Characterizations and Release Behavior of Poly [(R)-3-hydroxy butyrate]-co-Methoxy Poly(ethylene glycol) with Various Block Ratios

Poly[(R)-3-hydroxy butyrate] (PHB) and methoxy poly(ethylene glycol) (mPEG) were conjugated by the transesterification reaction with tin(II)-ethylhexanoate (Sn(Oct)-II) as a catalyst. Hydrophobic PHB and hydrophilic mPEG formed an amphiphilic block copolymer which was formed with the self-assembled...

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Bibliographic Details
Published inMacromolecular research Vol. 16; no. 5; pp. 418 - 423
Main Authors Jeong, Kwan-Ho, Kwon, Seung-Ho, Kim, Young-Jin
Format Journal Article
LanguageKorean
Published 2008
Subjects
polymeric micelle
PHB
drug delivery
hydrophobic and hydrophilic block ratio
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Summary:Poly[(R)-3-hydroxy butyrate] (PHB) and methoxy poly(ethylene glycol) (mPEG) were conjugated by the transesterification reaction with tin(II)-ethylhexanoate (Sn(Oct)-II) as a catalyst. Hydrophobic PHB and hydrophilic mPEG formed an amphiphilic block copolymer which was formed with the self-assembled polymeric micelle in aqueous solution. In this study, we tried to determine the optimum ratio of hydrophobic/hydrophilic segments for controlled drug delivery. The particle size and shape of the polymeric micelle were measured by atomic force microscopy (AFM) and transmission electron microscopy (TEM). Their size were 61-102 nm with various block ratios. Griseofulvin was loaded in the polymeric micelle as a hydrophobic model drug. The loading efficiency and release profile were measured by high performance liquid chromatography (HPLC). The model drug in our system was constantly released for 48 h.
Bibliography:KISTI1.1003/JNL.JAKO200820258462701
ISSN:1598-5032
2092-7673