Open Access
Table 1.
Positioning of FTIR absorption maxima with assignment of appropriate vibrations in bio fuels tested (for the methyl esters of sunflower oil after frying French fries, fish and for commercial esters-B100 recorded within the range of 3700-900 cm-1.)
| FTIR | Type and origin of vibrations | ||
|---|---|---|---|
| Position of bands [cm-1] Esters of sunflower oil | B100 | ||
| 3351w | 3351st | – | v (O-H) in H2O |
| 3009 | 3009 | 3011 | v(C-H) |
| 2932 | 2932 | 2920 | v(C-H)CH2, s+as, CH3, s+asaliphatic group of triglycerides |
| 2861 | 2861 | 2920 | |
| 1744st | 1744st | 1742s | C=O group of Ester |
| 1715 | – | – | |
| 1659 | 1659 | 1653 | v(C=C) |
| 1553 | 1553 | – | v(C=C)s |
| 1460 | 1460 | 1462 | -C-H (in CH2) bending |
| 1434 | 1434 | 1436 | |
| 1417 | 1417 | 1418 | =C-H (cis-) bending |
| 1404m | 1404m | 1403m | v (=C-H (cis-)) |
| 1376 | 1376 | 1377 | -C-H s (in CH3) |
| 1365 | 1365 | 1360 | -C-H s (CH3) bending |
| 1317 | 1317 | 1319 | δ(CH) |
| 1277st | 1277st | 1276m | δ(CH2) |
| 1245 | 1245 | 1245 | -C-O stretching |
| 1197 | 1197 | 1169 | or -O-CH2-C |
| 1170 | 1170 | 1194 | -C-O |
| 1116 | 1116 | 1119 | v(C-C) |
| 1132 | 1132 | 1117 | |
| 914m | 914m | 910m | -OH |
| 860 | 860 | 859 | v(C-O-C)s |
| 839st | 839st | 840w | v(C-O-C)s or v(C-C) |
| 721 | 721 | 722 | -CH2- rocking |
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