N-Phthaloylchitosan-g-mPEG design for all-trans retinoic acid-loaded polymeric micelles

被引:40
作者
Opanasopit, Praneet
Ngawhirunpat, Tanasait [1 ]
Rojanarata, Theerasak
Choochottiros, Chantiga
Chirachanchai, Suwabun
机构
[1] Silpakorn Univ, Fac Pharm, Dept Pharmaceut Technol, Nanotechnol Drug Gene Delivery Syst Grp, Nakhon Pathom 730000, Thailand
[2] Chulalongkorn Univ, Petr & Petr Coll, Bangkok, Thailand
关键词
all-trans retinoic acid; controlled release; N-phthaloylchitosan; polymeric micelles;
D O I
10.1016/j.ejps.2007.01.002
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
The amphiphilic grafted copolymer N-phthaloylchitosan-grafted poly(ethylene glycol) methyl ether (PLC-g-mPEG) was synthesized using chitosan with four different degrees of deacetylations (DD) (80, 85, 90 and 95%). All-trans retinoic acid (ATRA) was incorporated into PLC-g-mPEG by dialysis method in an attempt to optimize carriers for ATRA delivery. Morphological investigation by transmission electron microscopy (TEM) showed that the particles had round and uniform shapes. The particle sizes of ATRA incorporated into micelles were about 80-160 nm depending on the initial drug-loaded and %DD of chitosan. Physicochemical properties of ATRA-loaded polymeric micelles were also investigated. It was found that %DD of chitosan, which corresponded to the N-phthaloyl groups in the inner core of the micelles, was a key factor in controlling the incorporation efficiency, stability of the drug-loaded micelles and drug release behavior. As the %DD increased, the incorporation efficiency and ATRA-loaded micelles stability increased. The sustained release profiles were also obtained at high %DD (90 and 95%). When compared to the unprotected ATRA, ATRA loaded in PLC-g-mPEG micelles was efficiently protected from photodegradation. This result suggested that loading of ATRA in micelles improved the chemical stability of ATRA. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:424 / 431
页数:8
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