REQUIRED PRACTICAL - FOOD TESTS

Question 1

What are the steps involved for testing for STARCH?

Answer 1

1. Place a small amount of food onto a spotting tile
2. Add two drops of IODINE solution
3. If the food turns BLUE or BLACK, starch is PRESENT
   If it REMAINS BROWN starch is NOT PRESENT

Question 2

What are the steps for testing for GLUCOSE?

Answer 2

1. Place a small amount of food in a boiling tube
2. Add distilled water
3. Add ten drops of benedict’s solution
4. Heat in a water bath for 10 minutes
5. If it turns ORANGE or GREEN, GLUCOSE IS PRESENT
   If it REMAINS BLUE, no glucose is present

Question 3

What are the steps for testing for PROTEIN?

Answer 3

1. Place a small amount of food in a boiling tube
2. Add distilled water
3. Add 10 drops of biuret solution
4. If it turns LILAC, PROTEIN IS PRESENT
   If it REMAINS BLUE, protein IS NOT PRESENT

Question 4

What are the steps for testing for OILS?

Answer 4

1. Place a small amount of food in a boiling tube
2. Add 10cm of distilled water
3. Shake boiling tube
4. If OIL IS PRESENT, an EMULSION WILL FORM
   If not, the water will TURN CLOUDY