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Table 1 Functional groups of Lactococcus lactic subsp. lactis treated with cholesterol and the corresponding infrared absorption frequencies

From: In vitro assessment of hypocholesterolemic activity of Lactococcus lactis subsp. lactis

IR label Frequency (cm−1) Intensity Assignment
1. 3268.09 82.94 Bound hydroxy groups (OH) and primary and secondary amines and amides stretching (N–H) group
2. 2917.78 81.95 ν(C–H) asymmetric stretching
3. 2849.33 86.58 CH2 and CH3 symmetric stretching
4. 1641.28 69.35 ν(P–H) stretching
5. 1545.90 74.20 ν(C≡C) groups
6. 1396.21 81.65 ν(COOR) ester group
7. 1227.51 77 ν(C=O) bonded to amide I
8. 1039.37 67.15 ν(N–H) bonded to amide II
9. 626.44 63.76 ν(S=O) sulfamide bonds