Abstract
This paper reported a simple method for sulfanilamide determination by redox process electroanalysis of oxidation products (SFDox) formed in situ on glassy carbon electrode. The CV experiments showed a reversible process after applied E acc = + 1.06 V and t acc = 1 s, in 0.1 mol L−1 BRBS (pH = 2.0) at 50 mV s−1. Different voltammetric scan rates (from 10 to 450 mV s−1) suggested that the redox peaks of SFDox on the glassy carbon electrode (GCE) is an adsorption-controlled process. Square-wave voltammetry (SWV) method optimized conditions showed a linear response to SFD from 3.00 to 250.0 μmol L−1 (R = 0.998) with a limit of detection of 0.638 μmol L−1 and limit of quantification of 2.0 μmol L−1. The developed the SWV method was successfully used in the determination of SFD pharmaceutical formulation and human serum. The SFD quantification results in pharmaceutical obtained by SWV-GCE were comparable to those found by official analytical protocols.
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The authors thank UFES, CNPq, CAPES, and FAPES for the financial support.
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Ferraz, B.R.L., Profeti, D. & Profeti, L.P.R. Sensitive detection of sulfanilamide by redox process electroanalysis of oxidation products formed in situ on glassy carbon electrode. J Solid State Electrochem 22, 339–346 (2018). https://doi.org/10.1007/s10008-017-3764-3
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DOI: https://doi.org/10.1007/s10008-017-3764-3