Chemistry of foods

• Test for carbohydrates (starch)

  • Iodine Test (yellow-red)
  • Blue-Black if starch is present
• Test for protein

  • Biuret Test
  • Purple if protein is present
• Test for lipids

  • Ethanol Test
  • Cloudy layer if fat is present
  • (Ethanol is highly flammable)
• Test for sugar

  • Benedicts solution (blue)
  • Turns orange or (brick) red if present
• Complex carbohydrates, such as starch and cellulose, are made up of long chains of simple sugar units bonded together.
• Carbohydrates help to provide energy for the body.
• Proteins help with growth and repair.
• Lipids help insulate the body and provide energy for the body.
• Carbohydrates - Amylase - Simple sugars
• Protease - Proteins - Amino acids
• Lipase - Lipids - Fatty acids and Glycerol