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Table 2 Functional groups of Lactococcus lactic subsp. lactis without 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.

3279.57

53.07

Bound hydroxy groups (OH) and primary and secondary amines and amides stretching (N–H) group

2.

2929.77

58.65

ν(C–H) asymmetric stretching

3.

1640.09

41.85

ν(P–H) stretching

4.

1543.60

45.67

ν(C≡C) groups

5.

1404.60

52.41

ν(COOR) ester group

6.

1228.32

48.62

ν(C=O) bonded to amide I

7.

1039.39

41.79

ν(N–H) bonded to amide II

8.

641.86

37.84

ν(S=O) sulfamide bonds