Foaming Properties of Monoglycerol Fatty Acid Esters in Nonpolar Oil Systems
| Autor: | Kenji Aramaki, Hiroyuki S. Kato, Yoshihiko Takase, Lok Kumar Shrestha, Hironobu Kunieda |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
chemistry.chemical_classification
Wax Chromatography Liquid paraffin Fatty acid Surfaces and Interfaces Monoglyceride Condensed Matter Physics chemistry.chemical_compound Squalene chemistry Squalane visual_art parasitic diseases Electrochemistry Glycerol visual_art.visual_art_medium Organic chemistry lipids (amino acids peptides and proteins) General Materials Science Spectroscopy Alkyl |
| Zdroj: | Langmuir. 22:8337-8345 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Foaming properties of monoglycerol fatty acid esters that have different alkyl chain lengths were studied in different nonpolar oils, namely liquid paraffin (LP 70), squalane, and squalene. The effect of the hydrocarbon chain length of the surfactant, the concentration, the nature of the oil, and the temperature on the nonaqueous foam stability was mainly studied. Five weight percent of glycerol alpha-monododecanoate (monolaurin) formed highly stable foams in squalane at 25 degrees C, and the foams were stable for more than 14 h. Foam stability of the monolaurin/LP 70 and the monolaurin/squalene systems are almost similar, and the foams were stable for more than 12 h. Foam stability was decreased as the hydrocarbon chain length of the monoglyceride decreased. In the glycerol alpha-monodecanoate (monocaprin)-oil systems, the foams were stable only for 3-4 h, depending on the nature of the oil. However, the foams formed in the glycerol alpha-monooctanoate (monocaprylin)-oil systems coarsened very quickly, leading to the progressive destruction of foam films, and all of the foams collapsed within a few minutes. Foam stability decreased when the oil was changed from squalane to squalene, in both monocaprin and monolaurin systems. It was observed that, in the dilute regions, these monoglycerides form fine solid dispersions in the aforementioned oils at 25 degrees C. At higher temperatures, the solid melts to isotropic single-liquid or two-liquid phases and the foams formed collapsed within 5 min. Judging from the wide-angle X-ray scattering (WAXS) and the foaming test, it is concluded that the stable foams are mainly caused by the dispersion of the surfactant solids (beta-crystal) and foam stability is largely influenced by the shape and size of the dispersed solid particles. |
| Databáze: | OpenAIRE |
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