Table 6.

IC₅₀ values (μM) determined against DPPH radicals applied in acetone or aqueous acetone after standard and modified reaction times (radical solution in methanol or acetone).

Antioxidant	50% Acn + MeOH 10 min	50% Acn + MeOH 30 min	50% Acn + MeOH 120 min	70% Acn + MeOH 30 min	Acn + MeOH 30 min	Acn 30 min
gallic acid	7.41	7.58	6.42	12.43	24.51	20.89
ferulic acid	42.04	33.65	30.81	77.83	221.09	1058.24
catechin	21.77	15.74	11.64	33.13	38.22	142.54
quercetin	11.35	9.31	8.83	31.50	26.79	V.N.D. 1
propyl gallate	10.62	9.79	8.49	13.99	15.78	19.53
glutathione	551.79	119.64	86.62	746.01	N.A. 2	N.A.
carnosine	N.D. 3	V.N.D.	V.N.D.	N.A.	N.A.	N.A.
cysteine	244.66	57.88	55.90	N.A.	N.A.	N.A.
histidine	N.D.	V.N.D.	V.N.D.	N.A.	N.A.	N.A.
ascorbic acid	29.96	30.04	29.69	39.69	N.A.	N.A.
ascorbyl palmitate	N.A.	N.A.	N.A.	42.85	32.15	36.48
α-tocopherol	N.A.	N.A.	N.A.	N.A.	33.77	35.98
Trolox	22.07	21.93	22.02	31.89	32.66	36.38
phenolic mixture	15.22	13.22	11.87	20.03	N.T. 4	N.T.
polar mixture	24.33	24.39	21.55	34.55	N.A.	N.A.

¹ V.N.D.—value not determined. ² N.A.—not applicable. ³ N.D.—activity not detected. ⁴ N.T.—not tested.