Table 1.
Assignment of bulk 1H NMR signals of major acylglycerol groups present in the 1H NMR profiles of PDMS-treated sunflower oil, including chemical shift values, multiplicities, and their associated functional groups.
| Functional group | ||||
|---|---|---|---|---|
| Signal | δ-scale (ppm) | Multiplicity | Condensed function | Classification |
| A | 0.836–0.929 | t | –CH3 | Saturated, oleoyl and linoleoyl acyl groups |
| B | 1.201–1.407 | t | –(CH2)n– | All acyl groups |
| C | 1.569–1.662 | m | –OCO–CH2-CH2- | Acyl groups except for those of DHA, EPA and ARA |
| D | 1.975–2.089 | m | –CH2-CH-CH– | All acyl groups except for DHA |
| E | 2.271–2.357 | dt | –OCO–CH2- | All acyl groups except for DHA |
| F | 2.743–2.798 | t | -HC–CH2-CH- | Diunsaturated ω-6 acyl groups |
| G | 4.109–4.336 | dd, dd | –CH2OCOR | Glyceryl backbone groups |
| H | 5.237–5.292 | m | >CHOCOR | Glyceryl backbone groups |
| I | 5.292–5.416 | m | –CH-CH– | Acyl chain olefinic functions |
d, doublet; t, triplet; m, multiplet; dd, doublet of doublets; dt, doublet of triplets; ω-6, omega-6 acyl groups; DHA, docosahexaenoyl acyl groups; EPA, eicosapentaenoyl acyl groups; ARA, arachidonoyl acyl groups. Letter assignments and characteristics correspond to those provided in Figure 1.