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SbstractOxaliplatin was inserted into polymeric matrices aiming to study the interaction of this drug with these polymers and its capability to diffuse to the environment. Tested polymers were: (1) polyethylene glycol (PEG), (2) poly(lactic-co-glycolic acid) (PLGA), and (3) a copolymer of them (PLGA-PEG). The latter two were synthesized by us using polycondensation in bulk. Oxaliplatin was included in the matrices by the melt mixing process followed by casting. Fourier tran sform infrared spectroscopy (FTIR), proton nuclear magnetic resonance ( 1 H-NMR) and X-ray diffraction (DRX) studies of the polymers were performed proving the obtaining of the desired materials. In addition, the interaction between drug and matrices and the release profile of the oxaliplatin from these matrices were analyzed. Among them, PEG did not control the oxaliplatin release. In turn, PLGA and PLGA-PEG present drug release profiles quite similar. Oxaliplatin was completely released from PLGA and PLGA-PEG in 5 hours, by a relaxation mechanism. There was no evidence of oxaliplatin interaction with the different polymers. In addition, as the PEG improves the biocompatibility and biomasking, obtained results prove the obtaining of a drug release system, which allowed the total use of the drug improving the cancer treatment and even the welfare of the patients.

pH‐sensitive microparticles formed by combination of a synthetic copolymer and sodium alginate in presence of calcium chloride were prepared in mild conditions for specific water‐soluble drug delivery. The copolymers of acryloxyethyl‐trimethylammonium chloride and N‐vinyl‐2‐pyrrolidone were synthesized by radical polymerization in aqueous solution at 60°C using sodium persulfate as initiator. Fourier transform infrared spectroscopic characterization confirmed the structure of the copolymers and their compositions were determined by potentiometric method. Scanning Electron Microscopy study revealed that microparticles have a rough morphology with size ranging from 450 to 800 µm as measured by optical microcopy. Cefotaxime as a model drug was encapsulated in the microparticles to evaluate the in vitro release behavior under different pH conditions. At physiological temperature, the amount of drug released increased with increasing pH. The amount of drug release from microparticles after 24 h (84%) was more extensive in simulated intestinal fluid when compared with acidic pH environment (20%). These preliminary results suggest that the new microparticles can be used as good candidate for oral drug controlled release in the treatment to colon diseases. POLYM. ENG. SCI., 55:981–987, 2015. © 2014 Society of Plastics Engineers

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