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Improved Detection of Ascorbic Acid with a Bismuth-Silver Nanosensor
- van der Horst, Charlton, Silwana, Bongiwe, Iwuoha, Emmanuel, Gil, Eric, Somerset, Vernon
- Food analytical methods 2016 v.9 no.9 pp. 2560-2566
- analytical methods, ascorbic acid, catalytic activity, detection limit, electrochemistry, glassy carbon electrode, nanoparticles, oxidation
- Bismuth-silver bimetallic nanoparticles glassy carbon electrode (Bi-AgNPs/GCE) was employed for the determination of ascorbic acid (AA) in fruit and pharmaceutical samples. In this study, the Bi-AgNPs/GCE showed excellent electrochemical catalytic activities toward AA oxidation compared with bare GCE. Ascorbic acid gave a sensitive oxidation peak at 0.23 V using differential pulse voltammetry. Under optimized experimental conditions, the limit of detection for AA was 0.16 μM (for S/N = 3), the analytical range for AA was between 0.4 and 1.2 μM (R ² = 0.994) and the RSD was 5.84 % (n = 10). The proposed method showed good stability, reproducibility, and repeatability as well as good recovery in fruit and pharmaceutical samples.