Table 1

Effect of neutral buffer treatment [Tris-HCl (pH 7.2)] on the IC50 of various plant polyphenolsa

CompoundWith incubationWithout incubation
EGCG0.38.5
Quercetin0.454.9
Myricetinndb2.1
Ellagic acidnd0.39
Pyrogallol rednd0.47
Epicatechin0.3>10.0
Gallic acid>10.0>10.0
  • a IC50 values were determined by duplicate measurements at four different concentration points.

  • b nd, not determined.