Table 4. Fourier transform infrared spectroscopy (FTIR) band assignments for the main groups found in β-cyclodextrin (β-CD) and for the corresponding β-cyclodextrin / common bean oil complexes (β-CD/CBO-NE and β-CD/CBO-SW, respectively).
| Band assignment related to β-cyclodextrin | β-CD Wavenumber (cm-1) |
β-CD/CBO-NE complex Wavenumber (cm-1) |
β-CD/CBO-SW complex Wavenumber (cm-1) |
|---|---|---|---|
| ν (O-H) of water, stretching vibration of O-H from β-CD | 3292.98±0.00 | 3291.54±0.04 | 3291.68±0.10 |
| νas (C-H) stretching vibration of β-CD | 2924.74±0.94 | 2923.17±0.10 | 2923.21±0.26 |
| δ (O-H) bending vibration | 1645.39±1.04 | 1643.49±1.71 | 1644.33±1.72 |
| δ (O-H) in plane bending vibration | 1415.90±0.92 | 1414.44±0.46 | 1414.48±0.65 |
| δ (O-H) bending vibration | 1334.83±0.87 | 1330.74±0.03 | 1330.63±0.00 |
| νs (C-O-C) glucosydic stretching vibration | 1152.22±0.02 | 1154.20±0.04 | 1154.16±0.00 |
| ν (C-C) stretching vibrations | 1077.03±0.07 | 1079.87±0.03 | 1079.74±0.13 |
| ν (C-O) stretching vibrations | 1021.37±0.49 | 1024.36±0.01 | 1024.22±0.03 |
| ν (C-H) stretching vibrations from cyclodextrin ring | 938.26±0.34 | 937.78±0.00 | 937.77±0.02 |
| δ (C-C-H) bending of α-type glycosidic bond | 853.98±0.01 | 863.22±0.14 | 863.61±0.09 |
The wavenumbers corresponding to the band assignments are presented as the mean ± standard deviation (SD).