Food tests:

• Food tests:

  1.Prepare food sample by grinding food up and mixing with water, filter out lumps
• Test for Starch:

  • Add iodine to test tube
  • Positive: Black/Blue
  • Negative: Orange
• Test for Proteins:

  • Add biuret to test tubes
  • Positive: purple
  • Negative: Blue
• Test for lipids:

  • Add ethanol to test tube and put a bong, then shake
  • Positive: Cloudy/white
  • Negative: Colourless
• Test for sugars:

  • Add benedict’s solution to test tube and heat in a water bath
  • Positive: Green(low amounts), Yellow(some sugar) and Brick red(high amount)
  • Negative: Blue