Table 4 The location of the maxima of the FTIR absorption bands, with the assignment of particular vibrations to the respective samples: Dornfelder 2015, Hibernal 2017, Neuburger 2017, Pálava 2015, Pinot Gris 2015, Riesling presents all the 2015, Sauvignon 2017, Tramin 2015, Zweigeltrebe 2015 and Zweigeltrebe 2017, registered within the spectral range of 700–3600/cm.
FTIR | Type and origin of vibrations |
|---|---|
Positioning of band (/cm) | |
3494 | –C=Ow (overtone) and ν(=C–Hvw, trans-) |
3011 | ν(=C–Hm, cis-) |
2934 | νas(–C–Hvst, –CHa) and νs(–C–Hvst, –CHa) (aliphatic groups in triglycerides) |
2863 | |
1745 | ν(–C=Ovst) in esters |
1709 | ν(–C=Ovw) in acids |
1652 | νvw(–C=C–, cis-) |
1462 | δvw(–C–H) in CH2 and CH3 groups, deformation (scissor) |
1421 | νvw(–C–H, cis-) deformation (wagging) |
1374 | νw, m, vw(–C–H, –CH3) and deformation |
1348 | |
1315 | δm(–C–H, –CH3) |
1271 | νm(–C–O) or δm(–CH2–) |
1238 | |
1157 | νst(–C–O) or δst(–CH2–) |
1099 | νm,vw(–C–O) |
1027 | |
965 | δw(–HC=CH–, trans-) out-of-plane deformation |
905 | |
840 | δ(–(CH2)n– and –HC=CH– (cis-) deformation (scissor) |
807 | |
721 |
