Adsorption is an enzyme immobilization technique in which interactions such as hydrophobic forces and salt bridges are used to attach enzymes onto the surface of a solid support material. 

Advantages of Adsorption:

• Reagents are not required
• Minimum activation requirements
• No pore diffusion limitation
• Minimal drop in enzyme activity
• Minimum effect on an enzyme
• High enzyme loading efficiency
• The adsorbed enzyme can be regenerated, recycled, and reused
• Straightforward and cost-effective technique