Table 7: The main wavelengths in the FTIR functional groups of LA and MEOA.

Wavelength of LAaWavelength of MEOAbFunctional group

30093009C=C bending vibration (aliphatic)
2927, 28552927, 2856C–H stretching vibration (aliphatic)
17191711C=O stretching vibration (carboxylic acid)
14541454C–H scissoring and bending for methylene group
12841284C–O stretching asymmetric (carboxylic acid)
937934C–H bending vibration (alkene)
820C–O–C oxirane ring
722723C–H group vibration (aliphatic)

Notes: Linoleic acid (a); 9(12)-10(13)-monoepoxy 12(9)-octadecanoic acid (b).