REQUIRED PRACTICAL - FOOD TESTS Flashcards

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1
Q

What are the steps involved for testing for STARCH?

A
  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
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2
Q

What are the steps for testing for GLUCOSE?

A
  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
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3
Q

What are the steps for testing for PROTEIN?

A
  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
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4
Q

What are the steps for testing for OILS?

A
  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
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