In today's lesson 7C used the enzyme amylase to digest starch solution
First the starch solution was measured into a boiling tube
then drops of iodine solution were pipetted into the wells on a spotting tile
The iodine turns from orange to black with starch
you need to have lots ready
the amylase needs measuring out too
then mix it together
and start the clock
Each group used a different amount of amylase solution
then tested the mixture every 30 seconds
by adding a drop to one of the wells
if it turns black there is still starch there
but if it stays orange then all the starch has been digested by the amylase
the class found out that the more amylase you have
the quicker the starch gets digested
20ml Starch with 12ml amylase - no black after one minute
20ml Starch with 3ml amylase - no black after 8 minutes
