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Deprecated: Implicit conversion from float 312.4 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Anal+Chim+Acta 2021 ; 1159 (ä): 338418 Nephropedia Template TP
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English Wikipedia
First electrochemical evaluation of favipiravir used as an antiviral option in the treatment of COVID-19: A study of its enhanced voltammetric determination in cationic surfactant media using a boron-doped diamond electrode #MMPMID33867032
Allahverdiyeva S; Yunusoglu O; Yardim Y; Senturk Z
Anal Chim Acta 2021[May]; 1159 (ä): 338418 PMID33867032show ga
Favipiravir, a promising antiviral agent, is undergoing clinical trials for the potential treatment of the novel coronavirus disease 2019 (COVID-19). This is the first report for the electrochemical activity of favipiravir and its electroanalytical sensing. For this purpose, the effect of cationic surfactant, CTAB was demonstrated on the enhanced accumulation of favipiravir at the surface of cathodically pretreated boron-doped diamond (CPT-BDD) electrode. At first, the electrochemical properties of favipiravir were investigated in the surfactant-free solutions by the means of cyclic voltammetry. The compound presented a single oxidation step which is irreversible and adsorption controlled. A systematic study of various operational conditions, such as electrode pretreatment, pH of the supporting electrolyte, concentration of CTAB, accumulation variables, and instrumental parameters on the adsorptive stripping response, was examined using square-wave voltammetry. An oxidation signal at around +1.21 V in Britton-Robinson buffer at pH 8.0 containing 6 x 10(-4) M CTAB allowed to the adsorptive stripping voltammetric determination of favipiravir (after 60 s accumulation step at open-circuit condition). The process could be used in the concentration range with two linear segments of 0.01-0.1 mug mL(-1) (6.4 x 10(-8)-6.4 x 10(-7) M) and 0.1-20.0 mug mL(-1) (6.4 x 10(-7)-1.3 x 10(-4) M). The limit of detection values were found to be 0.0028 mug mL(-1) (1.8 x 10(-8) M), and 0.023 mug mL(-1) (1.5 x 10(-7) M) for the first and second segments of calibration graph, respectively. The feasibility of developed methodology was tested to the analysis of the commercial tablet formulations and model human urine samples.