Formation of microemulsions with palm-based oils stabilized by a non-inonic surfactant.
There is growing interest to replace petroleum-based ingredients in products with natural-based materials such as palm oil and its derivatives. One of the potential uses of these 'natural materials is in microemulsion formulations. This paper describes the solubilization and ternary phase behaviour of palm oil and its derivatives with a non-ionic surfactant - coco alcohol (C12-14) ethoxylate with 6.9 moles of ethylene oxides (6.9EO) (also called Imbentin coco 6.9EO). The capacity of solubilization by 1mbentin coco 6.9EO for palm oil methyl esters (POME) tetradecane palm kernel oil-medium chain triglycerides (PKO-MCT) and palm olein. The phase inversion temperatures (PIT) for POME, PKO-MCT and palm olein were 59 GC, 70 GC and 71GC at 2:1, 1:1 and 0.5:1 ratios of oil to surfactant. The PIT for tetradecane, a petroleum-based oil, was 56 GC at 1:1 oil to surfactant ratio, but 73 GC at a 2:1 ratio.The capacities for solubilization and formation of a larger microemulsion region with PO ME were higher than those with PKO-MCT and palm olein in Imbentin coco 6.9EO systems. The maximum solubilities of PO ME and PKO-MCT were 2:1 and 1:1 oil to surfactant, both at 60 GC, and palm olein 0.5:1 oil to surfactant at 70 GC. We indicate that the POME molecules penetrate the liquid crystalline (LC) phase into the palisade layer. They then expand the LC (La) region and move to the water-rich axis. However, the micellar solution and/or O/W microemulsion can exist at up to 45 per cent (w/w) surfactant at the lower concentrations of PKOMCT and palm olein in the ternary systems.
| Principais autores: | , , |
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| Formato: | Texto biblioteca |
| Idioma: | ng |
| Assuntos: | Aceite de palma, Aceite de palmiste, ésteres metílicos, microemulsiones, solubilación, Surfactantes., Triglicéridos., |
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