• Title/Summary/Keyword: polyrnethacrylic acid

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pH-Dependent Drug Release from Polymethacrylic Acid Hydrogel Matrix (Polymethacrylic Acid 하이드로겔 매트릭스로부터의 pH 의존성 약물 방출)

  • Kim, Kyung-Chung;Kim, Kil-Soo;Lee, Seung-Jin
    • Journal of Pharmaceutical Investigation
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    • v.19 no.4
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    • pp.179-183
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    • 1989
  • Drug release experiments were performed based on pH-sensitive swelling behaviors of polymethacrylic acid. 5-Fluorouracil as a nonionic model drug revealed release patterns depending solely on pH-dependent swelling kinetics of polymethacrylic acid. In contrast, release of propranolol hydrochloride as a cationic model drug was significantly affected by ionic drug-polymer interaction as well as the swelling kinetics. Accordingly, a zero-order release pattern was obtained at pH 7, which was distinguished from the general matrix type drug release pattern.

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