title: Synthesis and characterizations of amphiphilic poly(L-lactide)-grafted chondroitin sulfate copolymer and its application as drug carrier.
abstract: In this investigation, new biodegradable brush-like amphiphilic copolymers were synthesized by ring opening polymerization. Poly(L-lactide) (PLLA) was grafted onto chondroitin sulfate (CS), which is one of the physiologically significant specific glycosaminoglycans (GAGs), using a tin octanoate [Sn(Oct)2] catalyst in DMSO. The hydroxyl groups of the chondroitin sulfate were used as initiating groups. These functional groups enable specific mucoadhesion or receptor recognition. The degree of substitution (DS), the degree of polymerization (DP) and the chondroitin sulfate content (from 1.1 to 15.4%) were analyzed by 1H NMR. The characteristics of these grafted copolymers, including the structure, the thermal properties and biodegradability, etc., were examined with respect to CS content. Meanwhile, the amphiphilic core (PLLA)-corona (CS) nanoparticles, with size smaller than 200 nm, was examined by dynamic light scattering (DLS). Zeta potential analysis exhibited the value in the range -18.3 to -49.4 mV. The morphologies of the nanoparticles were observed by field-emission scanning electron microscopy (FE-SEM). The nanoparticles with lower cytotoxicity were examined by MTT assay. Furthermore, the in vitro BSA release kinetics of those CSn-PLLA nanoparticles was also determined in this study.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University 101, Section 2, Kuang Fu Road, Hsin Chu 300, Taiwan, ROC.
authors.forename: Chih-Ta
authors.initials: CT
authors.lastname: Lee
authors.forename: Ching-Ping
authors.initials: CP
authors.lastname: Huang
authors.forename: Yu-Der
authors.initials: YD
authors.lastname: Lee
mesh_terms: D002809:Chondroitin Sulfates / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004058:Diffusion; D004337:Drug Carriers / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011091:Polyesters / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000008:administration & dosage / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; D011091:Polyesters; D013501:Surface-Active Agents; D012710:Serum Albumin, Bovine; C033616:poly(lactide); D002809:Chondroitin Sulfates