N. Masuoka et al., SPECTROPHOTOMETRIC DETERMINATION OF HYDROGEN-PEROXIDE - CATALASE ACTIVITY AND RATES OF HYDROGEN-PEROXIDE REMOVAL BY ERYTHROCYTES, Clinica chimica acta, 254(2), 1996, pp. 101-112
A new method of hydrogen peroxide determination for the measurement of
catalase activity and rates of hydrogen peroxide removal by erythrocy
tes was described. Hydrogen peroxide was determined by converting it t
o the indamine dye with a water-soluble ironporphyrin and measuring th
e absorbance at 590 nm. This method was applied to the assay of catala
se in hemolysates from human, rat and mouse blood. The activities obta
ined were in agreement with those obtained by other methods including
UV method. The present method was also applied to the determination of
rates of hydrogen peroxide removal by intact erythrocytes from human
subjects, rats and mice. Data suggested that normal erythrocytes have
substantial capacity to remove extracellular hydrogen peroxide. From t
he measurement of catalase activity in erythrocytes treated with 3-ami
no-1,2,4-triazole and rates of hydrogen peroxide removal by the erythr
ocytes, it is deduced that rate constants related to the hemoglobin co
ntent (k/g Hb) for hydrogen peroxide removal by catalase in normal and
acatalasemic erythrocytes are 42.0 +/- 6.0 and 8.0 +/- 3.0, respectiv
ely.