title: A novel microgel and associated post-fabrication encapsulation technique of proteins.
abstract: A novel negatively thermo-sensitive and biodegradable microgel was prepared by combination of macromer synthesis and inverse suspension polymerization. A new post-fabrication encapsulation technique based upon this kind of intelligent microgel was developed. Model proteins (hemoglobin, bovine serum albumin and insulin) were encapsulated into the microgels at 4 degrees C and released in vitro at 37 degrees C. Relatively high loading levels and sustained release profiles demonstrate the feasibility of the encapsulation strategy. Since the encapsulation of proteins was performed at low temperature and after the preparation of microgels, organic solvent and high temperature were completely avoided in drug encapsulation. FTIR, Raman and circular dichroism measurements confirmed that the ordered structure of proteins was not destroyed during encapsulation and after release. Thus, the post-fabrication encapsulation technique in this paper is much unique and beneficial for controlled release of biomacromolecular drugs.
authors.affiliation: Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wen
authors.initials: W
authors.lastname: Zhu
authors.forename: Biaobing
authors.initials: B
authors.lastname: Wang
authors.forename: Jiandong
authors.initials: J
authors.lastname: Ding
mesh_terms: D002942:Circular Dichroism; D004337:Drug Carriers; D004339:Drug Compounding / Q000379:methods*; D006358:Hot Temperature; D020100:Hydrogels / Q000138:chemical synthesis / Q000737:chemistry*; D007328:Insulin / Q000008:administration & dosage; D010316:Particle Size; D011091:Polyesters; D011092:Polyethylene Glycols / Q000737:chemistry; D011506:Proteins / Q000008:administration & dosage* / Q000737:chemistry; D011994:Recombinant Proteins / Q000008:administration & dosage; D012710:Serum Albumin, Bovine / Q000008:administration & dosage; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D004337:Drug Carriers; D020100:Hydrogels; D007328:Insulin; D011091:Polyesters; D011506:Proteins; D011994:Recombinant Proteins; D012710:Serum Albumin, Bovine; D011092:Polyethylene Glycols; C033616:poly(lactide)