Detection of Total Phenol in Green and Black Teas by Flow Injection System and Unmodified Screen Printed Electrode

Figure 5

Recorder output of a routine run. From left to right, measurements in duplicate for gallic acid standard solution (50, 60, 70, 80, and 100 mg·L^-1) followed by signal of phenolic compounds EGCG (50 mg·L^-1), EC (50 mg·L^-1), GA (25 and 50 mg·L^-1), and different samples of tea.