food tests

• what is the method?

  1. crush the food and add distilled water
  2. to test for starch: iodine turns from orange -> black
  3. to test for sugars: Benedict solution turns from blue -> green -> yellow -> red when heated in a water bath
  4. to test for protein: biurets reagent turns from blue -> purple
  5. to test for lipids(fats): use cold ethanol then mix with water and will turn cloudy