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http://dx.doi.org/10.5806/AST.2007.20.5.393

Development of electrochemical biosensor for determination of galactose  

Park, Kap Soo (Department of Chemistry, Kwangwoon University)
Cho, Soon Sam (Department of Chemistry, Kwangwoon University)
Quan, De (Department of Chemistry, Kwangwoon University)
Lee, Jae Seon (Department of Chemistry, Kwangwoon University)
Cha, Geun Sig (Department of Chemistry, Kwangwoon University)
Nam, Hakhyun (Department of Chemistry, Kwangwoon University)
Publication Information
Analytical Science and Technology / v.20, no.5, 2007 , pp. 393-399 More about this Journal
Abstract
In principle, the blood galactose level may be determined conveniently with a strip-type biosensor similar to that for glucose. In this study, we describe the development of a disposable galactose biosensor strip for point-of-care testing. The sensor strip is constructed with screen-printed carbon paste electrode (SPCE) and sample amount (< $100{\mu}L$). The developed strip the galactose level in less than 90 s using bienzymatic system of galactose oxidase (GAO) and horseradish peroxidase (HRP). The effects of pH, mediator (1,1-ferrocenedimethanol) concentration, ratio of enzymes, and applied potential were determined preliminarily with glassy carbon electrodes, and optimized further with the strip-type electrodes. The sensor exhibits linear response in the range of $0{\sim}400{\mu}M$ ($r^2$ = 0.997, S/N = 3). Since a low working potential, in principle, the fabricated disposable galactose biosensor has -100 mV (vs. Ag/AgCl), it is applied for the detection of galactose, interfering responses from common interferents such as ascorbic acid, uric acid and acetaminophen could be minimized. The sensor has been used to determine the total galactose level in standard samples with satisfactory reproducibility (CV = 5 %).
Keywords
galactose biosensor; galactosemia; screen-printed carbon paste electrodes; point-of-care testing; galactose oxidase; horseradish peroxidase;
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