AbstractAn α‐galactosidase which will hydrolyze the oligosaccharides melibiose, raffinose, and stachyose has been immobilized on nylon microfibrils suitable for use in large flow‐through reactors. This catalyst system is stable for many months, both under use and storage conditions. The immobilized enzyme behaves similarly to the enzyme in solution, characteristically exhibiting both product and substrate inhibition. The catalyst is preparedin situand a large, 8‐liter reactor has been made. The catalyst has been used to reduce the raffinose concentration in beet sugar mo