Research Strategies in the Study of the Pro-Oxidant Nature of Polyphenol Nutraceuticals

Figure 5

Comparative toxicities of epigallocatechin gallate (EGCG), theaflavin-3-digallate, and theaflavin-3′-gallate extract towards human oral HSC-2 carcinoma cells in the absence and presence of exogenously added catalase. Cell proliferation was quantified with the neutral red assay, a cell viability assay. Data are presented as the mean percent of control ± S.E.M. Data for EGCG are from Weisburg et al. [12] and for the black tea theaflavin monogallates are from Babich et al. [20].