food tests

Question 1

what is the first part of the food test

Answer 1

1)get a piece of food and break it up using a pestle and mortar

2) transfer the ground food into the beaker and distilled water

3) mix with a glass rod to dissolve the food and filter using a funnel

Question 2

how do you test for sugars

Answer 2

1) prepare the food sample and transfer 5cm3 into a test tube

2) prepare a water bath and set to 75 degrees celsius

3) add 10 drops of benedict’s solution

4) leave for 5 mins

5) if it turns blue, yellow, red or green it has sugar

Question 3

how do you test for protiens

Answer 3

1) prepare food sample and transfer 2 cm3 into a test tube

2) add 2cm3 of biuret solution

3) if it turns blue or purple the there are protiens

Question 4

how do you test for lipids

Answer 4

1) prepare food sample and transfer 5 cm3 into a test tube

2) add 3 drops of Sudan III stain solution and gently shake

3) if the top layer turns bright red the there are lipids