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• W2108066669 abstract "Water mobility plays a crucial role in determining transport properties of small molecules in polymer matrices. In particular, in drug delivery systems, water state affects the pharmacokinetics, especially drug absorption, diffusion and release. In the present study, the state of water in an antibiotic-loaded composite consisting of albumin nanoparticles (BSA(np)) dispersed into a carboxylated polyurethane (PEUA) has been investigated and compared with that of the single drug-loaded components. The antibiotic cefamandole nafate was used as a model drug. DSC analysis, used to evaluate the freezing and non-freezing water fractions in the hydrated samples, showed that in BSA(np) water can adsorb both in the inter-particles regions and inside the particles. With increasing of total adsorbed water amount, the contribution of the freezing water fraction was higher than the non-freezing one. As for PEUA, the majority of water molecules absorbed is in a mobile freezing state (about 60% of the W(tot)). As for the PEUA/BSA(np) composite, the higher polyurethane phase segregation induced by the nanoparticles as well as the higher non-freezing water fraction significantly enhanced drug uptake with respect to PEUA. Moreover, the greater non-freezing water fraction allowed the drug to penetrate within BSA nanoparticles and to give rise then to a controlled drug release. Indeed, the diffusion barrier exerted by nanoparticles and the matrix prolonged the antimicrobial activity from 4 to 9 days. Finally, the higher polyurethane phase segregation also improved composite mechanical properties, as evidenced in stress-strain experiments and dynamic mechanical analysis." @default.
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• W2108066669 date "2011-04-01" @default.
• W2108066669 modified "2023-10-03" @default.
• W2108066669 title "Water state effect on drug release from an antibiotic loaded polyurethane matrix containing albumin nanoparticles" @default.
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• W2108066669 doi "https://doi.org/10.1016/j.ijpharm.2011.01.029" @default.
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