Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (10): 2081.doi: 10.7503/cjcu20190333

• Analytical Chemistry • Previous Articles     Next Articles

Antioxidant Capacity Evaluation for Traditional Chinese Herbal Medicines Based on Sensitive g-C3N4/P25 Nanocomposite Photoelectrochemical Platform

LIANG Zhishan1,NI Shuang2,DAI Mengjiao3,HAN Fangjie3,HAN Lipeng1,NIU Li1,3,HAN Dongxue1,*()   

  1. 1. Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
    2. Chemistry Department, Northeast Normal University, Changchun 130024, China
    3. State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2019-06-13 Online:2019-10-10 Published:2019-08-20
  • Contact: HAN Dongxue E-mail:dxhan@gzhu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China.(No.21622509)

Abstract:

Chinese herbal medicines are rich in resources and can be found in various types. The efficacy of some Chinese herbal medicines are closely related to their antioxidant effects. Therefore, the rapid and accurate evaluation of the antioxidant capacity is the foundation for the scientific utilization of Chinese herbal medicine resources. By replacing the conventional titanium dioxide(TiO2) nanomaterials with the P25(the 25 nm anatase and rutile mixed phase titanium dioxide material), the graphitic carbon nitride(g-C3N4)/P25 nanocomposite-based sensitive visible light photoelectrochemical platform has been reported herein. In this system, not only the large planar of g-C3N4 can serve as a highly-dispersed carrier for the TiO2 nanomaterials, but also its highly efficient carrier transport capability can endow the composite material with excellent photoelectronchemical performance. The sensitization effect of g-C3N4 with a mass ratio of only 0.5% is the best, and the photocurrent response signal of the composite material can be increased by 4.5-fold when compared with the conventional TiO2 nanomaterials. A good photoelectrochemical signal response can still be obtained under the open circuit potential, which provides a research basis for the construction of the two-electrode system. In comparison with previous reports, the photoelectrochemical strategy not only greatly simplifies the preparation process and reduces the cost, but also effectively improves the visible light utilization efficiency. This method was used for the first time to evaluate the antioxidant capacity of traditional Chinese herbal medicines which provided a new avenue for quantifying the antioxidant performance evaluation of traditional Chinese herbal medicines.

Key words: Antioxidant, Carbon nitride, Titanium dioxide, Photoelectrochemistry, Traditional Chinese herbal medicine

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