As shown in Fig.1, at the beginning of the reaction, there
were not significant differences among those groups,
which might be caused by the limited amounts of peroxides
as the free radicals were being formed during the
inducing period of the oxidation reaction. Then the
amounts of peroxides increased with the increase of peroxide
value as the reaction proceeding. The pigment’s
effect on antioxidant was confirmed that all of the POV
of assay groups were lower than the blank one (0.00 mg
mL-1 sample). The POV of blank sample exceeded standard
of GB10146-2005 (Standardization Administration
of the People’s Republic of China 2005) at the 6th day,
while the pigment samples in 0.01, 0.05 and the 0.1 mg
mL-1 Vc sample at the 8th day, and the pigment samples
in 0.1 and 0.5 mg mL-1 at the 12th day and 16th day,
respectively, and the pigment’s antioxidant capacity was
higher than Vc when its concentration exceeded 0.1 mg
mL-1. Those data showed the anti-lipid peroxidation capacity
increased with the increase of pigment concentration
and the pigment could efficiently prolong the lard’s
shelf life and prevent its oxidant.