyhalothrin from their dilute commercial formulations ranging from 2.5% to 25%. Alkaline hydralazine forms orange-yellow hydrazones with these insecticides at room temperature and does not require any further treatment. Reaction mechanism is discussed. The necessary TLC parameters like pH and concentration of analyte are also suggested for the efficient detection of these toxic pyrethroid insecticides.

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The insecticides are broadly divided into organophosphates, organochlorines, carbamates, and pyrethroids. Various chromogenic spray reagents have been reported for the identification of these classes of pesticides and insecticides. Some of them are specific and some are general for a particular class of insecticides. The large volume of insecticides belong still to the organophosphates which can be divided into thio and non-thio insecticides, on the basis of the presence or absence of a sulfur atom. We here present alkaline sodium nitroprusside as a simple chromogenic spray reagent which reacts with only a specific type of organothiophosphorus insecticides and not all organothiophosphorus insecticides.

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Organometallic compounds find wide applications such as in catalyses, syntheses, and also in biochemistry. Some of them can be used for the analysis of trace quantities of organic compounds which are regarded as toxic to human beings. Many pesticides have very low lethal dose (LD50) which could be fatal to humans, even in small quantities. The traces of many pesticides are being reported to be present in vegetables, fruits, and even in processed foods. Monocrotophos is one such pesticide which is approved for use in India and has caused many suicidal and accidental poisoning cases. Thus, a simple and sensitive method was necessary for its detection. We, in this study, reveal the application of sodium nitroprusside for the analysis of monocrotophos using a novel reaction with simple, cost-effective, but fast and reliable thin-layer chromatography technique.

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