Abstract:
:Thermosensitive macroporous scaffolds of poly(N-isopropylacrylamide) (polyNIPA) loaded with chitosan/bemiparin nanoparticles are prepared by the free radical polymerization in cryogenic conditions. Chitosan/bemiparin nanoparticles of 102 ± 6.5 nm diameter are prepared by complex coacervation and loaded into polyNIPA cryogels. SEM image reveal the highly porous structure of cryogels and the integration of nanoparticles into the macroporous system. Volume phase transition temperature (VPT) and total freezing water content of cryogels are established by differential scanning calorimetry, and their porosity is determined by image-NMR. Swelling of cryogels (above and below the VPT) is highly dependent on nanoparticles concentration. In vitro release profile of bemiparin from cryogel is highly modulated by the presence of chitosan. Bemiparin released from nanoparticles preserves its biological activity, as shown by the BaF32 cell proliferation assay. Cryogels are not cytotoxic for the human fibroblast cells and present excellent properties for application on tissue engineering and controlled release of heparin.
journal_name
Macromol Bioscijournal_title
Macromolecular bioscienceauthors
Peniche H,Reyes-Ortega F,Aguilar MR,Rodríguez G,Abradelo C,García-Fernández L,Peniche C,San Román Jdoi
10.1002/mabi.201300184subject
Has Abstractpub_date
2013-11-01 00:00:00pages
1556-67issue
11eissn
1616-5187issn
1616-5195journal_volume
13pub_type
杂志文章abstract::Injectable hydrogels are extensively used in drug delivery and tissue engineering to administer drugs, genes, growth factors and live cells. We report a method to produce tough, in-situ thermogelling, non-toxic, injectable hydrogels made of chitosan and hyaluronic acid co-crosslinked with β-glycerophophate and genipin...
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