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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/28655

    標題: Preparation of a thermo- and pH-sensitive nanofibrous scaffold with embedded chitosan-based nanoparticles and its evaluation as a drug carrier
    作者: Huang, Chih-Hao
    Kuo, Ting-Yun
    Lee, Chia-Fen
    Chu, Chun-Hsun
    Hsieh, Hsyue-Jen
    Chiu, Wen-Yen
    貢獻者: 化粧品應用與管理系
    關鍵字: Chitosan
    N-isopropyl acrylamide
    Drug release
    NMA crosslinking
    日期: 2014-08
    上傳時間: 2015-05-06 21:24:03 (UTC+8)
    出版者: Springer
    摘要: Environmentally sensitive poly(N-isopropylacrylamide) (PNIPAAm) nanofibrous scaffolds loaded with a hydrophilic drug were fabricated via an electrospinning process. First, thermally crosslinkable poly(NIPAAm-co-N-ethylolacrylamide) (PNN) was synthesized by redox polymerization below the phase transition temperature of PNIPAAm. The phase transition temperature of the PNN copolymer could be altered from 34 to 40 degrees C by changing the ratio of N-methylolacrylamide (NMA) to NIPAAm. Subsequently, PNN/chitosan nanofibers were electrospun using ethanol/acetic acid/water as a cosolvent. The PNN/chitosan nanofibers were sensitive to both pH and temperature. The fibrous structure of the soaked PNN/chitosan nanofibers was successfully preserved by the crosslinking of NMA. Furthermore, the chitosan-based nanoparticles (NPs) were introduced into the PNN nanofibers (PNN/NPs) to achieve prolonged drug release. The nanoparticles were observed in the PNN nanofibers by transmission electron microscopy. All of the scaffolds examined had high tensile strengths (1.45 MPa or above) and exhibited no significant cytotoxicity toward human fetal skin fibroblasts. Finally, doxycycline hyclate was used as a model drug. The results illustrated that PNN/NPs nanofibrous scaffolds exhibited continuous drug release behavior for up to 1 week, depending on the pH and temperature.
    Appears in Collections:[化妝品應用與管理系(所)] 期刊論文

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