title: Centrifugal analyzer method for total bilirubin in serum by use of diazotized 2-chloroaniline-5-sulfonic acid.
abstract: We describe two centrifugal analyzer methods for measuring total bilirubin in serum. Diazotized 2-chloroaniline-5-sulfonic acid is used in both. In the first procedure, ethylene glycol and methanol are used as an accelerator solvent; results correlate well with those by a Jendrassik and Grof method adapted to the centrifugal analyzer, but there is considerable hemolysis interference. In the second method, dimethyl sulfoxide is used with the ethylene glycol/methanol solvent and almost all hemolysis interference is eliminated. For either method, a 15-microliter sample is required. In the second method, instrument response is linearly related to concentration to 250 mg/L and the within-run precision (CV) is about 1%.
mesh_terms: D001391:Azo Compounds; D001557:Benzenesulfonates / Q000031:analogs & derivatives; D001663:Bilirubin / Q000097:blood*; D002498:Centrifugation; D006454:Hemoglobins; D006461:Hemolysis; D006801:Humans; D007202:Indicators and Reagents; D008722:Methods; D013425:Sulfanilic Acids / Q000031:analogs & derivatives
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D006454:Hemoglobins; D007202:Indicators and Reagents; D013425:Sulfanilic Acids; D001663:Bilirubin