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• W4317209907 startingPage "2091" @default.
• W4317209907 abstract "A stopped-flow microfluidic system to monitor glutathione peroxidase (GPx) activity and evaluate potential inhibitors of the enzyme has been developed based on the integration of the microfluidic chip in the reaction/detection zone. This integration supposes the physical alignment at the optimal location of the microfluidic channel, both the magnetically retained enzyme microreactor (MREµR) and the remote luminescence detection using a focused bifurcated fiber optic bundle (BFOB) connected to a conventional spectrofluorometer detector. The method is based on the coupling of two competitive oxidative chemical reactions, in which glutathione (GSH) and homovanillic acid (HVA) competed for their interaction with hydrogen peroxide in the presence of the magnetically retained GPx-MNPs. The biocatalytic reaction was followed by monitoring the fluorescence of the biphenyl-HVA dimer formed. The dynamic range of the calibration graph was 0.45-10 µmol L-1, expressed as GSH concentration with a detection limit of 0.1 µmol L-1 (r2 = 0.9954, n = 10, r = 3). The precision expressed as the relative standard deviation (RSD%) was between 0.5 and 3.9%. The stopped-flow microfluidic system showed a sampling frequency of 25 h-1. The method was applied to the study of GPx inhibition provided by three inhibitory compounds, two metallic ions Hg(II) and Cu(II) and t-butyl hydroperoxide, and their presence in liquid samples, as water, milk, and edible oil. Recovery values between 88.7 and 99.4% were achieved in all instances." @default.
• W4317209907 created "2023-01-18" @default.
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• W4317209907 date "2023-01-18" @default.
• W4317209907 modified "2023-10-18" @default.
• W4317209907 title "Study of the inhibition effects on glutathione peroxidase immobilized on MNPs using a stopped-flow microfluidic system" @default.
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• W4317209907 doi "https://doi.org/10.1007/s00216-023-04521-0" @default.
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