Temperature-sensitive hydrogels by graft polymerization of chitosan and N-isopropylacrylamide for drug release.
Summary of "Temperature-sensitive hydrogels by graft polymerization of chitosan and N-isopropylacrylamide for drug release."
Thermo-responsive polysaccharidic hydrogels were designed and synthesized by a free radical induced grafting procedure. Chitosan was chosen as biopolymer to impart biocompatibility and biodegradability to the macromolecular systems, while N-isopropylacrylamide (NIPAAm) was selected as co-monomer responsive for the thermo-sensitive properties. Ammonium persulfate was the initiator system and different polymeric networks have been synthesized by modulating the amount of NIPAAm in the polymerization feed. The resulting hydrogels were proposed as drug delivery devices and their performance was evaluated by using Diclofenac sodium salt as a model drug. Hydrogels were carefully characterized by FT-IR spectrophotometry, calorimetric analyses and swelling behavior in a temperature range of 15-45°C. Finally, to verify the suitability of these hydrogels as thermo-responsive devices, the drug release profiles were studied performing in vitro experiments around the swelling-shrinking transition temperatures of the macromolecular systems.
Department of Pharmaceutical Sciences, University of Calabria, Edificio Polifunzionale , Rende (CS) , Italy.
This article was published in the following journal.
Name: Pharmaceutical development and technology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22200242
- DOI: http://dx.doi.org/10.3109/10837450.2011.644298
Medical and Biotech [MESH] Definitions
Host Vs Graft Reaction
The immune responses of a host to a graft. A specific response is GRAFT REJECTION.
Graft Vs Host Reaction
An immunological attack mounted by a graft against the host because of tissue incompatibility when immunologically competent cells are transplanted to an immunologically incompetent host; the resulting clinical picture is that of GRAFT VS HOST DISEASE.
The survival of a graft in a host, the factors responsible for the survival and the changes occurring within the graft during growth in the host.
Graft Enhancement, Immunologic
The induction of prolonged survival and growth of allografts of either tumors or normal tissues which would ordinarily be rejected. It may be induced passively by introducing graft-specific antibodies from previously immunized donors, which bind to the graft's surface antigens, masking them from recognition by T-cells; or actively by prior immunization of the recipient with graft antigens which evoke specific antibodies and form antigen-antibody complexes which bind to the antigen receptor sites of the T-cells and block their cytotoxic activity.
Graft Vs Host Disease
The clinical entity characterized by anorexia, diarrhea, loss of hair, leukopenia, thrombocytopenia, growth retardation, and eventual death brought about by the GRAFT VS HOST REACTION.
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