Effect of emulsifier on oxidation properties of fish oil-based structured lipid emulsions.
The effects of the emulsifiers lecithin, Tween 20, whey protein isolate, mono-/diacylglycerols, and sucrose fatty acid ester on oxidation stability of a model oil-in-water emulsion prepared with enzymatically synthesized menhaden oil-caprylic acid structured lipid were evaluated. Oxidation was monitored by measuring lipid hydroperoxides, thiobarbituric acid reactive substances, and the ratio of combined docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) contents to palmitic acid in the emulsion. After high-pressure homogenization, all emulsions, except those prepared with lecithin, had similar droplet size distributions. All structured lipid emulsions, except for the lecithin-stabilized emulsions, were stable to creaming over the 48-day period studied. Emulsifier type and concentration affected oxidation rate, with 0.25% emulsifier concentration generally having a higher oxidation rate than 1% emulsifier concentration. Overall, oxidation did not progress significantly enough in 48 days of storage to affect DHA and EPA levels in the emulsion.
Fomuso
Lydia B
LB
Department of Food Science and Technology, Food Science Building, The University of Georgia, Athens, Georgia 30602-7610, USA.
Corredig
Milena
M
Akoh
Casimir C
CC
D004075:Diglycerides / Q000494:pharmacology; D004655:Emulsions / Q000737:chemistry*; D005395:Fish Oils / Q000737:chemistry*; D005989:Glycerides / Q000494:pharmacology; D015227:Lipid Peroxidation / Q000187:drug effects*; D008055:Lipids / Q000737:chemistry*; D008894:Milk Proteins / Q000494:pharmacology; D010084:Oxidation-Reduction; D010316:Particle Size; D010713:Phosphatidylcholines / Q000494:pharmacology; D011136:Polysorbates / Q000494:pharmacology; D013501:Surface-Active Agents / Q000494:pharmacology*; D000067816:Whey Proteins
D004075:Diglycerides; D004655:Emulsions; D005395:Fish Oils; D005989:Glycerides; D008055:Lipids; D008894:Milk Proteins; D010713:Phosphatidylcholines; D011136:Polysorbates; D013501:Surface-Active Agents; D000067816:Whey Proteins