Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Determination of Urea in Serum Based on the Combination of an Enzymatic Reaction with Immobilized Urease and Ion Chromatographic Analysis
Toshiyuki MIYAUCHIYasutaka MIYACHIMakoto TAKAHASHINorihisa ISHIKAWAHidehiko MORI
Author information
JOURNALS FREE ACCESS

2010 Volume 26 Issue 8 Pages 847-851

Details
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.

Information related to the author
© 2010 by The Japan Society for Analytical Chemistry
Previous article Next article
feedback
Top