Why was 37°C used for incubation in the salivary amylase activity assay?

• A. Denatures the enzyme
• B. Prevents bacterial growth
• C. Similar to body temperature
• D. Accelerates the reaction regardless of enzyme

Answer: (C)

Enzymes in humans are tuned to work best at body temperature, around 37°C. Using this temperature in the assay places the reaction in physiological conditions, so salivary amylase operates near its optimum and the measured activity reflects what would happen in the body. At this temperature the enzyme is active and stable enough to speed the reaction efficiently; going higher could start to denature the protein, while cooler temperatures slow the rate. So 37°C isn’t about forcing the reaction to go faster regardless of the enzyme—it’s about matching the enzyme’s preferred environment to accurately reflect its normal activity.