Relevance and Standardization of In Vitro Antioxidant Assays: ABTS, DPPH, and Folin–Ciocalteu

Table 3

Values of the Pearson correlation coefficient for correlation between AOPs determined in different antioxidant assays.

		DPPH^·				ABTS˙^+
		MeOH	H2O	pH 5	pH 7.4	H2O	pH 5	pH 7.4
DPPH˙	H2O	0.997
	pH 5	0.982	0.993
	pH 7.4	0.877	0.887	0.909
ABTS˙^+	H2O	0.950	0.968	0.985	0.872
	pH 5	0.954	0.972	0.985	0.853	0.997
	pH 7.4	0.964	0.979	0.987	0.858	0.990	0.997
FC		0.796	0.816	0.856	0.958	0.847	0.821	0.820

Values are significant at the α =0.001 level; values are significant at the α =0.01; values are significant at the α =0.05 level.