StyrosZyme® Pepsin, Immobilized Enzyme on Simulated-Monolith™ Polymeric Hard Gel: Full on line digestion of a of solution of 10 µl of 10 mg/ml protein. StyrosZyme® Pepsin, Immobilized Enzyme on Simulated-Monolith™ Polymeric Hard Gel: Full on line digestion of a of solution of 10 µl of 10 mg/ml protein.