Electrochemical determination of tert-butylhydroquinone and butylated hydroxyanisole at choline functionalized film supported graphene interface

A convenient, rapid and low-cost method for electrochemical determination of antioxidants was realized at choline (Ch) functionalized monolayer supported graphene interface. The Ch monolayer provided a positively charged surface with -N+(CH3)(3) polar head groups, which can not only increase the active site density of electrode for interfacial electron transfer, but also build a favorable local microenvironment for the construction of negatively charged graphene. As a consequence, the graphene was uniformly and compactly assembled on Ch monolayer with a suitable distribution state. The resulting graphene/Ch film modified glassy carbon electrode exhibited remarkable electrocatalytic activities toward the oxidation of tert-butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA). The peak separation between TBHQand BHA was achieved to be 0.238V, which was large enough for their potential recognition. Under the optimum conditions, the proposed method exhibited wide linear range and low detection limit for simultaneous detection of TBHQ and BHA. Moreover, the practical application ability of the proposed system was confirmed by detection of TBHQ and BHA in commercial edible oil samples. (C) 2015 Elsevier B.V. All rights reserved.