title: [Preparation and release behavior of chitosan scaffolds encapsulating proteins loaded in PLGA microspheres].
abstract: OBJECTIVE
  To prepare cells scaffolds with the characteristics of sustained release of proteins.
  
  
  METHODS
  Chitosan scaffolds was prepared by freeze-drying. Porosity and water content of scaffolds were determined. Bovine serum album (BSA) was selected as a model protein. Poly (lactic-co-glycolic acid) (PLGA) microspheres were prepared by double emulsion solvent evaporation and encapsulated into chitosan scaffolds. The morphology of PLGA microspheres and various scaffolds were observed using scanning electron microscope. Release behavior of BSA from various chitosan scaffolds was investigated.
  
  
  RESULTS
  The chitosan scaffold represents porous. At the -70 degrees C of quenching temperature, the porosity and water content of chitosan scaffolds were 78.6% +/- 1.5% and 85.1% +/- 6.2%, respectively. PLGA microspheres can be uniformly encapsulated into scaffolds without any morphology change. Significant sustained release of BSA from PLGA microspheres encapsulated into scaffolds was obtained. The cumulative release at 168 h was only 33.5%, while that of BSA from chitosan scaffolds at 24 h was above 90%. The release behavior can be controlled by adjusting the amount of chitosan in scaffolds and the type of PLGA.
  
  
  CONCLUSIONS
  The novel chitosan scaffolds encapsulating PLGA microspheres proved to be a promising cells scaffolds with controlling the release of growth factors in tissue engineering.
authors.affiliation: Institute of Pharmaceutics, Zhejiang University, Hangzhou 310031, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Han
authors.forename: Hai-Liang
authors.initials: HL
authors.lastname: Chen
authors.forename: Xiao-Yi
authors.initials: XY
authors.lastname: Sun
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Gao
authors.forename: Wen-Quan
authors.initials: WQ
authors.lastname: Liang
mesh_terms: D048271:Chitosan / Q000008:administration & dosage* / Q000737:chemistry; D004337:Drug Carriers; D005612:Freeze Drying / Q000379:methods; D019344:Lactic Acid / Q000737:chemistry; D008863:Microspheres; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000378:metabolism*; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D004337:Drug Carriers; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D012710:Serum Albumin, Bovine; D019344:Lactic Acid; D048271:Chitosan