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효소반응기를 이용한 D-Fructose의 전류법적 정량
추고연,이은숙,윤종훈,이흥락 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
The amperometric determination method of D-fructose using an enzyme reactor was developed. The enzyme reactor was fabricated by immobilizing enzyme on the glutaraldehyde-activated aminoalkyl silanized controlled-pore glass beads. The principle of measurement is based on the amperometric detection of ferrocyanide ion when D-fructose was oxidized specifically by the enzyme reactor in the presence of ferricyanide ion as an electron acceptor. The optimal experimental conditions were as follows : applied potential, 0.70 volts vs. Ag/AgCl (sat'd KCl) reference electrode; flow rate of carrier solution (3.0x10^(-2) M K_(3)Fe(CN)_(6) + 0.12% Triton X-100 + McIlvaine buffer of pH 5.00), 0.18 μl/min ; injection volume of sample solution, 20 μl, and temperature of enzyme reactor, 20 ℃.
새로운 효소반응기를 이용한 Sucrose의 전류법적 정량
이흥락,양윤형,추고연 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
The continuous amperometric determination method of sucrose using new enzyme reactors and the glassy carbon working electrode was developed. The principle of measurements was based on the amperometric detection of ferrocyanide ion formed when glucose to be inverted by invertase reactor was oxidized specifically by the GO_(x)/MUT enzyme reactor immobilized glucose oxidase and mutarotase, in the presence of ferricyanide ion as an electron acceptor. The optimal conditions were as follows: applied potential, 0.70 volt vs. silver/silver chloride reference electrode(sat'd KCl); flow rate of carrier solution(1.0 x 10^(-2) M K_(3)Fe(CN)_(6) + 0.80 M phosphate buffer of pH 7.3), 0.18 ml/min; injection volume of sample solution, 20 μl and temperature of enzyme reactors, 30 ℃.
김태환,성재석,최정식,추고연,유윤종 한국공업화학회 1999 응용화학 Vol.3 No.2
Mischmetal(Mm) is substituted for La of AB_5 type alloys because of the lower cost of Mm than La. But the equilibrium H₂ absorption pressure is more sensitive to Mm than La. As the volatility of Mm is higher than other metal component of the AB_5 alloy, it is significant to optimize the excess Mm quantity of MmNi_5 type alloys. In this work, series of excess Mm(1, 5, 10, 15%) of a stoichiometry were investigated with XRD and PCT measurements.