title: Spectrophotometric determination of leukocytes in blood.
abstract: The determination of leukocyte concentration in human blood depending on the detection of oxidized o-dianisidine in acidic solution is studied. The oxidation of o-dianisidine was carried out by peroxidase enzymes found in leukocytes. The reaction was stopped by the addition of 4N H(2)SO(4) to the solution, and a very stable, colored o-dianisidine derivative was obtained. The calibration graph was plotted with the recorded absorbance values at 400 nm assigned to the y-axis, and leukocyte counts in 1-mL blood samples to the x-axis. The equation of the calibration graph was y=0.0025 x +0.0904, with a correlation coefficient of R=0.994. The coefficient of variation and P-value of the method were 4.00% and 0.05%, respectively.
mesh_terms: D003962:Dianisidine / Q000737:chemistry*; D006801:Humans; D007958:Leukocyte Count / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*
chemical_list: D003962:Dianisidine