• Title/Summary/Keyword: polyoxalate

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Synthesis and Characterization of High Molecular Weight Biodegradable Polyoxalate (고분자량 생분해성 폴리옥살레이트의 합성과 특성분석)

  • Kim, Se-Ho;Yoo, Han-Na;Khang, Gil-Son;Lee, Dong-Won
    • Polymer(Korea)
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    • v.34 no.6
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    • pp.547-552
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    • 2010
  • Biodegradable polymers have gained enormous attentions in the pharmaceutical and biomedical applications, especially in drug delivery. In this work, we report the synthesis and characteristics of high molecular weight polyoxalate with ~75000 Da. Hydrolytic degradation kinetics and degradation products were characterized by nuclear magnetic resonance and gel permeation chromatography. Polyoxalate is a semicrystalline and thermally stable polymer with a glass transition temperature of ${\sim}35^{\circ}C$, which is suitable for drug delivery applications. The hydrophobic nature of polyoxalate allows it to be formulated into nanoparticles and encapsulate drugs using a conventional oil-in-water emulsion/solvent displacement method. Polyoxalate nanoparticles also exhibited excellent cytotoxicity profiles. It can be suggested that polyoxalate has great potential for numerous biomedical and pharmaceutical applications.

Effect of Ratio of Polyoxalate/PLGA Microspheres on the Release Behavior of Zaltoprofen (Polyoxalate 및 PLGA 미립구의 혼합 비율별에 따른 Zaltoprofen의 방출거동)

  • Lee, Jung Keun;Kim, Kyoung Hee;Kim, Young Lae;Park, Guk Bin;Kim, Min Jeong;Kang, Su Ji;Lee, Dongwon;Khang, Gilson
    • Polymer(Korea)
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    • v.37 no.1
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    • pp.28-33
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    • 2013
  • Zaltoprofen, a propionic acid derivative non-steroidal anti-inflammatory drug, was known to have powerful inhibitory effects on acute, subacute and chronic inflammation. For initial release and sustained release, the microspheres were prepared using an emulsion-solvent evaporation method like an O/W emulsion method with varying the ratio of zaltoprofen-loaded polyoxalate (POX)/PLGA micropheres. The morphology of the microspheres was confirmed by scanning electron microscopy. The crystallinity of microspheres was analyzed by X-ray diffraction and differential scanning calorimeter. Fourier transform infrared spectroscopy was used to analyze the chemical structure of microspheres. The increased ratio of POX microspheres affected the initial drug release, and the sustained release of drug was influenced by ratio of PLGA microspheres. In this study, the initial release behavior of zaltoprofen can be controlled by the ratio of POX/PLGA microspheres.

Preparation and Release Behavior of Atorvastatin Calcuim - Encapsulated Polyoxalate Microspheres (아토르바스타틴 칼슘을 함유한 폴리옥살레이트 미립구의 제조 및 방출거동)

  • Lee, Cheon Jung;Kim, Su Young;Lee, Hyun Gu;Yang, Jaewon;Park, Jin Young;Cha, Se Rom;Lim, Dong-Kwon;Lee, Dongwon;Khang, Gilson
    • Polymer(Korea)
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    • v.38 no.5
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    • pp.656-663
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    • 2014
  • Atorvastatin calcium-loaded polyoxalate (POX) microspheres were prepared by an emulsion solvent-evaporation/ extraction method of oil-in-oil-in-water ($O_1/O_2/W$) for sustained release. We investigated the release behavior according to initial drug ratio, molecular weight ($M_w$) and concentration of POX and concentration of emulsifier. The microsphere was characterized on the surface, the cross-section morphology and the behavior of atorvastatin calcium release for 10 days by scanning electron microscopy (SEM) and high performance liquid chromatography (HPLC). The analysis of crystallization was analyzed to use X-ray diffraction (XRD), differential scanning calorimeter (DSC) and Fourier transform infrared (FTIR). These results showed that the release behaviors can be controlled by preparation conditions.

Preparation and Characterization of Zaltoprofen-Loaded Polyoxalate Microspheres for Control Release (방출제어를 위한 잘토프로펜이 함유된 폴리옥살레이트 미립구의 제조와 특성)

  • Kim, Kyoung Hee;Lee, Cheon Jung;Jo, Sun A;Lee, Jung Hwan;Jang, Ji Eun;Lee, Dongwon;Kwon, Soon Yong;Chung, Jin Wha;Khang, Gilson
    • Polymer(Korea)
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    • v.37 no.6
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    • pp.702-710
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    • 2013
  • Zaltoprofen loaded polyoxalate (POX) microspheres were prepared by an emulsion solvent-evaporation/extraction method like oil-in-water (O/W) for sustained release of zaltoprofen. The influence of several preparation parameters such as fabrication temperature, stirring speed, intensity of the sonication, initial drug ratio, molecular weight ($M_w$) of POX, concentration of POX and concentration of emulsifier has been investigated on the zaltoprofen release profiles. Physicochemical properties and morphology of zaltoprofen loaded POX microspheres were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimeter (DSC) and Fourier transform infrared (FTIR). Through the analyzed results, it was demonstrated that the characteristics of the microspheres greatly affected by the prepared condition. The releases behavior of zaltoprofen was investigated for 10 days in vitro. It was confirmed that the release behavior of zaltoprofen can be controlled by the manufacturing factor of solvent-evaporation/extraction method.