Effects of droplet size on the oxidative stability of oil-in-water emulsions
| Autor: | Hideki Ushio, Shingo Matsukawa, Kyoko Nakaya, Toshiaki Ohshima, Masataka Shimizu |
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| Rok vydání: | 2005 |
| Předmět: |
endocrine system
food.ingredient Analytical chemistry Cod Liver Oil Oxidative phosphorylation Biochemistry Hexanal Soybean oil Oil in water chemistry.chemical_compound food Drug Stability Particle Size Droplet size Nuclear Magnetic Resonance Biomolecular Organic Chemistry technology industry and agriculture Water Cell Biology eye diseases Peroxides chemistry Oil droplet Emulsion Proton NMR Emulsions Oils Oxidation-Reduction |
| Zdroj: | Lipids. 40(5) |
| ISSN: | 0024-4201 |
| Popis: | The effects of droplet size and emulsifiers on oxidative stability of polyunsaturated TAG in oil-in-water (o/w) emulsions with droplet sizes of 0.806 +/- 0.0690, 3.28 +/- 0.0660, or 10.7 +/- 0.106 microm (mean +/- SD) were investigated. Hydroperoxide contents in the emulsion with a mean droplet size of 0.831 microm were significantly lower than those in the emulsion with a mean droplet size of 12.8 microm for up to 120 h of oxidation time. Residual oxygen contents in the headspace air of the vials containing an o/w emulsion with a mean droplet size of 0.831 microm were lower compared with those of the emulsion with a mean droplet size of 12.8 microm. Hexanal developed from soybean oil TAG o/w emulsions with smaller droplet size showed significantly lower residual oxygen contents than those of the larger droplet size emulsions. Consequently, oxidative stability of TAG in o/w emulsions could be controlled by the size of oil droplet even though the origins of TAG were different. Spin-spin relaxation time of protons of acyl residues on TAG in o/w emulsions measured by H NMR suggested that motional frequency of some acyl residues was shorter in o/w emulsions with a smaller droplet size. The effect of the wedge associated with hydrophobic acyl residues of emulsifiers was proposed as a possible mechanism to explain differences in oxidative stability between o/w emulsions with different droplet sizes. |
| Databáze: | OpenAIRE |
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