title: Surface modification of mitoxantrone-loaded PLGA nanospheres with chitosan.
abstract: The purpose of this research was to develop polylactic-co-glycolic acid (PLGA) nanospheres surface modified with chitosan (CS). Mitoxantrone- (MTO-) loaded PLGA nanospheres were prepared by a solvent evaporation technique. The PLGA nanospheres surface was modified with CS by two strategies (adsorption and covalent binding). PLGA nanospheres of 248.4+/-21.0 nm in diameter characterized by the laser light scattering technique, scanning electron microscopy (SEM) are spherical and its drug encapsulation efficiency is 84.1+/-3.4%. Zeta potential of unmodified nanospheres was measured to be negative -21.21+/-2.13 mV. The positive zeta potential of modified nanospheres reveals the presence of CS on the surface of the modified nanospheres. Modified nanospheres were characterized for surface chemistry by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR). FT-IR spectra exhibited peaks at 3420 cm(-1) and 1570 cm(-1), XPS spectra shows the N 1s (atomic orbital 1s of nitrogen) region of the surface of the nanospheres, corresponding to the primary amide of CS. In vitro drug release demonstrated that CS-modified nanospheres have many advantages such as prolonged drug release property and decreased the burst release over the unmodified nanospheres, and the modified nanospheres by covalent binding method could achieve the release kinetics of a relatively constant release. These data demonstrate high potential of CS-modified PLGA nanospheres for the anticancer drug carrier.
authors: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, The Key Laboratory of Biomedical Material of Tianjin, Tianjin 300192, PR China.
authors: Hongli
authors: H
authors: Chen
authors: Wenzhi
authors: W
authors: Yang
authors: Han
authors: H
authors: Chen
authors: Lingrong
authors: L
authors: Liu
authors: Fuping
authors: F
authors: Gao
authors: Xindu
authors: X
authors: Yang
authors: Qian
authors: Q
authors: Jiang
authors: Qiqing
authors: Q
authors: Zhang
authors: Yinsong
authors: Y
authors: Wang
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D016503:Drug Delivery Systems; D004602:Elements; D006016:Glycolates / Q000737:chemistry*; D019344:Lactic Acid; D008942:Mitoxantrone / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D004602:Elements; D006016:Glycolates; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D048271:Chitosan; D008942:Mitoxantrone