Comparative study of two commercial enzymatic kits for determining oxalate concentrations in urine

✍ Scribed by Joaquin Ruiz Santamaria; Rafael Coll; Emilia Fuentespina

• Book ID: 103039899
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 374 KB
• Volume: 26
• Category: Article
• ISSN: 0009-9120
• DOI: 10.1016/0009-9120(93)90034-4

✦ Synopsis

We performed a comparative study of two commercial kits for determining oxalate in urine. These were: (a) an oxalate decarboxylase-based assay (Boehringer Mannheim); (b) an oxalate oxidase-based assay (Sigma). The within-run and between-run imprecision were found to be similar in both methods. The recovery was 94% with the oxalate decarboxylase method. The pH of the specimen had a major effect on the recovery obtained by the oxalate oxidase method (66-86% at pH = 2.5 and 37-68% at pH = 1.5). The decarboxylase method was linear up to at least 2224 p, mol/L and the oxidase method was linear up to at least 890 p.mol/L. We also studied the interference of ascorbic acid in both techniques and found a positive bias with the oxidase method and a negative bias using the decarboxylase method. The correlation coefficient was 0.592.