An integrated microfluidic system for the determination of microalbuminuria by measuring the albumin-to-creatinine ratio

Chun Che Lin, Jue Liang Hsu, Chin Chung Tseng, Gwo Bin Lee

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This study presents an integrated microfluidic system for the determination of microalbuminuria (MAU) through the measurements of the albumin-to-creatinine ratios in patients' urinary samples. Albumin concentrations are determined based on a non-immunological dye binding assay in which the dyes react specifically with albumin to undergo a strong fluorescence enhancement. Creatinine concentrations are determined based on the Jaffé reaction in which the reagents react specifically with creatinine to form orange-red colored complexes. Two calibration curves for determining the concentrations of urinary albumin and creatinine are constructed with assay ranges of 5-220 and 1-100 mg/l, respectively. Using this system to determine the ACRs of collected clinical urine samples, statistical tools including Bland-Altman bias plot and Passing-Bablok regression analysis show that the results obtained by the proposed microfluidic system are in good agreement with those obtained by conventional methods. This simple, automatic, inexpensive, and microchip-based platform demonstrates a promising alternative to the conventional assays for determining MAU and may be suited for clinical applications.

Original languageEnglish
Pages (from-to)1055-1067
Number of pages13
JournalMicrofluidics and Nanofluidics
Issue number5
Publication statusPublished - 2011 May 1


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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