Enzymatic assay for conjugated bilirubin (Bc) in serum using bilirubin oxidase (BOD).

Abstract:

:We described an automated enzymatic assay for conjugated bilirubin (Bc) in serum using the Iatro D-Bil kit, with bilirubin oxidase (EC 1.3.3.5 BOD) from Myrothecium species. The specificity of the enzyme in the Iatro D-Bil kit was examined by analyzing unconjugated bilirubin (Bu), delta bilirubin (Bdelta), and Bc with high-performance liquid chromatography (HPLC), before and after the enzymatic reaction using BOD. The within-assay coefficients of variation (CV) of this method were 0.58 to 5.00% (n = 20) at 1.4 to 155.8 micromol/L. Day-to-day Cvs ranged from 1.61 to 7.14% at 1.2 to 182.1 micromol/L. The analytical recovery was 96 to 101%. The presence of ascorbic acid, reduced glutathione, L-cysteine, uric acid, urea, creatinine, glucose, lipemic material, anticoagulants, hemoglobin, or human serum albumin did not affect this assay system. The correlation coefficient between values obtained with the Iatro D-Bil kit (y) and HPLC method as reference for conjugated fractions (x) was; r = 0.983, y = 0.952x + 8.851 micromol/L, Sy/x = 11.97 (n = 56). We studied serum Bc levels, not including Bu and Bdelta, in patients with hepatic diseases or autoimmune hemolytic anemia. Levels of Bc obtained by the proposed method changed more rapidly than did those of direct bilirubin (D-Bil) obtained by diazo-dye method during the course of the diseases.

journal_name

J Clin Lab Anal

authors

Kimura S,Iyama S,Yamaguchi Y,Hayashi S,Yanagihara T

doi

10.1002/(sici)1098-2825(1999)13:5<219::aid-jcla5>3

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

219-23

issue

5

eissn

0887-8013

issn

1098-2825

pii

10.1002/(SICI)1098-2825(1999)13:5<219::AID-JCLA5>3

journal_volume

13

pub_type

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