Naslov
Bismuth film random array carbon fiber micro electrodes for determination of cysteine and N-acetyl cysteine

Autori
Brinić, Slobodan ; Vladislavić, Nives ; Buzuk, Marijo ; Bralić, Marija ; Šolić, Mislav

Izvornik
Journal of electroanalytical chemistry (1572-6657) 705 (2013); 86-90

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bismuth film; micro electrodes; carbon micro fiber; stripping voltammetry; cysteine; N-acetyl cysteine

Sažetak
The electrochemical behaviors of bismuth at random array carbon fiber micro electrodes (RACFMEs) are studied by cyclic voltammetry. Obtained results indicate that dissolution of bismuth is facilitated in the presence of cysteine, by formation of bismuth cysteinate on electrode surface. Ex-situ prepared bismuth film random array carbon fiber micro electrodes (BiF-RACFMEs) were applied for determination of cysteine and N-acetyl cysteine (NAC) by using square wave cathodic stripping voltammetry (SWCSV). Formation of bismuth cysteinate was performed at -0.4 V, followed by bismuth reduction during cathodic sweep. The electrodes presented a linear response range toward cysteine and NAC, with estimated detection limits of 0.028 μmol L 1 and 0.069 μmol L 1, respectively. In the case of NAC two different linear concentration ranges of 0.1 μmol L 1 to 1.0 μmol L 1 and of 1.0 μmol L 1 to 10.0 μmol L 1 were obtained. The prepared BiF-RACFMEs have been successfully applied for determination of NAC in pharmaceutical samples (food supplement) with excellent recoveries.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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