Ascorbyl palmitate, gamma-tocopherol, and EDTA affect lipid oxidation in fish oil enriched salad dressing differently.
The aim of the study was to investigate the ability of gamma-tocopherol, ethylenediaminetetraacetate (EDTA), and ascorbyl palmitate to protect fish oil enriched salad dressing against oxidation during a 6 week storage period at room temperature. The lipid-soluble gamma-tocopherol (220 and 880 microg g-1 of fish oil) reduced lipid oxidation during storage by partly retarding the formation of lipid hydroperoxides (PV) and by decreasing the concentrations of individual volatile oxidation products by 34-39 and 42-66%, respectively. EDTA (10 and 50 microg g-1 of dressing) was the most efficient single antioxidant, and overall peroxide values and volatiles were reduced by approximately 70 and 77-86%, respectively. Conversely, prooxidant effects were observed with a high concentration of ascorbyl palmitate (300 microg g-1 of fish oil), whereas a low concentration was slightly antioxidative (50 microg/g of fish oil). Finally, a combination of all three antioxidants completely inhibited oxidation during storage, indicating that the prooxidant effects of ascorbyl palmitate were reverted or overshadowed by EDTA and gamma-tocopherol.
Let
Mette B
MB
Department of Seafood Research, Danish Institute for Fisheries Research, and Bioprocess Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Jacobsen
Charlotte
C
Meyer
Anne S
AS
D000975:Antioxidants / Q000494:pharmacology; D001205:Ascorbic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D003212:Condiments / Q000032:analysis; D004305:Dose-Response Relationship, Drug; D004492:Edetic Acid / Q000494:pharmacology*; D005395:Fish Oils / Q000737:chemistry*; D015227:Lipid Peroxidation / Q000187:drug effects*; D016877:Oxidants / Q000494:pharmacology; D024504:gamma-Tocopherol / Q000494:pharmacology*
D000975:Antioxidants; D005395:Fish Oils; D016877:Oxidants; D024504:gamma-Tocopherol; D004492:Edetic Acid; D001205:Ascorbic Acid; C031226:6-O-palmitoylascorbic acid