Table 3.
Major absorption bands observed in the functional group region of the selected medicinal plants’ parts’ FTIR spectra.
| Medicinal Plants | Absorption Peak (cm−1) (Vibration Type) | Functional Group Assignment |
|---|---|---|
| Studied part with medicinal food plant applications | ||
| A. cepa | 1547.59 (N-O bend); 1623.79 (N-H bend); 2852.11 (C-H stretch); 2920.24 (C-H stretch); 3273.70 (O-H stretch) |
Nitro compound; Primary amine; Alkyl group; Alkyl group; Alcohol |
| S. aromaticum | 1512.25 (N-O bend); 1607.42 (C=C bend); 1637.28 (N-H bend); 1731.54 (C=O bend); 2853.17 (C-H stretch); 2925.13 (C-H stretch); 3004.02 (C-H stretch); 3078.29 (N-H stretch); 3384.16 (O-H stretch) |
Nitro compound; Diene; Primary amine; Aldehyde; Alkyl group; Alkyl group; Alkyl group; Secondary amine; Alcohol |
| T. tetraptera | 1623.75 (C=C bend); 2854.79 (C-H stretch); 2924.86 (C-H stretch); 299.24 (C-H stretch); 3273.37 (O-H stretch); 3310.40 (O-H stretch); 3405.13 (O-H stretch) |
Diene; Alkyl group; Alkyl group; Vinyl group; Alcohol; Alcohol; Alcohol |
| Z. officinale | 1553.06 (C=O bend); 1640.08 (N-H bend); 2926.48 (C-H stretch); 3276.83 (O-H stretch) |
Carboxylic acid/derivative; Primary amine; Alkyl group; Alcohol |
| Studied part used solely for medicinal applications | ||
| A. ringens | 1627.92 (N-H bend); 2853.37 (C-H stretch); 2885.68 (C-H stretch); 2926.30 (C-H stretch); 3251.78 (O-H stretch); 3312.25 (O-H stretch) |
Primary amine; Alkyl group; Alkyl group; Alkyl group; Alcohol; Alcohol |
| M. indica | 1510.35 (N-O bend); 1611.55 (N-H bend); 2922.77 (C-H stretch); 3303.05 (O-H stretch) |
Nitro compound; Primary amine; Alkyl group; Alcohol |
| P. biglobosa | 1540.32 (N-O bend); 1611.77 (N-H bend); 1729.74 (C=O bend); 2849.23 (C-H stretch); 2917.09 (C-H stretch); 3280.68 (O-H stretch) |
Nitro compound; Primary amine; Aldehyde; Alkyl group; Alkyl group; Alcohol |
| P. nitida | 1647.63 (C=C bend); 2853.82 (C-H stretch); 2922.75 (C-H stretch); 3276.53 (O-H stretch) |
Alkene; Alkyl group; Alkyl group; Alcohol |