title: Highly unsaturated fatty acid might act as an antioxidant in emulsion system oxidized by azo compound.
abstract: Now it is recognized that DHA is oxidatively stable fatty acid compared with linoleic acid (LA) in emulsified system, although DHA is oxidatively unstable in a bulk system. In fact, an emulsified mixture of DHA and LA behaves as in a bulk system, namely the oxidative stability of DHA becomes lower than that of LA. Therefore, in this study, tridocosahexaenoate (DDD) and glycerol trilinoleate (LLL) were separately emulsified using TritonX-100 as an emulsifier and DDD emulsion was mixed with the oxidizing LLL emulsion using a water-soluble radical initiator, 2,2'-azobis(2-aminopropane) dihydrochloride. As a result, DHA suppressed the oxidation of LA, while DHA was not significantly oxidized. This suppression ability was examined using glycerol trieicosapentaenoate, glycerol trilinolenate, or glycerol trioleate instead of DDD and it was found that this activity was increased with the increasing number of double bonds in the structure. Furthermore, the same type of experiment was carried out using a lipid-soluble radical initiator, 2,2'-azobisisobutyronitrile and the similar result was obtained. These results indicated that a highly polyunsaturated fatty acid might act as an antioxidant in an emulsion system oxidized by an azo compound.
authors.affiliation: Department of Food Science and Technology, Tokyo University of Marine Science and Technology.
authors.forename: Naohiro
authors.initials: N
authors.lastname: Gotoh
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Noguchi
authors.forename: Akiko
authors.initials: A
authors.lastname: Ishihara
authors.forename: Kaita
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Hoyo
authors.initials: H
authors.lastname: Mizobe
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Nagai
authors.forename: Ikuko
authors.initials: I
authors.lastname: Otake
authors.forename: Kenji
authors.initials: K
authors.lastname: Ichioka
authors.forename: Shun
authors.initials: S
authors.lastname: Wada
mesh_terms: D000578:Amidines / Q000737:chemistry*; D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D004281:Docosahexaenoic Acids / Q000737:chemistry* / Q000302:isolation & purification; D004655:Emulsions; D019787:Linoleic Acid / Q000737:chemistry; D017830:Octoxynol / Q000737:chemistry; D012995:Solubility; D014280:Triglycerides / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000578:Amidines; D000975:Antioxidants; D004655:Emulsions; D014280:Triglycerides; D004281:Docosahexaenoic Acids; C046728:2,2'-azobis(2-amidinopropane); D017830:Octoxynol; D019787:Linoleic Acid; C009564:trilinolein