Table 2.
Assignment of bulk 1H NMR signals of minor compounds present in the 1H NMR profiles of PDMS-treated sunflower oil, including chemical shift values, multiplicities, and their associated functional group assignments.
| Functional group | ||||
|---|---|---|---|---|
| Signal | δ-scale (ppm) | Multiplicity | Condensed function | Classification |
| Q | 0.533–0.546 | s | –CH3 (C-18) | Δ7-Avenasterol |
| R | 0.677–0.690 | s | –CH3 (C-18) | β-Sitosterol, Δ5-Campesterol (or C-18 –CH3 Cholesterol) |
| S | 0.697–0.706 | s | –CH3 (C-18) | Δ5-Stigmasterol and Brassicasterol |
| T | 3.705–3.730 | d | –CH2OH | 1,2-Diacylglycerols |
s, singlet; d, doublet. Letter assignments and characteristics correspond to those provided in Figure 2.