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. 2024 Jul 19;191(8):471.
doi: 10.1007/s00604-024-06544-5.

Surface modification prepared porous copper oxide/(Cu-S)n metal-organic framework/reduced graphene oxide hierarchical structure for highly selective electrochemical quercetin detection

Sethupathi Velmurugan  1 , Man-Mo Tse  1 , Xiao-Yuan Lin  2 , Yuan-Hsiang Yu  2 , Shu-Hua Cheng  3 , Kuang-Lieh Lu  4
Affiliations

Surface modification prepared porous copper oxide/(Cu-S)n metal-organic framework/reduced graphene oxide hierarchical structure for highly selective electrochemical quercetin detection

Sethupathi Velmurugan et al. Mikrochim Acta. .

Abstract

Electrochemical alkalization of (Cu-S)n metal-organic framework (MOF) and graphene oxide ((Cu-S)n MOF/GO) composite yields a new CuO/(Cu-S)n MOF/RGO (reduced GO) composite with porous morphology on screen printed carbon electrode (SPCE) which facilitated the electron transfer properties in electrochemical quercetin (QUE) detection. A selective QUE detection ability has been demonstrated by the constructed electrochemical sensor (CuO/(Cu-S)n MOF/RGO/SPCE), which also has a broad dynamic range of 0.5 to 115 µM in pH 3 by differential pulse voltammetry. The detection limit is 0.083 µM (S/N = 3). In this study, it was observed that the real samples contained 0.34 mg mL-1 and 27.7 µg g-1 QUE in wine and onion, respectively.

Keywords: Alkalization; Differential pulse voltammetry; Electrochemical sensor; Metal–organic framework; Quercetin; Wine and vegetable samples.

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