title: Structure-antioxidant activity relationships of o-hydroxyl, o-methoxy, and alkyl ester derivatives of p-hydroxybenzoic acid.
abstract: Anti-DPPH radical effect as well as anti-peroxide activity of o-hydroxyl, o-methoxy, and alkyl ester derivatives of p-hydroxybenzoic acid in a bulk fish oil system and its O/W emulsion were investigated. Electronic phenomena, intra- and/or intermolecular hydrogen bonds, interfacial properties, and chemical reaction of the solvent molecules with phenolic compounds were considered to be mainly involved in the antiradical activities observed. Antioxidant activity of the phenolic acids derivatives as a function of these factors was variously affected by the environmental conditions which may occur in practice.
authors.affiliation: Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Food Science and Technology, P.O. Box 91775-1163, Mashhad, Iran. Electronic address: rfarhoosh@um.ac.ir.
authors.forename: Reza
authors.initials: R
authors.lastname: Farhoosh
authors.affiliation: Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Food Science and Technology, P.O. Box 91775-1163, Mashhad, Iran.
authors.forename: Saeed
authors.initials: S
authors.lastname: Johnny
authors.affiliation: Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Food Science and Technology, P.O. Box 91775-1163, Mashhad, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Asnaashari
authors.affiliation: Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Food Science and Technology, P.O. Box 91775-1163, Mashhad, Iran.
authors.forename: Najme
authors.initials: N
authors.lastname: Molaahmadibahraseman
authors.affiliation: Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Food Science and Technology, P.O. Box 91775-1163, Mashhad, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Sharif
mesh_terms: D000975:Antioxidants; D062385:Hydroxybenzoates / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D010226:Parabens / Q000737:chemistry*; D013329:Structure-Activity Relationship
chemical_list: D000975:Antioxidants; D062385:Hydroxybenzoates; D010226:Parabens; D017665:Hydroxyl Radical; C017616:phenolic acid; C038193:4-hydroxybenzoic acid
keywords: Antioxidant activity; Emulsion; Kilka fish oil; Polar paradox theory; p-Hydroxybenzoic acid