food tests

Question 1

what solution do you use to test presence of sugars

Answer 1

Benedict solution

Question 2

what solution do you use to test presence of starch

Answer 2

iodine solution

Question 3

what solution do you use to test presence of proteins

Answer 3

buiret solution

Question 4

what method is used to test for the presence of sugars

Answer 4

get 5cm3 of the food sample and place in test tube.
prepare a water bath at 75degrees.
add 10 drops of benedict solution using pippette to the test tube.
place the test tube in water bath and leave for 5 mins.
if the food sample contains a reduciing sugar the solution will change colour to green, yellow or red.

Question 5

what method is used to test for the presence of starch

Answer 5

get 5cm3 of the food sample and olace in test tube.
add a few drops of iodine solution to test tube and gently swirl it around.
if it contains startch then the colour will change from brown to black or blue.

Question 6

what method is used to test for the presence of proteins

Answer 6

get 2cm3 of the food sample and place in a test tube.
add 2cm3 of the biuret solution to testtube and shake.
if protein is present the colour will chnage from blue to pink or purple.