한국안광학회지 (Journal of Korean Ophthalmic Optics Society)

한국안광학회 (The Korean Ophthalmic Optics Society)
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Alginate가 포함된 하이드로겔의 물리적 특성

Physical Properties of the Hydrogel Using Alginate

  • 우철민 (대구가톨릭대학교 안경광학과, 시기능증진연구소) ;
  • 허성인 (대구가톨릭대학교 안경광학과, 시기능증진연구소) ;
  • 이현미 (대구가톨릭대학교 안경광학과, 시기능증진연구소)
  • Woo, Chul-min (Dept. of Optometry & Vision Science, Catholic University of Daegu, Institute for Eye-functional Promotion) ;
  • Heo, Seongin (Dept. of Optometry & Vision Science, Catholic University of Daegu, Institute for Eye-functional Promotion) ;
  • Lee, Hyun Mee (Dept. of Optometry & Vision Science, Catholic University of Daegu, Institute for Eye-functional Promotion)
  • 투고 : 2015.11.02
  • 심사 : 2015.12.22
  • 발행 : 2015.12.31
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초록

목적: 해조류에서 추출된 알지네이트(alginate)와 염화칼슘($CaCl_2$)이 포함된 하이드로겔을 제작하여 물리적 특성을 살펴보고 콘택트렌즈로의 활용성을 파악하고자 한다. 방법: 하이드로겔 콘택트렌즈의 재료인 2-hydroxyethylmethacrylate(HEMA)와 개시제인 azobisiobutyonitile(AIBN), 가교제인 ethylenglycoldimethacrylate(EGDMA)를 사용하여 본 실험에 사용 할 시료를 필름 형태로 제작하였다. Phosphate-buffered saline(PBS)용액에 24시간 수화시킨 후 1%, 2% 알지네이트와 1%, 3%, 5% 염화칼슘 용액에 각각 24시간씩 interpenetrating polymer network (IPN)을 실행하였으며, 물리적인 특성을 평가하기 위해 굴절률, 함수율, 접촉각 및 인장강도를 측정하였다. 결과: IPN후 필름의 물리적 특성을 측정한 결과 함수율은 30.89~36.89%, 굴절률은 1.434~1.441, 접촉각은 $62.98{\sim}80.45^{\circ}$, 인장강도는 2.378~4.215 ($gf/mm^2$)로 각각 나타났다. 또한 알지네이트의 함량이 증가함에 따라 물리적 특성 변화가 거의 없었으며, 염화칼슘의 함량이 증가함에 따라 함수율은 감소하는 경향을 나타냈다. IPN 결과, HEMA를 기본으로 하는 콘택트렌즈에 비해 함수율 및 접촉각은 감소하였으나 인장강도는 증가하는 것으로 나타났으며 1차 IPN보다는 2차 IPN에서 인장강도가 높은 것으로 나타났다. 염화칼슘을 포함하는 하이드로겔의 경우, 24시간 중합한 시료 및 2% 알지네이트와 2차 IPN한 시료에서는 염화칼슘의 함량이 증가하면 접촉각이 감소하는 것으로 나타났다. 결론: 염화칼슘의 농도 증가는 하이드로겔 필름의 인장강도를 증가시킨다. 알지네이트와 염화칼슘이 포함된 하이드로겔은 콘택트렌즈로서의 기본적인 물리적 특성을 가지고 있으며 앞으로 콘택트렌즈 소재로 활용할 가능성이 충분히 있음을 확인할 수 있었다.

Purpose: A hydrogel including alginate and $CaCl_2$ extracted from seaweed was manufactured, and their physical properties were investigated. Also, its applicability as contact lenses was examined. Methods: A film-type sample used in this experiment was manufactured using 2-hydroxyethyl methacrylate (HEMA), which is the raw material of hydrogel contact lenses; azobisiobutyonitile (AIBN), which is an initiator and ethylenglycoldimethacrylate (EGDMA), which is a cross-linking agent. It was hydrated in a PBS solution for 24 hours, and an interpenetrating polymer network (IPN) was formed in 1% and 2% alginate and 1%, 3%, and 5% $CaCl_2$ solutions for 24 hours, respectively. Results: The measurement of the physical properties of the film after the IPN showed that the moisture content was 30.89~36.89%, the refractive index was 1.431~1.441, the contact angle was $62.98{\sim}80.45^{\circ}$, and the tensile strength was 2.378~4.215 ($gf/mm^2$). Also, the physical properties hardly changed as the content of alginate increased, and the moisture content decreased as the content of $CaCl_2$ increased. As a result of the IPN, the moisture content and contact angle decreased compared to those of basic HEMA, but the tensile strength increased. The tensile strength of the second IPN was higher than that of the first IPN. In the case of $CaCl_2$, for the sample polymerized for 24 hours and the second IPN sample with 2% alginate, the contact angle decreased as the content of $CaCl_2$ increased. Conclusions: In this study, the tensile strength increased as the content of $CaCl_2$ increased, and the wettability increased as a result of IPN of alginate and $CaCl_2$. The hydrogel containing the alginate and $CaCl_2$ was confirmed possible utilization as contact lens material.

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참고문헌

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