Comparison of electrochemical, electrophoretic and spectrophotometric methods for creatinine determination in biological fluids

被引:48
作者
Walsh, DA
Dempsey, E [1 ]
机构
[1] Inst Technol, Dept Appl Sci, Dublin 24, Ireland
[2] Dublin City Univ, Sch Chem Sci, Natl Ctr Sensor Res, Dublin 9, Ireland
关键词
creatinine; biosensor; flow cell; micellar electrokinetic chromatography; Jaffe reaction;
D O I
10.1016/S0003-2670(02)00110-1
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Quantitation of creatinine in biological fluids was achieved using both a biosensor based electrochemical flow cell and a micellar electrokinetic chromatography (MEKC) separation method. The results obtained from each method were compared with the widely recognised clinical method based on the Jaffe reaction. This is a standard spectrophotometric assay based on the Jaffe reaction of creatinine with alkaline picrate. The biosensor for creatinine was constructed by co-immobilising the enzymes creatininase, creatinase and sarcosine oxidase (SO) using a bovine serum albumin (BSA)-glutaraldehyde (GA) procedure at a platinum electrode. Detection of the hydrogen peroxide product of the third enzyme-catalysed reaction (SO) allowed the measurement of creatinine at +0.7 V versus Ag/AgCl. The biosensor was incorporated into a flow cell arrangement which allowed rapid determination of creatinine concentrations in urine samples with a limit of detection of 4.5 muM, a response time of 1 min, a linear range of 0-500 muM and a precision of 1.14% (n = 10). The results for five urine samples were compared with the Jaffe reaction method and based on this number of samples results from the spectrophotometric method were 36.7% higher than those determined using the flow cell method. A MEKC method for creatinine determination in serum samples was also developed and employed for serum analysis, with only a simple filtration step as sample preparation. The method showed a limit of detection of 11.5 muM, a linear range of 0-4.4 mM and a peak area precision of 2.7% (n = 10). The method was applied to creatinine determination in serum samples (n = 13) from patients undergoing renal dialysis and the results compared to the Jaffe reaction procedure. The Jaffe method generated values on average 26.7% greater than the corresponding MEKC results. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:187 / 198
页数:12
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