Table 1
Chemical properties of the surfactants (sorbitan esters) 108 used to prepare.
| Supplier name | Chemical name CAS no. | Molecular formula | HLB | Molecular weight (g.mol−1) | Visual aspect at 20 °C | Supplier |
|---|---|---|---|---|---|---|
| span 20® | Sorbitan monolaurate 1338-39-2 | C18H34O6 | 8.6 | 346.46 | viscous liquid | Sigma-Aldrich |
| span 40® | Sorbitan monopalmitate 26266-57-9 | C22H42O6 | 6.7 | 402.57 | powder | Koch-Light |
| span 60® | Sorbitan monostearate 1338-41-6 | C24H46O6 | 4.7 | 430.62 | powder | Koch-Light |
| span 65® | Sorbitan tristéarate 26658-19-5 | C60H114O8 | 2.1 | 963.54 | powder | Sigma-Aldrich |
| span 80® | Sorbitan monooleate 1338-43-8 | C24H44O6 | 4.3 | 428.6 | viscous liquid | Fluka |
| span 83® | Sorbitan sesquioléate 8007-43-0 | C66H126O16 | 3.7 | 1175.7 | viscous liquid | Sigma-Aldrich |
| span 85® | Sorbitan trioléate 26266-58-0 | C60H108O8 | 1.8 | 957.49 | viscous liquid | Sigma-Aldrich |