title: Antioxidant properties of 4-vinyl derivatives of hydroxycinnamic acids.
abstract: The compounds 4-vinylphenol (4-VP), 4-vinylguaiacol (4-VG), 4-vinylsyringol (4-VS) and 4-vinylcatechol (4-VC) were prepared by thermal decarboxylation of the corresponding hydroxycinnamic acids p-coumaric, ferulic, sinapic and caffeic acid, respectively. For confirmation of the synthesised products LC-MS followed by NMR analysis was used. To evaluate their antioxidant potential, their reducing power and efficiency in scavenging the alkylperoxyl radical generated in an emulsion system, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and the superoxide anion radical (O2(-)) were determined. All tested 4-vinyl derivatives revealed weaker antioxidant activity in a homogeneous polar medium than the corresponding phenolic acids. In the emulsion system the activity for 4-vinyl derivatives was higher than was the activity of their corresponding phenolic acids, with 4-VG as the most active among the tested phenolic compounds.
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia.
authors.forename: Petra
authors.initials: P
authors.lastname: Terpinc
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia.
authors.forename: Tomaž
authors.initials: T
authors.lastname: Polak
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia.
authors.forename: Nataša
authors.initials: N
authors.lastname: Segatin
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia.
authors.forename: Andrej
authors.initials: A
authors.lastname: Hanzlowsky
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia.
authors.forename: Nataša Poklar
authors.initials: NP
authors.lastname: Ulrih
authors.affiliation: Biotechnical Faculty, University of Ljubljana, SI-1111 Ljubljana, Slovenia. Electronic address: helena.abramovic@bf.uni-lj.si.
authors.forename: Helena
authors.initials: H
authors.lastname: Abramovič
keywords: 4-Vinylcatechol; 4-Vinylguaiacol; 4-Vinylphenol; 4-Vinylsyringol; Antioxidant activity; Hydroxycinnamic acids