title: Determination of caffeine content in tea based on poly(safranine T) electroactive film modified electrode.
abstract: 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, Nafion 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 3×10(-7)-1×10(-4)M, with a detection limit of 1×10(-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.
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
authors.forename: Sujuan
authors.initials: S
authors.lastname: Guo
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
authors.forename: Baocheng
authors.initials: B
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China. Electronic address: yebx@zzu.edu.cn.
authors.forename: Baoxian
authors.initials: B
authors.lastname: Ye
keywords: Caffeine; Poly(safranine T); Tea; Voltammetry