food test

Question 1

how to test for sugars

Answer 1

benedict test

1) prepare a food sample and transfer 5 cm3 into a test tube
2) prepare water bath set to75*C
3) add about 10 drops of Benedict solution to the test tube using a pipette
4) put test tube into the water bath and leave for five minutes
5) if the food sample contains sugar=🔵—>🟢🟡brick red

Question 2

how to test for starch

Answer 2

iodine

1) make a food sample transfer 5 cm3 into a test tube
2) add a few drops of iodine and gently shake the tube to mix
-if the sample contains starch, the colour will go from 🟠—>⚫️🔵

Question 3

how to test for proteins

Answer 3

-biuret test

1) prepare a sample of your food and transferred 2 cm3 into a test tube
2) add 2 cm3 of biuret solution to sample and mix by gently shaking
3) if the food contains protein, the solution will go from🔵—>🟣

Question 4

how to test for lipids

Answer 4

-sudan III

1) prepare 5 cm of food into test tube
2) use a pet to add three drops of Sudan III stain solution and gently shake
3) Sudan stain solution stains the lipids
If it contains lipids, the mixture separate out into two

The top layer will be 🔴
if no lipids, no red layer