Which component is necessary for pancreatic lipase to work in this experiment?

• A. Bile salts
• B. Glucose
• C. Water
• D. pH 7 buffer

Answer: (A)

Pancreatic lipase needs a large surface area of fat droplets to access and hydrolyze triglycerides. In the small intestine, bile salts act as detergents that emulsify fats, breaking them into tiny droplets and forming a interface where the lipase can act. This emulsification dramatically increases the substrate surface area, allowing the enzyme to efficiently hydrolyze triglycerides into fatty acids and monoglycerides. Without bile salts, fats remain in large droplets and lipase has little access to them, so the reaction doesn’t proceed well regardless of buffer pH or water presence. Glucose isn’t involved in lipid digestion, water is already present but doesn’t create the needed emulsified surface, and while maintaining pH is important, it’s the bile salts that enable the lipase to work in this fat-digesting context.