title: Antioxidant Properties of 2-Hydroxyethyl Methacrylate-Based Copolymers with Incorporated Sterically Hindered Amine.
abstract: A series of model linear copolymers of 2-hydroxyethyl methacrylate (HEMA) and a sterically hindered amine derivative [N-(2,2,6,6-tetramethyl-piperidin-4-yl)methacrylamide (HAS)] were synthesized and characterized. Scavenging activities of the copolymers against reactive oxygen species (peroxyl and hydroxyl radicals) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals were determined. It was found that copolymers with medium HAS content (3.5-4.0 mol %) were better scavengers than copolymers with lower and higher HAS content and also than polyHEMA and polyHAS homopolymers and the HAS monomer. Importantly, these copolymers compared favorably even to established low-molecular weight antioxidant standards (BHA and dexpanthenol). Monomer reactivity ratios were determined, and the microstructure of the copolymers was assessed. Subsequently, cross-linked copolymers in the powder and film forms with optimal HAS content were synthesized. Their scavenging activities against the three types of radicals were determined, revealing that these hydrogels are potent scavengers of reactive oxygen species.
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: L
authors.initials: L
authors.lastname: Poláková
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Raus
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: L
authors.initials: L
authors.lastname: Kostka
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: A
authors.initials: A
authors.lastname: Braunová
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Pilař
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Lobaz
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Pánek
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic.
authors.forename: Z
authors.initials: Z
authors.lastname: Sedláková
mesh_terms: D016166:Free Radical Scavengers / Q000138:chemical synthesis / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry*; D017382:Reactive Oxygen Species / Q000737:chemistry*
chemical_list: D016166:Free Radical Scavengers; D008689:Methacrylates; D017382:Reactive Oxygen Species; C005044:hydroxyethyl methacrylate