food tests

• What does iodine solution test for?

  Starch
• How do you carry out the food test for starch?

  Add iodine solution to the substance to be tested and look for colour change
• What color change indicates the presence of starch in the Fool Testy?

  Turns blue-black
• What does Benedict's solution test for?

  Reducing sugar
• How do you carry out the Benedict's test?

  Add Benedict's solution and heat for 2 mins in a water bath at boiling point and then look for a colour change
• What color change indicates the presence of reducing sugar in the Benedict's test?

  Turns brick red
• What does a yellow/orange result in the Benedict's test indicate?

  Less sugar is present
• What does Biuret's solution test for?

  Protein
• How do you carry out the Biuret's test?

  Add Biuret's solution to the substance and look for a colour change
• What color change indicates the presence of protein in the Biuret's test?

  Turns purple
• What does the Ethanol test for?

  Lipids
• How do you carry out the Ethanol test?

  Add ethanol to the solution and shake thoroughly then add water and look for a colour change
• What color change indicates the presence of lipids in the Etharal test?

  Turns cloudy/milky