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FTIR of fruit wastes.
| IR frequencies (cm−1) |
Functional groups | ||
|---|---|---|---|
| Orange peels | Banana peels | Date stones | |
| 3424.96 | 3432.67 | 3435.56 | Alcohol (OH stretch) |
| 2928.38 | 2926.45 | – | Carboxylic acids (–OH) |
| 1636.30 | 1630.50 | 1636.30 | Amides (C O stretch) |
| 1411.64 | 1421.28 | 1429.96 | Alkane (–CH3) |
| 1051.98 | 1054.87 | 1050.50 | Alcohol (C-O stretch) |
| 612.288 | 620.002 | 616.15 | Alkynes (C-H bend) |
