Authentication of Nigella sativa Seed Oil in Binary and Ternary Mixtures with Corn Oil and Soybean Oil Using FTIR Spectroscopy Coupled with Partial Least Square

Table 1

Functional groups and mode of vibration from FTIR spectra of the evaluated oils [19, 20].

Marker	Peak position of FTIR spectra (cm^−1)	Assignment of bands	Mode of vibration
(a)	3009	C=CH (cis)	Stretching
(b) and (c)	2922 and 2852	–CH (CH3)	Stretching asymmetric
(d)	1742	–C=O (ester)	Stretching
(e)	1658	–C=C (cis)	Stretching
(f)	1461	–C–H (CH2)	Bending (scissoring)
(g)	1378	–C–H (CH3)	Bending symmetric
(h) and (i)	1235 and 1161	C–O (ester)	Stretching
(j) and (k)	1118 and 1098	C–O	Stretching
(l)	964	trans–CH=CH–	Bending out of plane
(m)	914	trans–CH=CH–	Bending out of plane
(n)	871	trans–CH=CH–	Bending out of plane
(o)	844	trans–CH=CH–	Bending out of plane
(p)	721	cis–CH=CH–	Bending out of plane
(q)	1715	–C=O	Stretching