Table 1.

Assignment of absorption signals in FT-IR spectrum of krill oil reference sample [1,36,37].

Peak Variable	Wavenumber (cm−1)	Functional Group	Mode of Vibration
I1	3010	=C–H (cis-)	Stretching
I2	2958	–C–H (CH3)	Stretching (asym)
I3	2924	–C–H (CH2)	Stretching (asym)
I4	2853	–C–H (CH2)	Stretching (sym)
I5	1745	–C=O (ester)	Stretching
I6	1654	–C=C– (cis-)	Stretching
I7	1466	–C–H (CH2, CH3)	Bending (scissoring)
I8	1419	=C–H (cis-)	Bending (rocking)
I9	1395	=C–H (cis-)	Bending
I10	1377	–C–H (CH3)	Bending (sym)
I11	1236	PO2− (diester)	Stretching (asym)
I12	1167	–C–O–P (ester)	Stretching (sym)
I13	1090	PO2− (diester)	Stretching (sym)
I14	1060	–C–O–P (ester)	Stretching (asym)
I15	970	–N–(CH3)3	Stretching (asym)