Biochemical Tests

Question 1

What is the test for starch?

Answer 1

Add iodine then look to see if colour has changed from brown/ orange is blue/ black it means starch is present

Question 2

Benedict’s test for reducing sugars

Answer 2

Benedict’s regent is added (starts blue) then boil - if a reducing sugar is present it will turn red

Question 3

Benedict’s test for non reducing sugars

Answer 3

Boil sample of benedict's solution
Boil a fresh sample with dilute acid
Neutralise with alkalis 
Now redo the benedict's test 
If it turns red a non reducing sugar was present in the first step