The surface functionalization of microfiltration membranes (MFM) with different pore sizes and morphologies with respect to enzyme immobilization was investigated. Polypropylene (PP) and poly(ethylene terephthalate) (PET) membranes were therefore grafted (photopolymn.) with acrylic acid (AA) and 2-aminoethyl methacrylate (AmEMA) and the membrane permeabilities of the resulting PP-g-PAA, PP-g-PAmEMA, PET-g-PAA, and PET-g-PAmEMA MFM were detd. Covalent enzyme immobilization was carried out using the following enzymes: amyloglucosidase (aspergillus niger), invertase (baker's yeast), and fructosyltransferase (FTF, only PET-g-PAmEMA MFM). Enzyme bonding capacities of the resulting porous enzyme membranes were detd. The enzyme membrane reactor (EMR) performance was also detd., no enzyme release was obsd. The synthesis of inulin using covalent immobilized inulin-sucrase and EMR technique (FTF-immobilized PET MFM) is described.