Table 1.
Examples of NIR absorption bands [29].
| Wavelength (nm) | Wavenumber (cm−1) | Assignment |
|---|---|---|
| Water | ||
| 1454 | 6878 | 1st overtone O–H stretching |
| 1932 | 5176 | O–H combination |
| Proteins | ||
| 1208 | 8278 | 2nd overtone C–H stretching |
| 1465 | 6826 | 1st overtone N–H and O–H stretching |
| 1734 | 5767 | 1st overtone C–H stretching |
| 1932 2058 2180 |
5176 4859 4587 |
N–H combination and O–H stretching |
| 2302 2342 |
4344 4270 |
C–H stretching combination |
| Oil | ||
| 1210 | 8264 | 2nd overtone C–H stretching |
| 1406 | 7112 | 1st overtone N–H and O–H stretching |
| 1718 1760 |
5821 5682 |
1st overtone C–H stretching |
| 2114 | 4730 | N–H combination and O–H stretching |
| 2308 2346 |
4333 4263 |
C–H stretching combination |
| Starch | ||
| 1204 | 8306 | 2nd overtone C–H stretching |
| 1464 | 6831 | 1st overtone N–H and O–H stretching |
| 1932 2100 |
5176 4762 |
N–H combination and O–H stretching |
| 2290 2324 |
4367 4303 |
C–H stretching combination |