Table 5. Parameters of DPPH˙ disappearance determined by first-order double-exponential model, total radical scavenging activity (RSA_T), radical scavenging activity during the first and second steps of reaction (RSA₁ and RSA₂ respectively) and antioxidant activity of tocopherol isomers involved in different steps of the reaction.

Oil sample	DPPH˙1	DPPH˙2	DPPH˙r	RSAT	RSA1	RSA2		Activity		Ratio of activities (B/A)
					%			A	B
CP1	0.376	0.365	0.246	74.07	38.08	37.02		0.060	1.473	24.51
CP2	0.336	0.431	0.230	76.75	33.71	43.24		0.040	1.505	37.40
RS1	0.357	0.277	0.366	63.41	35.71	27.72		0.033	0.342	10.37
RS2	0.294	0.338	0.368	63.21	29.40	33.82		0.065	0.159	2.46
RS3	0.312	0.342	0.350	65.36	31.05	34.09		0.042	0.085	2.02
RS4	0.264	0.293	0.442	55.75	26.44	29.31		0.032	0.131	4.10
RS5	0.290	0.297	0.410	58.69	29.08	29.77		0.047	0.125	2.65
S1	0.659	0.124	0.222	78.32	65.59	12.34		0.101	0.025	0.25
S2	0.553	0.273	0.177	82.54	55.10	27.22		0.255	0.045	0.18

A=activity of γ- and δ-tocopherols, calculated as (0.4·RSA₁)/(w(γ-tocopherol)+w(δ-tocopherol)), B=activity of α-tocopherol, calculated as (0.4·RSA₂)/w(α-tocopherol). DPPH˙₀, DPPH˙_t, DPPH˙₁, DPPH˙₂ and DPPH˙_r are the ratios of absorbance at the beginning of the experiment (at time t=0), at time t, steps 1 and 2 and remaining value, respectively