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- W1963510439 abstract "In this study, peroxidase from alfalfa sprout extract (Medicago sativa) was immobilized on a gold electrode, using a solution of the zwitterionic surfactant 3-(1-tetradecyl-3-imidazolio)propanesulfonate (ImS3-14) containing well-dispersed gold nanoparticles. In the presence of hydrogen peroxide, the peroxidase enzyme catalyzes the oxidation of hydroquinone to o-quinone, which is electrochemically reduced at a potential of +0.09 V vs. Ag/AgCl. The hydroquinone biosensor exhibited excellent electrocatalytic activity under the optimized experimental conditions ([peroxidase] = 97 units mL−1, [H2O2] = 7.4 × 10−5 M, pH 7.0, frequency of 100 Hz, pulse amplitude of 60 mV and scan increment of 4.0 mV). Peak current linearity was observed in the range of 6.96 × 10−7 to 8.54 × 10−6 M, and the detection limit was estimated to be 1.88 × 10−7 M. This biosensor demonstrated good repeatability and reproducibility with relative standard deviations of 3.6% and 6.5%, respectively, and an acceptable stability (at least 100 determinations). The method has been applied to the determination of hydroquinone in skin-brightening creams and the recoveries were 98.3–104.5%." @default.
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- W1963510439 date "2012-10-01" @default.
- W1963510439 modified "2023-10-01" @default.
- W1963510439 title "Gold nanoparticles dispersed in zwitterionic surfactant for peroxidase immobilization in biosensor construction" @default.
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- W1963510439 doi "https://doi.org/10.1016/j.snb.2012.07.054" @default.
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