food tests

• What are the different food tests covered in the video?

  Benedict's, iodine, buret, and Sudan 3 tests
• What is the purpose of the Benedict's test?

  To test for reducing sugars
• What does the iodine test detect?

  It detects starch in food samples
• What does the buret test identify?

  It identifies proteins in food samples
• What is the purpose of the Sudan 3 test?

  To test for lipids in food samples
• What is the emulsion test used for?

  To test for lipids in food samples
• What is the general procedure to prepare a food sample for testing?

  • Break food using a mortar and pestle
  • Mix crushed food with distilled water
  • Stir until dissolved
  • Filter the solution to remove solids
• What is the first step in the Benedict's test?

  Prepare the food sample
• What temperature should the water bath be set to for the Benedict's test?

  75 degrees Celsius
• What color indicates the presence of reducing sugars in the Benedict's test?

  Green, yellow, or brick red
• What color does iodine turn when starch is present?

  Blue-black
• How much of the food sample is used in the buret test?

  2 centimeters cubed
• What color change indicates the presence of protein in the buret test?

  From blue to pink or purple
• What is added to the food sample in the Sudan 3 test?

  Three drops of Sudan 3 stain solution
• What indicates the presence of lipids in the Sudan 3 test?

  A bright red layer at the top
• What is the first step in the emulsion test for lipids?

  Add two centimeters cubed of ethanol
• What color change indicates lipids are present in the emulsion test?

  A cloudy white color
• What are the key differences between the Sudan 3 test and the emulsion test for lipids?

  • Sudan 3 test: uses Sudan 3 stain, shows red layer
  • Emulsion test: uses ethanol, shows cloudy white color
• What are the common steps in food tests preparation?

  1. Break food sample
  2. Mix with distilled water
  3. Stir and filter
  4. Use the solution for tests
• What are the main food tests and their targets?

  • Benedict's test: reducing sugars
  • Iodine test: starch
  • Buret test: proteins
  • Sudan 3 test: lipids
  • Emulsion test: lipids (Edexcel)