The residual acid phosphatase activities (APA) in ''Parizsi'' sausages
(pork meat) with different amounts of tetrasodium pyrophosphate, back
fat, protein additives (milk, soy, rind and blood protein) and lean po
rk were determined by the acid phosphatase assay developed in the Hung
arian Meat Research Institute. Tetrasodium pyrophosphate did not affec
t APA. Acid phosphatase heat resistance increased dramatically with ba
ckfat when the fat content was less than 30%. Soy protein decreased re
sidual APA while milk protein had a slightly positive effect. Rind pow
der, rind emulsion and blood emulsion increased the activities. The mo
st influential factor affecting residual APA was the lean pork content
. The relationship between the two factors was linear.