Rapid Determination of Catechin Content in Black Tea by Fluorescence Spectroscopy

Figure 4

Fluorescence emission of black tea solution (tea = 0.2 mg/mL) with an increase in catechin concentration. Catechin varied from 0 μg/mL to 10 μg/mL. A to B indicates increased concentrations of catechin. The fluorescence intensity of the mixed solution gradually increased with the increase of catechin concentration.