Treatment of polyacrylamide gel particles with amidase to reduce residual acrylamide content thereof

A method of producing substantially dry particulate polymer of acrylamide having reduced acrylamide monomer content and comprising mixing amidase with aqueous gel particles that contain 20 to 50% polyacrylamide or acrylamideethylenically unsaturated monomer copolymer and that have a dry size at least 50% by weight above 30 .mu.m, absorbing the amidase into the gel particles, maintaining the particles as aqueous gel for a sufficient period to allow reduction of the acrylamide monomer content, and drying the aqueous gel particles.