Abstract
목적: 하이드로겔 콘택트렌즈에 HA(hyaluronic acid)를 IPN(interpenetrating polymer network)방법과 화학적 공유결합 방법(CCB; Chemical covalent bonding)으로 첨가하였을 때 광투과율과 함수율의 물리적 특성과 lysozyme 흡착량을 비교하여 하이드로겔 콘택트렌즈의 기능성 부여를 위한 효과적인 HA의 첨가방법을 살펴보고자 한다. 방법: 실험실에서 제조한 하이드로겔 콘택트렌즈에 IPN과 CCB의 두 가지 방법으로 HA를 첨가하였다. 광투과율은 300~800 nm 범위에서 측정하였으며, 함수율은 0.9% NaCl 생리 식염수를 사용하여 중량측정법으로 측정하였다. Lysozyme 흡착량은 lysozyme이 포함된 인공눈물을 제조하여 12시간동안 흡착시킨 후 HPLC로 정량하였다. 결과: HA가 첨가된 하이드로겔 콘택트렌즈의 함수율은 HA가 첨가되지 않은 렌즈에 비해 증가하였으며, CCB 방법에 비해 IPN 결합에서 함수율이 더 높게 나타났다. 광투과율은 HA 첨가 전과 후 모두 90% 이상으로 나타났다. Lysozyme 흡착 감소율은 IPN 방법으로 제조한 콘택트렌즈는 60.0%이며, CCB 방법으로 제조한 콘택트렌즈에서는 40.4%로 나타났다. 결론: CCB 방법은 기능성 물질을 렌즈 내부와 표면 전체에 화학적으로 균일하게 분포시키기에 적절한 방법이며, IPN 방법은 상분리 없이 렌즈 표면에 기능성을 부여하기에 적절한 방법으로 여겨진다. Purpose: The hydrogel lenses have been functionalized with HA(Hyaluronic Acid) using two different methods: construction of an IPN(Interpenetrating Polymer Networks) and formation of CCB(Chemical Covalent Bonding). The lysozyme adsorption and physical properties such as optical transmittance and water content of the hydrogel lenses have been investigated in order to determine whether method is suitable for the application potentials in contact lens industry. Methods: HA have been added to the hydrogel lenses prepared in the Lab using the two different method, e.g. IPN and CCB. The optical transmittance was measured in the wavelength range of 300~800 nm. The water content was measured by the gravimetric method using 0.9% NaCl saline solution. The amounts of adsorbed lysozyme on the contact lenses was analyzed by HPLC after incubation for 12h in artificial tears. Results: The water content of the HA added hydrogel contact lenses was increased, and the lens made by IPN method showed higher water content than the lens made by CCB method. The optical transmittance was over 90% both before and after addition of HA. Comparing the lysozyme adsorption reduction ratio, contact lens manufactured by IPN method was 60.0%, and the lens made by CCB method was 40.4%. Conclusions: CCB method is appropriate to distribute the functional material evenly throughout the lens, whereas IPN method is effective for the case of giving the functionality on the lens surface without phase separation.
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