title: Antioxidant activity evaluation by physiologically relevant assays based on haemoglobin peroxidase activity and cytochrome c-induced oxidation of liposomes.
abstract: Two new protocols for exploring antioxidant-related chemical composition and reactivity are described: one based on a chronometric variation of a haemoglobin ascorbate peroxidase assay and one based on cytochrome c-induced oxidation of lecithin liposomes. Detailed accounts are given on their design, application, critical correlations with established methods and mechanisms. These assays are proposed to be physiologically relevant and bring new information regarding a real sample, both qualitative and quantitative. The well-known assays used for evaluation of antioxidant (re)activity are revisited and compared with these new methods. Extracts of the Hedera helix L. are examined as test case, with focus on seasonal variation and on leaf, fruit and flower with respect to chromatographic, spectroscopic and reactivity properties. According to the set of assays performed, winter are the most antioxidant, followed by summer leaves, and then by flowers and fruits.
authors.affiliation: a Department of Chemistry and Chemical Engineering , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Augustin C
authors.initials: AC
authors.lastname: Mot
authors.affiliation: a Department of Chemistry and Chemical Engineering , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Cristina
authors.initials: C
authors.lastname: Bischin
authors.affiliation: a Department of Chemistry and Chemical Engineering , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Bianca
authors.initials: B
authors.lastname: Muresan
authors.affiliation: b Department of Biology and Geology , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Marcel
authors.initials: M
authors.lastname: Parvu
authors.affiliation: c Department of Physics , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Grigore
authors.initials: G
authors.lastname: Damian
authors.affiliation: d Department of Pharmaceutical Technology and Biopharmaceutics , "Iuliu Hatieganu" University of Medicine and Pharmacy , Cluj-Napoca RO-400010 , Romania.
authors.forename: Laurian
authors.initials: L
authors.lastname: Vlase
authors.affiliation: a Department of Chemistry and Chemical Engineering , "Babes-Bolyai" University , Cluj-Napoca RO-400084 , Romania.
authors.forename: Radu
authors.initials: R
authors.lastname: Silaghi-Dumitrescu
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D001681:Biological Assay / Q000379:methods; D045304:Cytochromes c / Q000494:pharmacology; D035264:Flowers / Q000737:chemistry; D005638:Fruit / Q000737:chemistry; D006454:Hemoglobins; D006801:Humans; D008081:Liposomes / Q000737:chemistry*; D010084:Oxidation-Reduction / Q000187:drug effects; D010544:Peroxidases / Q000378:metabolism*; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D012621:Seasons
chemical_list: D000975:Antioxidants; D006454:Hemoglobins; D008081:Liposomes; D010936:Plant Extracts; D045304:Cytochromes c; D010544:Peroxidases
keywords: Antioxidant (re)activity assays; Hedera helix; haemoglobin ascorbate peroxidase assay; liposome peroxidation; principal component analysis