Voltammetric Sensing of Caffeine in Food Sample using Cu-MOF and Graphene

Cu-MOF/graphene composite were obtained by solvothermal and electrochemical methods. The interaction and formation of Cu-MOF/graphene (GE) composite was systematically studied with the support of various characterizations including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and cyclic voltammogram (CV). The Cu-MOF/graphene composite coated glassy carbon (GC) electrode exhibited good catalytic performance towards the electro-oxidation of caffeine in neutral condition. The modified electrode displayed good linear range (5 mu M to 450 mu M), sensitivity (0.710 mu A mu M-1 cm(-2)), detection limit (1.38 mu M), selectivity, high stability and reproducibility. Finally, the fabricated electrode extended into successful detection of caffeine in tea and coffee samples with good recoveries.

Automated summary

Cu-MOF/graphene composite was successfully obtained by solvothermal and electrochemical methods, and its interaction and formation were systematically studied. The composite coated electrode exhibited good catalytic performance towards the electro-oxidation of caffeine in neutral condition.