Table 1.
Experimental obtained data by different models about the antioxidant characteristics of the studied monomers and dimers.
experimental model | model 1 CLa |
model 2 lipidAOb |
model 3 ORACc |
|
kinetic parameters |
kAd [M−1s−1] |
PFe [—] |
IDf [—] |
RTEg [—] |
2 | (1.7 ± 0.1) × 104 | 3.5h,i | 6.3h,i | 3.12 ± 0.34 |
6 | (4.2 ± 0.3) × 104 | 13.5h,i | 29.3h,i | 3.04 ± 0.10 |
3 | (2.6 ± 0.2) × 104 | 3.5h | 5.5h | 3.85 ± 0.14 |
7 | (5.1 ± 0.3) × 104 | 5.8h | 8.8h | 2.97 ± 0.12 |
4 | (2.6 ± 0.2) × 104 | 5.8 | 9.8 | 5.60 ± 0.20 |
8 | (3.4 ± 0.2) × 104 | 12.8 | 11.0 | 5.22 ± 0.13 |
5 | (1.6 ± 0.1) × 104 | 3.2h | 4.4h | 2.56 ± 0.10 |
9 | (4.1 ± 0.3) × 104 | 3.3h | 4.2h | 1.98 ± 0.06 |
11 | (1.0 ± 0.1) × 106 | 21.2i | 29.3i | — |
aChlorobenzene as medium, ethylbenzene as oxidizing substrate, AIBN (2,2′-azobisisobutyronitrile) as initiator at 50 °C; btriacylglycerols of sunflower oil as oxidizing substrate, without an initiator, at 80 °C; cwater as medium, fluorescein (13) as substrate, AAPH (2,2'-azobisisobutyramidinium chloride) as initiator at 37 °C; drate constant kA value acquired from the slope of the CL time profile at the inflection point according to (dIrel/dt)max = 0.237(kA/(2kt)0.5)RIN; eantioxidant efficiency, determined as protection factor (PF = IPA/IPC), where IPA and IPC are the induction periods in the presence and in the absence of an antioxidant; fantioxidant reactivity as inhibition degree (ID = RC/RA), where RC and RA are the initial rates of lipid autoxidation in the absence and in the presence of the antioxidant; grelative Trolox equivalent (RTE) was calculated according to the following equation (AUC: area under curve) [(AUCSample − AUCBlank)/(AUCTrolox − AUCBlank)] × (molarity of Trolox/molarity of sample); hfrom [19]; ifrom [20].