The two oil bodies emulsion preparations of LSE and LSEF used in the present study were analyzed by the conventional peroxide value (PV) test (Table 7). As expected and in agreement with previous reports (Goyal et al., 2015), the two fresh oil bodies emulsions (T 0h) show a low PV value of about 3 meq/kg. After 96 h of thermal heating conditions of 55oC only a very small increase of PV of about 5 meq/kg was obtained for the two oil body emulsions. This data is also supported by the GC-MS results showing minimal changes of fatty acids profile of LSE and LSFE during thermal heating (not shown). These PV results well correlate with all the previous data in this study. Furthermore, this small increase of PV may confirm the ability of rapid non-destructive NMR energy relaxation time sensor application to monitor oxidation in complex materials as demonstrated in the present study. In addition considering the reports of emulsion preparation stability at low refrigerated conditions (4-7 oC) (Goyal et al., 2015), the natural linseed oil bodies emulsion preparations encapsulation PUFA-rich components including fish oil shown seems to be relatively stable with high oxidant resistance even under high thermal oxidizing conditions.
Table 7 : Peroxide values (PV, meqO2/kg) of fresh LSE and LSFE and after thermal conditions (55oC).