摘要 :
The physicochemical characteristics of monolayer formation of amphiphilic block copolymers of N-vinylpyrrolidone-block-2,2,3,3-tetrafluoropropylmethacrylate (PVP-block-PFMA) with different molecular weights (M (w)) at the water-ai...
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The physicochemical characteristics of monolayer formation of amphiphilic block copolymers of N-vinylpyrrolidone-block-2,2,3,3-tetrafluoropropylmethacrylate (PVP-block-PFMA) with different molecular weights (M (w)) at the water-air interface and on the solid support (quartz, silicon) were studied. It was shown by UV and IR spectroscopy, analysis of the theta-S compression isotherms, and imaging by atomic force microscopy (AFM) that the state of PVP-block-PFMA monolayers on the aqueous subphase and solid support is determined by the ratio of M (w) of comonomer blocks M (w)(PFMA)/M (w) (PVP), the aggregation of copolymers in solution and in the surface layer (surface micellation and phase isolation). Gibb's surface energy of the films calculated in the Wendt-Good-Kaelbly-Dan-Fowkes approximation increases up to 30-33 mJ m(-2) from 21 mJ m(-2) (PFMA). The values of adhesion work W (adh)(monolayer-water droplet-air) and W (adh)(monolayer-water in octanol) and AFM imaging characterize the lipophilicity and surface topology of the films as optimal for thromboresistant materials.
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摘要 :
IR, UV, H-1, and C-13 NMR spectroscopic studies and potentiometric titration showed that the interaction of myoinositol hexakisphosphate (InsP(6)H(12)) and 1-(b-hydroxyethyl)-4,6-dimethyl-1,2-dihydro-2-hydroxypyrimidine (xymedone)...
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IR, UV, H-1, and C-13 NMR spectroscopic studies and potentiometric titration showed that the interaction of myoinositol hexakisphosphate (InsP(6)H(12)) and 1-(b-hydroxyethyl)-4,6-dimethyl-1,2-dihydro-2-hydroxypyrimidine (xymedone) in aqueous solution occurs via a proton transfer stage to form ionic and H-bonded complexes. In vitro study results using human plasma demonstrated synergism in antioxidant effects and activation of superoxide dismutase by phytic acid and xymedone complexed to form xymedone phytate.
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摘要 :
<abstract_text><p>The reaction in aqueous medium of phytic acid (myo-inositol hexakisphosphate) and glucosamine hydrochloride (2-amino-2-deoxy-beta-D-glucopyranose hydrochloride) formed phytic acid-glucosamine complexes of formula...
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<abstract_text><p>The reaction in aqueous medium of phytic acid (myo-inositol hexakisphosphate) and glucosamine hydrochloride (2-amino-2-deoxy-beta-D-glucopyranose hydrochloride) formed phytic acid-glucosamine complexes of formula InsP(6) . 5GA. Their compositions were proved by elemental analysis for C, H, N, and P. IR, PMR, C-13 NMR, and P-31 NMR spectroscopy and potentiometric titration showed that the complexes of phytic acid and glucosamine were formed by H-bonds and electrostatic salt interactions. High antioxidant activity against lipid peroxidation and a positive effect on superoxide dismutase activity were found for complexes of InsP(6)H(12) and glucosamine in in vitro studies of human blood plasma under oxidative stress.</p></abstract_text>
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