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Determination of Urea in Serum Based on the Combination of an Enzymatic Reaction with Immobilized Urease and Ion Chromatographic Analysis

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Abstract

A quantitative method for the determination of urea in serum was studied. An ion chromatograph (IC) with a conductivity detector was used in this method, where the chromatograph was modified by placing an immobilized urease column between the injection loop and a guard column of the cation analysis column. Immobilized urease was prepared by the adsorption of urease on cedar sawdust with triethylenetetramine. The adsorption capacity of urease was 190 mg g−1, and its activity was 3500 U g−1. The conversion efficiency of urea to ammonium ion was 100%, and the half life of immobilized urease was 60 days. It was possible to use the immobilized urease in a pH range of 3.0 to 9.0, and at temperatures up to 60°C. The determination of urea was attempted by IC attaching an immobilized urease column. The limit of detection of urea was 0.2 mg L−1, and the calibration curves of urea were very linear over 0.8 - 25 mg L−1. The urea concentration in the human serum could be determined with a standard deviation of 0.06 - 0.13 within 5 min after injecting the serum sample.

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Authors and Affiliations

  1. Department of Applied Chemistry, College of Engineering, Chubu University, 1200 Matsumoto, 487-8501, Aichi, Kasugai, Japan

    Toshiyuki Miyauchi, Yasutaka Miyachi, Makoto Takahashi, Norihisa Ishikawa & Hidehiko Mori

Authors
  1. Toshiyuki Miyauchi
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  2. Yasutaka Miyachi
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  3. Makoto Takahashi
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  4. Norihisa Ishikawa
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  5. Hidehiko Mori
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Correspondence to Toshiyuki Miyauchi.

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Miyauchi, T., Miyachi, Y., Takahashi, M. et al. Determination of Urea in Serum Based on the Combination of an Enzymatic Reaction with Immobilized Urease and Ion Chromatographic Analysis. ANAL. SCI. 26, 847–851 (2010). https://doi.org/10.2116/analsci.26.847

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  • DOI: https://doi.org/10.2116/analsci.26.847

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