Determination of caffeine content in tea based on poly(safranine T) electroactive film modified electrode

作者：Guo Sujuan; Zhu Qianqian; Yang Baocheng; Wang Jing; Ye Baoxian^*

来源：Food Chemistry, 2011, 129(3): 1311-1314.

DOI：10.1016/j.foodchem.2011.05.095

• Caffeine
• Poly(safranine T)
• Tea
• Voltammetry

Safranine T was electropolymerised on a glassy carbon electrode and then characterised by scanning electron microscope (SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS). This uniform electropolymerised film was crystallisable and showed a high electrocatalytic ability towards the oxidation of caffeine. To avoid the interferences of the anions, Nation was covered on the surface of poly(safranine T) film modified glassy carbon electrode. As a new voltammetric sensor, this modified electrode is sensitive, selective and stable to determine caffeine content in tea. The peak current increased linearly with the concentration of caffeine in the range of 3 x 10(-7)-1 x 10(-4) M, with a detection limit of 1 x 10(-7) M. All of these make it a useful tool for determining caffeine content in tea. What's more, it produces much less organic waste compared with other analytical techniques.

• 出版日期2011-12-1
• 单位郑州大学