19 : 1309-1313 , 1973 ) for plasma cholinesterase ( ec 3.1.1.7 ) gives a background absorbance of 1.4 a when extended to erythrocyte cholinesterase ( ec 3.1.1.8 ) measurement , because the peak absorbance of the reaction product , 5-thionitrobenzoate , coincides with the hemoglobin soret band at 410 nm .
C0008429
plasma
C0001044
erythrocyte cholinesterase