title: Polyelectrolyte nanoparticles based on water-soluble chitosan-poly(L-aspartic acid)-polyethylene glycol for controlled protein release.
abstract: Water-soluble chitosan (WSC)-poly(L-aspartic acid) (PASP)-polyethylene glycol (PEG) nanoparticles (CPP nanoparticles) were prepared spontaneously under quite mild conditions by polyelectrolyte complexation. These nanoparticles were well dispersed and stable in aqueous solution, and their physicochemical properties were characterized by turbidity, FTIR spectroscopy, dynamic light scattering (DLS), transmission electron microscope (TEM), and zeta potential. PEG was chosen to modify WSC-PASP nanoparticles to make a protein-protective agent. Investigation on the encapsulation efficiency and loading capacity of the bovine serum albumin (BSA)-loaded CPP nanoparticles was also conducted. Encapsulation efficiency was obviously decreased with the increase of initial BSA concentration. Furthermore, its in vitro release characteristics were evaluated at pH 1.2, 2.5, and 7.4. In vitro release showed that these nanoparticles provided an initial burst release, followed by a slowly sustained release for more than 24 h. The BSA released from CPP nanoparticles showed no significant conformational change compared with native BSA, which is superior to the BSA released from nanoparticles without PEG. A cell viability study suggested that the nanoparticles had good biocompatibility. This nanoparticle system was considered promising as an advanced drug delivery system for the peptide and protein drug delivery.
authors.affiliation: The Key laboratory of Functional Polymer Material of Ministry of Education, Institute of Polymer Chemistry, Nankai University, 94# Weijin Road, Tianjin 300071, PR China.
authors.forename: Shujun
authors.initials: S
authors.lastname: Shu
authors.forename: Xinge
authors.initials: X
authors.lastname: Zhang
authors.forename: Dayong
authors.initials: D
authors.lastname: Teng
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Chaoxing
authors.initials: C
authors.lastname: Li
mesh_terms: D000818:Animals; D002417:Cattle; D002470:Cell Survival / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry*; D002942:Circular Dichroism; D004337:Drug Carriers / Q000737:chemistry* / Q000633:toxicity; D004573:Electrolytes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D051379:Mice; D041681:NIH 3T3 Cells; D053758:Nanoparticles / Q000737:chemistry* / Q000633:toxicity; D009391:Nephelometry and Turbidimetry; D009994:Osmolar Concentration; D010455:Peptides / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011506:Proteins / Q000378:metabolism*; D012710:Serum Albumin, Bovine / Q000378:metabolism; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D017186:Titrimetry; D014867:Water / Q000737:chemistry*
chemical_list: D004337:Drug Carriers; D004573:Electrolytes; D010455:Peptides; D011506:Proteins; D014867:Water; C017645:polyaspartate; D012710:Serum Albumin, Bovine; D011092:Polyethylene Glycols; D048271:Chitosan