Infrared measurements showed that the reaction of quinone derivatives enzymatically generated from dopamine with carboxyl groups was an important factor to increase adhesive strength in addition to the formation of the p38 protein kinase grafted layers with a high water absorptivity. The above-mentioned results
suggested that enzymatically modified dilute chitosan solutions can be applied to an adhesive to bond polymer substrates. The emphasis is on the fact that water is used as a solvent for preparation of chitosan solutions and photografting without any organic solvents. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113:3963-3971, 2009″
“Inula viscosa is a perennial herbaceous plant used topically in folk medicine as an anti-scabies, anti-inflammatory, and wound-healing agent.
We examined the antioxidant activity of the methanolic extract of I. viscosa. We isolated and identified several polyphenolic antioxidants from I. viscosa leaves and focused on 1,3-dicaffeoylquinic acid (1,3-diCQA). Antioxidant activity was measured using ABTS and DPPH assays, which measure antioxidant activity. The concentrations of 1,3-diCQA required for the inhibition of oxidation were lower than those required by other Emricasan supplier known antioxidants. 1,3-diCQA inhibited oxidative damage caused by various factors, including FeSO(4) and AAPH (2,2′-azobis(2-amidinopropane) dehydrochloride). Antioxidant activity can also be detected by the ability of a compound to scavenge reactive oxygen species (ROS). 1,3-diCQA was found to scavenge hydroxyl radical and superoxide radicals, as measured by electron spin resonance (ESR). These data demonstrate that 1,3-diCQA exhibits antioxidant properties, probably through the involvement of a direct scavenging effect on several free radicals. (C) 2009 Elsevier Ltd. All rights reserved.”
“The effects of molecular weight on electroluminescent
properties of the light emitting polymeric nanocomposite, poly(9,9-dioctylfluorene-alt-thiophene) with chemically bonded gold nanoparticles (PDOFT-Au), have ALK inhibitor clinical trial been studied under a condition of constant polymer-to-gold weight ratio. The polymer, PDOFT, was first synthesized via the Suzuki cross-coupling reaction and then bonded to in situ-formed gold nanoparticles (AuNPs) via terminal thiol functional groups which had been generated during the quenching of polymerization. A series of PDOFT-Au’s of various molecular weights have thus been synthesized. At a constant polymer-to-gold weight ratio, the average size of gold nanoparticles (AuNPs) increased with an increase in the molecular weight of PDOFT.