biology

•  test for the presence of reducing sugars in a solution


  Benedict’s test
• benedict's test colors:

  blue - no sugar

  green or yellow - traces of reducing sugar

  orange -moderate amount of sugars

  red- large amounts of reducing sugars
•  test for the presence of starch

  iodine test
• iodine test colors

  dark blue - contains starch,

  a brown or orange-brown - no starch
•  test for the presence of fats or oils in a food


  Ethanol emulsion test
• test for the presence of protein 


  Biuret test
• Biuret test 


  result:

  protein-- purple

  no protein-- remains blue
• material needed for benedicts test

  Benedict’s solution
• materials needed for iodine test


  iodine solution
• materials needed for ethanol emulsion test

  ethanol
• materials needed for biuret test

  biuret reagent
• ethanol emulsion test

  reaction:

  if there is oil or fats -- cloudy with small bubbles.

  If there is not any oil or fats -- transparent