37 °C

Prof. Wilson: Let’s find out based on your results. 

You: Oh yes… 37 °C shows the shortest time for the colour change of the solution to turn from dark blue to light-yellow. This denotes that starch is efficiently converted to maltose. There is actually no enzymatic activity at the other temperatures. 

James: That makes sense since this is around the temperature of the normal body. 100oC is a very high temperature and 22°C and 4°C are very low to be of physiological significance.

                               Results: Optimal temperature for amylase activity