Appendix

Abstract

Like with chemical catalysts, a few guidelines should be observed with biocatalysts to preserve activity and to handle them safely. Depending on the formulation—liquid, lyophilized, spray-dried, immobilized—different rules apply. Enzymes are often perceived as unstable and delicate entities, however, when treated in the right way, they can be as sturdy as almost any chemical catalyst. For optimal stability, enzyme preparations are usually stored best in their original commercial form, either as lyophilizate, spray-dried powder or (stabilized) liquid formulation.