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싱글 마이크로 니들 기반의 연속혈당센서 개발을 위한 효소고정기술 개발
김광복(K. B. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Blood glucose sensing is very important for diabetic management. It is shifting towards a continuous glucose monitoring because such a system can alleviate patient suffering and provide a large number of glucose measurements. Here, we proposed a novel approach for the development of durable and accurate enzymatic continuous glucose monitoring system (CGMS). For the long-term durable and selective immobilization of glucose oxidase on a single microneedle electrode, we introduced an innovative solution for enzyme immobilization on the surface of a microneedle electrode that uses bioengineered mussel adhesive protein (MAP). MAPs are known as potential biomedical and environmentally friendly underwater bioadhesives due to their strong and flexible adhesion with substrate-independent manner. Most importantly, their adhesion is maintained even in wet environments, e.g., in vivo, while chemical adhesives are easily weakened or broken by water. MAPs have a higher proportion of 3, 4-dihydroxyphenylalanine (Dopa) residue, which is catecholic amino acid produced by the post-translational hydroxylation of tyrosine 3, 4-Dihydroxyphenyl (Catechol), a side chain of the dopa residues, plays a key role in forming strong hydrogen bonds with the electrode surfaces. From this research, we confirmed that our proposed CGMS with a MAP-employing enzymatic glucose sensor has an outstanding performance compared with commercially available CGMS.
Preparation of the mixed oxide photocatalyst and its quantum yield
김동형(Dong H. Kim),이태규(Tai K. Lee),김경남(Kyung N. Kim),오정무(P. Chungmoo Auh),김광복(Kwang B. Kim),이승원(Seung W. Lee) 한국태양에너지학회 1995 한국태양에너지학회 학술대회논문집 Vol.- No.-
광촉매로 널리 알려진 TiO₂의 광분해 거동의 변화를 관찰하기 위하여 Nb₂O_5를 첨가하여 sol-gel 용법으로 제조한 후 DCA(dichloroacetic acid)의 광분해 효율을 측정하였다. Sol-gel process 과정에서 첨가된 Nb₂O_5의 농도 및 열처리 온도변화에 따른 광분해 효율을 관찰한 결과, Nb₂O_5를 첨가한 후 400℃에서 한 시간 동안 열처리 한 광촉매의 광분해 효율이 가장 높게 나타났다. 또한 열처리 온도와 무관하게 Nb₂O_5의 양이 증가할수록 광분해 효율은 감소하는 것으로 관찰되었다. 이는 excess electron 의 증가로 환원 반응 혹은 recombination rate가 증가하기 때문이라고 사료된다. 분해대상 물질의 pH가 낮을수록 광분해 효율이 증가하는 것을 알 수 있었다. The photocatalytic activity of TiO₂ was investigated as a function of added amount of Nb₂O_5, heat treatment temperature and the decomposition rate of 1 M dichloroacetic acid(DCA). Mixed oxides of TiO₂ and Nb₂O_5 was prepared by the sol-gel process. The addition of Nb₂O_5 into TiO₂ has deleterious effect on the decomposition rate of DCA, which was decreased as the amount of Nb₂O_5 was increased. The excess electrons due to the doping of Nb₂O_5 into TiO₂ can promote the reduction process instead of oxidation or recombination rate with electron holes. The most efficient photocatalyst was the one heat treated at 400℃ for an hour as far as the heat treatment temperature is concerned. The lower the pH of the solution, the higher the quantum yield.