title: Interaction of phosphatidylcholine and α-tocopherol on the oxidation of sunflower oil and content changes of phosphatidylcholine and tocopherol in the emulsion under singlet oxygen.
abstract: Interaction of phosphatidylcholine (PC) and α-tocopherol (α-Toc) on the oxidation of oil in the emulsion consisting of sunflower oil and water under singlet oxygen at 25 °C was studied by determining peroxide value (PV) and conjugated dienoic acid (CDA) contents. Singlet oxygen was produced by chlorophyll b under 1700 lux. Single addition of PC or α-Toc decreased the values of peroxides and CDAs of oil in the emulsion via singlet oxygen quenching. PC and α-Toc showed simply additive interaction in decreasing the singlet oxygen oxidation of oil in the emulsion. α-Toc was a physical quencher of singlet oxygen in the emulsion, but PC involved chemical quenching in the antioxidant action. Chlorophyll and PC contents were decreased in the emulsion under singlet oxygen, while α-Toc was not. α-Toc protected chlorophyll and PC from degradation, and was a more important component than PC in the oil oxidation under singlet oxygen in the emulsion.
authors.affiliation: Department of Food and Nutrition, Inha University, Incheon 402-751, Korea.
authors.forename: Yoosung
authors.initials: Y
authors.lastname: Lee
authors.forename: Eunok
authors.initials: E
authors.lastname: Choe
mesh_terms: D002734:Chlorophyll / Q000032:analysis / Q000528:radiation effects; D045703:Emulsifying Agents / Q000032:analysis / Q000737:chemistry; D004655:Emulsions; D005231:Fatty Acids, Unsaturated / Q000032:analysis / Q000737:chemistry; D005520:Food Preservatives / Q000032:analysis / Q000737:chemistry; D016166:Free Radical Scavengers / Q000032:analysis / Q000737:chemistry*; D006368:Helianthus / Q000737:chemistry; D008027:Light / Q000009:adverse effects; D008054:Lipid Peroxides / Q000032:analysis; D010084:Oxidation-Reduction; D010713:Phosphatidylcholines / Q000032:analysis* / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry* / Q000528:radiation effects; D012639:Seeds / Q000737:chemistry; D026082:Singlet Oxygen / Q000009:adverse effects*; D000074242:Sunflower Oil; D013997:Time Factors; D024502:alpha-Tocopherol / Q000032:analysis* / Q000737:chemistry*
chemical_list: D045703:Emulsifying Agents; D004655:Emulsions; D005231:Fatty Acids, Unsaturated; D005520:Food Preservatives; D016166:Free Radical Scavengers; D008054:Lipid Peroxides; D010713:Phosphatidylcholines; D010938:Plant Oils; D000074242:Sunflower Oil; D002734:Chlorophyll; D026082:Singlet Oxygen; C037184:chlorophyll b; D024502:alpha-Tocopherol