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Table 2 EC50 values obtained in the DPPH assay for authentic samples of tea constituents and the standard antioxidant

From: Extraction Kinetics of phytochemicals and antioxidant activity during black tea (Camellia sinensis L.) brewing

Compound EC50 for DPPH Assay
Gallic acid 1.38 ± 0.04 μg/ml
Epicatechin 2.30 ± 0.06 μg/ml
Epigallocatechin gallate 3.24 ± 0.07 μg/ml
L-Ascorbic acid 3.30 ± 0.27 μg/ml
Caffeine >1.25 mg/ml