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Thursday, December 12

Progress in Photoelectrochemical Assay of Antioxidants Capacitance in Foods

Dongxue Han, Changchun Institute of Applied Chemistry, Changchun, China
Chemical Sciences Division Seminar
10:00 PM — 11:00 PM, Chemical and Material Sciences Building (4100), Room C-201
Contact: Sheng Dai (dais@ornl.gov ), 865.576.7307

Abstract

A kind of novel nanocomposite-the ultrathin graphitic carbon nitride (ug-C3N4) was prepared with high specific surface areas, unique electronic and optical properties. Then the ug-C3N4 was composited with TiO2 and formed ug-C3N4/TiO2. As photoelectrochemical elements, ug-C3N4/TiO2 was applied to design a thin layer photoeletrochemical flow cell since it presented excellent optoelectronic properties. This novel photoelectrochemical method was firstly introduced in sensing antioxidant capacity, which helps to solve three tough problems in chromatographic, optical and electrochemical methods. (i) the chromatograph methods are very expensive and time-consuming, while it is always determination of antioxidants but not antioxidants capacity; (ii) for optical methods, the results are frequently interfered by the colored materials; (iii) for electrochemical methods, the work electrode is apt to be poisoned and affect the following detections. Therefore, this novel photoelectrochemical method present preferable features as rapidly response, anti-poison and color interference immunity. These significant features allow the real-time sensing antioxidant capacity in food.