The Effects of Different Extraction Methods on Antioxidant Properties, Chemical Composition, and Thermal Behavior of Black Seed (Nigella sativa L.) Oil

Table 6

The main peaks in the FTIR spectrum of Nigella sativa oils extracted by supercritical fluid of and cold press with their assignment.

Oil types	Peak (cm)	Functional group
SFE-CP	3482	Primary amines (-NH2 groups)
SFE-CP	2922, 2856	C-H stretching vibration (aliphatic) (CH3)
SFE-CP	1721	C=O stretching vibration (ester)
SFE-CP	1456, 1367.74	C-H bending vibration (aliphatic) (CH2)
SFE-CP	1166.48	C-O stretching vibration (ester)
SFE-CP	935.42, 717.35	trans-CH=CH-