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. 2022 Sep 7;12(9):1395. doi: 10.3390/life12091395

Table 6.

Positions of the IR absorption bands in the C. vulgaris and A. platensis carbohydrate complexes.

No. C. vulgaris A. platensis Theoretical Interpretation
Wavenumber, cm−1
1 - 750–850 Out-of-plane deformation vibrations of C–H bonds
2 1044 1050 Stretching vibration of C–C
3 1193 1190 Stretching vibration of carbonyl C–O groups
4 - 1200 Plane deformation vibrations of C–H
5 - 1253 Stretching vibration of O–H groups
6 1400–1700 1400–1650 Stretching vibrations of C=O, C=C bands, deformation vibrations of NH (δ(N–H))
7 - 2852 Symmetrical stretching vibrations of –CH2– (νs(CH2))
8 - 2925 Asymmetric stretching vibrations of –CH2– (νas(CH2))
9 2915,2940 - Stretching vibrations of –CH– (ν(CH))
10 3400 - Stretching vibrations of the hydroxyl group
11 - 3735 Stretching vibrations of N–H (ν(NH))