Fig. 4 Changes of LSO self-diffusion (D) trend at 25, 40, 60,
80, 100, 120oC during 168 h. (25 and 40oC designated
as Slow Ox, and 60 80, 100, 120oC designated as Rapid
Ox)
The D values in Fig. 4, at different times of LSO oxidation were
correlated in Fig 5 to the 1H LF-NMR
T2 mobility values of the LSO omega-3 PUFA-rich tail end
of the alkyl chains. As can be seen in Fig. 5, there is a good
correlation between the D and T2 values. Again the two
main autoxidation mechanisms can be observed. One mechanism at low
temperatures of oxidation is characterized by negative slope over the
168 h of oxidation, due to a slow oxidation rate of LSO. The second
oxidation mechanism at higher temperatures is characterized by a
positive slope for 168 h, due to a rapid oxidation rate of LSO. The
temperature of 60oC also shows a positive slope, but
more moderate than at higher temperatures. This last result supported
with correlation of self-diffusion vs. viscosity (supplemental
information 1) and T2 vs. viscosity (supplemental
information 2) further confirms that 60oC is the
temperature point for initiating a rapid LSO oxidation and aging.