Pt-MWCNT modified carbon electrode strip for rapid and quantitative detection of H 2 O 2 in food


A single-use screen-printed carbon electrode strip was designed and fabricated. Nanohybrids, prepared by deposition of platinum (Pt) nanoparticles on multi-wall carbon nanotube (MWCNT), was modified on the surface of screen-printed carbon electrode for the development of a fast, sensitive and cost-effective hydrogen peroxide (H 2 O 2 ) detection amperometric sensor strip. With Pt-MWCNT nanohybrids surface modification, current generated in response to H 2 O 2 by the screen-printed carbon electrode strip was enhanced 100 fold with an applied potential of 300 mV. Quality of as-prepared electrode strip was assured by the low coefficient of variation (CV) (<5%) of currents measured at 5 s. Three linear detection ranges with sensitivity of 75.2, 120.7, and 142.8 μA mM −1 cm −2 were observed for H 2 O 2 concentration in the range of 1–15 mM, 0.1–1 mM, and 10–100 μM, respectively. The lowest H 2 O 2 concentration could be measured by the as-prepared strip was 10 μM. H 2 O 2 levels in green tea infusion and pressed Tofu could be rapidly detected with results comparable to that measured by ferrous oxidation xylenol orange (FOX) assay and peroxidase colorimetric method. © 2017

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