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In this work, the specific activity of acid urease immobilised on Eupergit® C250L at different enzyme loadings YP/B in the range of 48-170.5 mg BSAE/g dry support (ds) was satisfactorily reconstructed by using the simultaneous film and intraparticle diffusion and Michaelis-Menten kinetic reaction model. By referring to the intrinsic kinetic parameters of free acid urease, the statistically significant change in the apparent affinity of immobilised enzyme for urea was attributed to diffusiondoi:10.3303/cet1332189 doaj:d33cdc323340466ab13d9968f8e3260d fatcat:orzzfno45bfrrbzvzglbruglsq