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• W2023434522 abstract "A sulfite oxidase (SOX) (EC 1.8.3.1) purified from Syzygium cumini leaves was immobilized onto carboxylated gold coated magnetic nanoparticles (Fe3O4@GNPs) electrodeposited onto the surface of a gold (Au) electrode through N-ethyl-N′-(3-dimethylaminopropyl) carbodiimide (EDC)-N-hydroxy succinimide (NHS) chemistry. An amperometric sulfite biosensor was fabricated using SOX/Fe3O4@GNPs/Au electrode as working electrode, Ag/AgCl as standard and Pt wire as auxiliary electrode. The working electrode was characterized by Fourier Transform Infrared (FTIR) Spectroscopy, Cyclic Voltammetry (CV), Scanning Electron Microscopy (SEM) and Electrochemical Impedance Spectroscopy (EIS) before and after immobilization of SOX. The biosensor showed optimum response within 2 s when operated at 0.2 V (vs. Ag/AgCl) in 0.1 M Tris–HCl buffer, pH 8.5 and at 35 °C. Linear range and detection limit were 0.50–1000 μM and 0.15 μM (S/N = 3) respectively. Biosensor was evaluated with 96.46% recovery of added sulfite in red wine and 1.7% and 3.3% within and between batch coefficients of variation respectively. Biosensor measured sulfite level in red and white wines. There was good correlation (r = 0.99) between red wines sulfite value by standard DTNB (5,5′-dithio-bis-(2-nitrobenzoic acid)) method and the present method. Enzyme electrode was used 300 times over a period of 4 months, when stored at 4 °C. Biosensor has advantages over earlier biosensors that it has excellent electrocatalysis towards sulfite, lower detection limit, higher storage stability and no interference by ascorbate, cysteine, fructose and ethanol." @default.
• W2023434522 created "2016-06-24" @default.
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• W2023434522 date "2012-01-01" @default.
• W2023434522 modified "2023-10-08" @default.
• W2023434522 title "An electrochemical sulfite biosensor based on gold coated magnetic nanoparticles modified gold electrode" @default.
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• W2023434522 doi "https://doi.org/10.1016/j.bios.2011.10.007" @default.
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