in the determination of unbound bilirubin by rate of oxidation with peroxidase , errors may be caused by ( 1 ) phenol , propylparaben , and phenothiazines ( free radical acceleration ) , ( 2 ) haemoglobin ( peroxidase effect ) , and ( 3 ) ascorbate ( inhibition ) .
C0030011
oxidation
C0027021
peroxidase