Effect of Formalin Fixation on the Activity of Five Enzymes of Rat Liver

Abstract
The effect of formalin fixation on the enzymatic activity of five enzymes in rat liver was studied as a function of time and temperature, β-glucuronidase was found to be most resistant to the inactivating effects of formalin. At a time when fixation was satisfactory for preparing frozen sections (24 hours), considerable enzymatic activity was present in decreasing order; β-glucuronidase, sulfatase, acid phosphatase, esterase, and alkaline phosphatase.