Covalently immobilised penicillin G acylase is active in both apolar and wa
ter miscible solvents. Hydrated Celite R-640 added to water miscible solven
ts prevents the medium from stripping the water off the enzyme. The porous
siliceous matrix has been used also for the dehydration and storage of the
enzyme in apolar media. (C) 2001 Elsevier Science B.V. All rights reserved.