Tests

• Test for reducing sugars


  Add food sample to Benedict's reagent, heat, observe colour change
• Test for starch


  Add iodine solution, blue-black colour indicates presence of starch
• Test for lipids/fats


  1. Rub food on sugar paper, presence of lipid makes paper translucent

  2. Add food, water, and alcohol, white precipitate indicates presence of lipid
• Test for proteins


  Add biuret reagent, purple colour indicates presence of protein