title: Anti-peroxyl radical quality and antibacterial properties of rooibos infusions and their pure glycosylated polyphenolic constituents.
abstract: The anti-peroxyl radical quality of two aqueous rooibos infusions and solutions of their most abundant glycosylated polyphenols was evaluated using pyrogallol red and fluorescein-based oxygen radical absorbance ratios. It was observed that the artificial infusions, prepared using only the most abundant polyphenols present in rooibos and at concentrations similar to those found in the natural infusions, showed greater antioxidant quality than the latter infusions, reaching values close to those reported for tea infusions. Additionally, the antimicrobial activity of the natural and artificial infusions was assessed against three species of bacteria: Gram (+) Staphylococus epidermidis and Staphylococcus aureus and Gram (-) Escherichia coli. When compared to the natural infusions the artificial beverages did not demonstrate any bacterostatic/cidal activity, suggesting that the antibacterial activity of rooibos is related to compounds other than the glycosylated polyphenols employed in our study.
authors.affiliation: Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON K1N6N5, Canada.
authors.forename: Madeline J
authors.initials: MJ
authors.lastname: Simpson
authors.forename: Daisy
authors.initials: D
authors.lastname: Hjelmqvist
authors.forename: Camilo
authors.initials: C
authors.lastname: López-Alarcón
authors.forename: Nadja
authors.initials: N
authors.lastname: Karamehmedovic
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Minehan
authors.forename: Akop
authors.initials: A
authors.lastname: Yepremyan
authors.forename: Baback
authors.initials: B
authors.lastname: Salehani
authors.forename: Eduardo
authors.initials: E
authors.lastname: Lissi
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Joubert
authors.forename: Klas I
authors.initials: KI
authors.lastname: Udekwu
authors.forename: Emilio I
authors.initials: EI
authors.lastname: Alarcon
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D047310:Apigenin / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D036903:Aspalathus / Q000737:chemistry*; D001628:Beverages; D047188:Chalcones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010545:Peroxides; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D059808:Polyphenols / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D011794:Quercetin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D012431:Rutin / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects; D013212:Staphylococcus epidermidis / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D047188:Chalcones; D005419:Flavonoids; D016166:Free Radical Scavengers; D005960:Glucosides; D010545:Peroxides; D010936:Plant Extracts; D059808:Polyphenols; C517016:aspalathin; C528728:nothofagin; C016527:isoquercitrin; C049375:perhydroxyl radical; D012431:Rutin; D047310:Apigenin; C021304:hyperoside; D011794:Quercetin; C032731:vitexin; C065886:orientin
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