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• W3045507811 abstract "Abstract The threat of organophosphorus pesticide (OPP) residue to food safety and human health has caused widespread concern. In this paper, a sensitive fluorescence sensor for OPP detection was constructed based on the alkaline phosphatase (ALP) -triggered in situ reaction. In this method, ALP catalyses the dephosphorylation of the substrate l -ascorbic acid 2-phosphate sesquimagnesium salt hydrate (AAP) to generate l -ascorbic acid (AA). AA instantly combines with o-phenylenediamine (OPD) to form 3-(1,2-dihydroxyethyl)furo[3,4-b]quinoxalin-1(3H)-one (DFQ), which contains a quinoxaline core skeleton fluorophore and emits a strong fluorescence intensity at 425 nm. The existence of OPPs inhibits the activity of ALP and the production of AA and DFQ. As a result, the fluorescence intensity obviously decreases. Under optimal conditions, the fluorescence intensity linearly depends on the logarithm of chlorpyrifos concentration over a wide range of 20 pg/mL ∼1000 ng/mL with a detection limit of 15.03 pg/mL (S/N = 3), which is lower than the previously reported values. The sensor with its satisfactory accuracy and precision has been successfully applied to the detection of chlorpyrifos in leeks and celery samples with recoveries of 94.5–106.7% and an inter-assay relative standard deviation (RSD) below 11.51%. OPPs can be semiquantitatively determined by the colour changes in ultraviolet light. The superiority of the sensor is due to its visual simplicity without complex fluorescence labelling procedures and costly instruments." @default.
• W3045507811 created "2020-08-03" @default.
• W3045507811 creator A5003799076 @default.
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• W3045507811 date "2020-09-01" @default.
• W3045507811 modified "2023-09-29" @default.
• W3045507811 title "Fluorescence sensor for organophosphorus pesticide detection based on the alkaline phosphatase-triggered reaction" @default.
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• W3045507811 doi "https://doi.org/10.1016/j.aca.2020.07.048" @default.
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