2005
DOI: 10.1007/s00216-004-3013-3
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Determining pirimiphos-methyl in durum wheat samples using an acetylcholinesterase inhibition assay

Abstract: An electrochemical assay used for detecting acetylcholinesterase (AChE) inhibitors has been optimised to detect pirimiphos-methyl in durum wheat. Pirimiphos-methyl is a phosphothionate insecticide and so it needs to be transformed into the corresponding oxo form to act as an effective AChE inhibitor. The inhibition assay was based on the electrochemical detection of the product of AChE, choline, via choline oxidase biosensors obtained with Prussian-Blue modified screen printed electrodes. The procedure for the… Show more

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Cited by 27 publications
(17 citation statements)
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“…The organophosphorus and carbammic insecticides were also measured in extract of sheep wool [183], potable, river and lake water samples [47, 133,184], milk [185], grape and vine leaf samples [186,187], wheat and durum wheat [188][189][190], apple skin [191], orange juice [165], garlic [192], lettuce, rice, onion [193,194], in samples of fruit, vegetable and dairy product [48,195] and directly in tomato [196]. In the last case, the insecticides were measured without any previous manipulation of the sample, in fact the biosensor was immersed directly in the tomato pulp obtaining a recovery of 83.4% and showing a very low interference of the matrix components.…”
Section: Cholinesterase Biosensor Applications For Nerve Agents Measumentioning
confidence: 99%
“…The organophosphorus and carbammic insecticides were also measured in extract of sheep wool [183], potable, river and lake water samples [47, 133,184], milk [185], grape and vine leaf samples [186,187], wheat and durum wheat [188][189][190], apple skin [191], orange juice [165], garlic [192], lettuce, rice, onion [193,194], in samples of fruit, vegetable and dairy product [48,195] and directly in tomato [196]. In the last case, the insecticides were measured without any previous manipulation of the sample, in fact the biosensor was immersed directly in the tomato pulp obtaining a recovery of 83.4% and showing a very low interference of the matrix components.…”
Section: Cholinesterase Biosensor Applications For Nerve Agents Measumentioning
confidence: 99%
“…The detection limit (LOD) corresponds to the amount of inhibitor which leads to the decrease of the signal equal to three times the standard deviation of the signal measurement [28][29][30].…”
Section: Figurementioning
confidence: 99%
“…The bi-enzymatic sensors for measuring the content of OP pesticides can be realized according to different ways and analytical formats, each of them taking -using a biosensor with acetylcholinesterase and choline oxidase co-immobilised on the support [6][7][8][9][10][11]; -with immobilised ChOx on the electrode and AChE free in solution [12][13][14][15][16][17]; -using AChE immobilised on a separate membrane upon which inhibition takes place and a ChOx sensor for the amperometric detection into interference-free solutions.…”
Section: Evaluation Of the Cholinesterase Inhibitionmentioning
confidence: 99%