of aliphatic CAH in CH2 and terminal CH3 groups; the strong single
peak of the C@O stretching vibration of carbonyl groups of the triglycerides
is observed at about 1745 cm1
; the extremely weak
band near 1654 cm1 corresponds to the stretching vibration of
the C@C group of cis-olefins; bands in the 1400–1200 cm1 region
are mainly attributed to bending vibrations of CH2 and CH3 aliphatic
groups like symmetric HCH bending at 1377 cm1 and
CH2 scissoring at 1462 cm1
; bands in the 1125–1095 cm1 region
correspond to the stretching vibration of CAO ester groups and CH2
wag; finally, below 1000 cm1
, the band near 723 cm1 is due to
the overlapping of the (CH2)n rocking vibration and the out of plane
K. Jav