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. 2019 Dec 19;9(1):5. doi: 10.3390/antiox9010005

Table 2.

The lengths of induction periods, τ, the rates of initiation, Ri, the slow-down factor (Rox/Rinh, the ratio of the rate of non-inhibited process to the rate of inhibited process), and the inhibition rate constants, kinh, calculated for autoxidation of 2.74 mM MeLin dispersed in Triton X-100 micelles (8 mM) and in liposomes (20.2 mM), inhibited by 1 µM PMHC, 1 µM Trolox, or 1B (equivalent of 1 µM PMHC, calculated from TG measurements). In both systems, the experiments were performed at 37 °C and pH 7.0. Peroxidation was initiated by 10 mM ABAP. Each measurement was run 4–6 times. Values are expressed as the mean ± standard deviation (SD).

Experimental System τ/min Ria/nMs−1 Rinh/nMs−1 R ox /R inh b 10−3 × kinh/M−1 s−1
micelles
PMHC 7.6 ± 0.7 4.4 ± 0.4 37 ± 5 9.0 18.8 ± 3.8
Trolox 9.6 ± 0.4 4.4 ± 0.4 47 ± 8 7.4 4.5 ± 0.9
1B 9.3 ± 0.6 4.4 ± 0.4 87 ± 5 4.0 2.2 ± 0.4
liposomes
PMHC 8.6 ± 0.6 3.8 ± 0.4 20 ± 6 5.0 13.9 ± 2.7
Trolox 8.7 ± 0.3 3.8 ± 0.4 24 ± 2 4.2 13.4 ± 2.7
1B - 3.8 ± 0.4 67 ± 3 c 1.5 -

a For Ri determination, see Equation 8 in Section 3.2. bThe (Rox/Rinh) ratio informs how many times the inhibited oxidation is slower than spontaneous (non-inhibited) process. It can be also considered as the ratio of the kinetic chain length (the number of propagating cycles) of the inhibited to non-inhibited process. c For this system, the inhibition period was not detected (See curve d in Figure 4B) and the rate of the retarded process is listed.