What are the methods for enzyme immobilization and their advantages?

Enzyme immobilization attaches enzymes to solid supports for industrial applications. Methods include: physical adsorption (weak binding to support, simple but may leach), covalent binding (chemical attachment to activated support, stable but may affect activity), entrapment (enclosure in polymer matrix or microcapsules, gentle but diffusion limitations), cross-linking (using bifunctional agents like glutaraldehyde, creates enzyme aggregates). Advantages of immobilization: enzyme reusability reducing costs, easier product separation, improved stability (against temperature, pH, organic solvents), continuous process operation, and better process control. Selection considers enzyme properties, substrate/product characteristics, and process requirements.