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• W2045455084 abstract "An amperometric biosensor based on cholinesterase (ChE) has been used for the determination of selected carbamate insecticides in vegetable samples. The linear range of the biosensor for the N-methylcarbamates (aldicarb, carbaryl, carbofuran, methomyl and propoxur) varied from 5 × 10−5 to 50 mg kg−1. Limits of detection were calculated on the basis that the ChE enzymes were 10% inhibited and varied, depending of the combination ChE (as acetyl- or butyrylcholinesterase) vs. inhibitor (pesticide), from 1 × 10−4 to 3.5 mg kg−1. The biosensor-based carbamate determination was compared to liquid chromatography/UV methods. Three vegetable samples were spiked with carbofuran and propoxur at 125 μg kg−1 followed by conventional procedures. Good correlations were observed for carbofuran in the vegetable extracts (79, 96 and 91% recoveries for potato, carrot and sweet pepper, respectively), whereas for propoxur unsatisfactory results were obtained. Potato and carrot samples were spiked with 10, 50 and 125 μg kg−1 carbofuran, followed by direct determination by the amperometric biosensor. The fortified samples resulted in very high inhibition values, and recoveries were: 28, 34 and 99% for potato, and 140, 90 and 101% for carrot, respectively, at these three fortification levels." @default.
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• W2045455084 date "1998-04-01" @default.
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• W2045455084 title "Determination of carbamate residues in crop samples by cholinesterase-based biosensors and chromatographic techniques" @default.
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• W2045455084 doi "https://doi.org/10.1016/s0003-2670(97)00547-3" @default.
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