Table 1.

Assignment of absorption bands in the FTIR spectra of extracts.

Ep	Es	Et	Vibration Type	Ref.
3433	3440	3427	H–O stretching intermolecular hydrogen bonding from alcohols or phenols	[45]
2929, 2364	2924, 2854	2927, 2362	C–H stretching vibrations of CH3 and CH2 (alkanes)	[45,46]
1629	1614	1616	Stretching vibrations C=O, C–N (amide I), asymmetrical stretching vibrations COO-	[46]
1516	1519	1523	Deformation vibrations n-H (amide II) and aromatic bonds	[46]
1408, 1307	1408, 1375	1444, 1402	C–O (amide) stretching vibrations and C–C stretching vibrations of phenyl groups, COO- symmetric stretching vibrations and CH2 bond vibrations	[46]
1265	1259	1284, 1259	C–O stretching vibrations of alcohols, ethers, esters, carboxylic acids	[45]
1060	1060	1056	C–O and C–C stretching vibrations from carbohydrates	[46]
923–621	921–520	923–630	Bond vibrations C–H out of plane (alkenes)	[45,46]