title: Formation of reversible shell cross-linked micelles from the biodegradable amphiphilic diblock copolymer poly(L-cysteine)-block-poly(L-lactide).
abstract: A novel biodegradable diblock copolymer, poly(L-cysteine)-b-poly(L-lactide) (PLC-b-PLLA), was synthesized by ring-opening polymerization (ROP) of N-carboxyanhydride of beta-benzyloxycarbonyl-L-cysteine (ZLC-NCA) with amino-terminated poly(L-lactide) (NH 2-PLLA) as a macroinitiator in a convenient way. The diblock copolymer and its precursor were characterized by (1)H NMR, Fourier transform infrared (FT-IR), gel permeation chromatography (GPC), and X-ray photoelectron spectroscopy (XPS) measurements. The length of each block polymer could be tailored by molecular design and the ratios of feeding monomers. The cell adhesion and cell spread on the PZLC-b-PLLA and PLC-b-PLLA films were enhanced compared to those on pure PLA film. PLC-b-PLLA can self-assemble to form micelles in aqueous media. A pyrene probe is used to demonstrate the micelle formation of PLC-b-PLLA in aqueous solution. Due to the ease of disulfide exchange with thiols, the obtained micelles are reversible shell cross-linked (SCL) micelles. The morphology and size of the micelles are studied by dynamic light scattering (DLS) and environmental scanning electron microscopy (ESEM).
authors.affiliation: Changchun Institute of Applied Chemistry, State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences, Changchun, P. R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Xuesi
authors.initials: X
authors.lastname: Chen
authors.forename: Tiancheng
authors.initials: T
authors.lastname: Lu
authors.forename: Shi
authors.initials: S
authors.lastname: Liu
authors.forename: Huayu
authors.initials: H
authors.lastname: Tian
authors.forename: Zhaopei
authors.initials: Z
authors.lastname: Guo
authors.forename: Xiabin
authors.initials: X
authors.lastname: Jing
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002448:Cell Adhesion; D018929:Cell Culture Techniques / Q000295:instrumentation; D045744:Cell Line, Tumor; D003545:Cysteine / Q000031:analogs & derivatives* / Q000737:chemistry; D006801:Humans; D019344:Lactic Acid / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008823:Micelles; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D008823:Micelles; D010455:Peptides; D011091:Polyesters; D011108:Polymers; D011721:Pyrenes; C532277:poly(L-cysteine)-block-poly(L-lactide); D019344:Lactic Acid; C033616:poly(lactide); C057713:polycysteine; D003545:Cysteine