Figure 1: HPLC-ECD chromatogram of flavonoids (catechins). Sample A was prepared by adding a mixture of tea catechins (50 mg/ml) to rat plasma. Sample B was a plasma sample (200 μL) prepared from blood obtained 1 h after oral administration of the catechin mixture (100 mg/kg). The catechin mixture contained EC 5.81%, GC 1.44%, ECG 12.51%, EGC 17.57% and EGCG 53.90%.