Nutrition and Food Tests

• Reagent in test for glucose


  Benedicts
• Reagent in test for starch


  Iodine
• Reagent in test for Fats


  Ethanol
• Reagent in test for protien


  Biuret
• Glucose colour change

  Blue to brick red precipiate
• Colour change for starch

  yellow/brown to blue/black
• colour change for fat

  colourless to white emulsion
• colour change for protien

  blue to lilac/purple
• In test for glucose heat tube in a water bath
• in the fat test shake vigourlessly
• simple carbohydrates are glucose, sucrose and lacotose
• Simple carbohydrates are used as fuel in cells to carry out aerobic respiration
• Complex carbohydrates release energy slowly
• cellulose can not be digested by the body and passes through our system as fibre
• Fats

  1. High energy content
  2. Buoyancy
  3. Insulation
  4. Protect organs
• Protein builds and repairs tissues
• Proteins are digested into amino acids by protease enzymes in the stomach