Research Article
Rapid Determination of Catechin Content in Black Tea by Fluorescence Spectroscopy
Figure 2
Three-dimensional fluorescence spectra of catechin monomer and different concentrations of tea solution. (a) Three-dimensional fluorescence spectrum of catechin monomer presents one characteristic excitation/emission (λex = 280 nm/λem = 310 nm) maximum. (b) 0.02 g/mL and (c) 0.2 mg/mL of black tea clear liquid. Comparing (b) with (c), it was found that the fluorescence peak of catechin was obvious at low concentration.
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