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

Table 2

Number of exchanged electrons () per OH group in different antioxidant assays.

Sample	/OH
	DPPH				ABTS			FC
	MeOH	H2O	pH 5	pH 7.4	H2O	pH 5	pH 7.4
CA	1.1	1.1	1.1	3.1	1.2	1.1	1.2	2.9
CGA	1.0	1.1	1.2	3.1	1.0	1.1	1.5	3.8
GA	1.8	2.1	2.1	1.7	2.1	2.7	3.5	1.9
CTH	0.8	1.0	1.4	2.1	1.4	1.7	2.0	2.3
EGCG	1.2	1.3	1.4	2.0	1.1	1.4	1.9	1.5
AA	0.9	0.9	0.9	1.0	0.9	0.9	0.9	2.1
Trolox	1.8	1.9	1.9	1.9	1.8	1.8	1.7	2.2