Sensitive Detection of 8-Hydroxyquinoline in Cosmetics by Using a Poly(tannic acid)-Modified Glassy Carbon Electrode

摘要

Tannic acid (TA) as a natural plant polyphenol bearing multiple phenolic hydroxyl groups could cause considerable interactions with organic compounds. This work aims at detecting 8-hydroxyquinoline (8-HQ) based on poly (tannic acid) (PTA) by electropolymerization of TA on glassy carbon electrode (GCE). Owing to enhanced modified electrode surface area and interactions of PTA with 8-HQ via hydrogen bonding and pi-pi stacking, PTA/GCE exhibits electrocatalytic activity to 8-HQ. Using Differential pulse voltammetry, PTA/GCE shows two linear plots with 8-HQ concentrations from 0.5 to 5 mu mol L-1 and 5 to 50 mu mol L-1, the detection limit is 0.036 mu mol L-1. The PTA modified electrode also shows great reproducibility and stability. The application of the sensor for real hair conditioner samples is demonstrated with satisfactory result.

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