Podcast
Questions and Answers
In the Benedict's test, what does a green/yellow color indicate after heating the sample in a water bath?
In the Benedict's test, what does a green/yellow color indicate after heating the sample in a water bath?
- Medium concentration of glucose
- Absence of glucose
- Low concentration of glucose (correct)
- High concentration of glucose
If a food sample remains orange/brown after adding iodine solution, what can you conclude?
If a food sample remains orange/brown after adding iodine solution, what can you conclude?
- The sample contains a high concentration of starch.
- The sample contains a low concentration of starch.
- The sample contains a moderate amount of glucose.
- The sample does not contain starch. (correct)
What elements are present in both proteins and lipids?
What elements are present in both proteins and lipids?
- Carbon, Hydrogen, Oxygen (correct)
- Hydrogen, Oxygen, Sulphur
- Carbon, Hydrogen, Nitrogen
- Carbon, Oxygen, Nitrogen
Which of the following is the correct procedure for the emulsion test for lipids?
Which of the following is the correct procedure for the emulsion test for lipids?
What does a purple color indicate in the Biuret's test?
What does a purple color indicate in the Biuret's test?
What is the purpose of using ethanol in the emulsion test for lipids?
What is the purpose of using ethanol in the emulsion test for lipids?
A food sample is tested using Biuret's solution, and the solution remains blue. What conclusion can be drawn?
A food sample is tested using Biuret's solution, and the solution remains blue. What conclusion can be drawn?
Which of the following best describes the function of lipids in living organisms?
Which of the following best describes the function of lipids in living organisms?
Flashcards
Test for Starch
Test for Starch
Uses iodine solution; turns blue/black for starch.
Benedict’s Test
Benedict’s Test
Tests for glucose; colors range from blue to brick red.
Protein Structure
Protein Structure
Proteins are polymers made from amino acids.
Testing for Protein
Testing for Protein
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Lipid Structure
Lipid Structure
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Emulsion Test
Emulsion Test
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Glucose Concentration
Glucose Concentration
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Elements in Proteins
Elements in Proteins
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Study Notes
Food Testing - Starch and Glucose
-
Benedict's test detects simple sugars like glucose
- Prepare a food sample
- Add 5ml of food sample to a test tube
- Add 5ml of Benedict's solution using a syringe and mix
- Place the test tube in a water bath at 80°C for 10 minutes
- Record the colour change after 10 minutes
- Negative result (no glucose) - blue
- Low glucose concentration - green/yellow
- Medium glucose concentration - orange
- High glucose concentration - brick red
-
Iodine test detects starch
- Prepare the food sample
- Place a small sample on a spotting tile
- Add 2-3 drops of iodine solution to the sample
- Observe the colour change
- Negative result (no starch) - orange/brown
- Positive result - blue/black
Food Testing - Protein and Lipids
-
Biuret's test detects protein
- Prepare 5ml of food sample
- Add 5ml of Biuret's solution
- Mix
- Observe the colour change
- Negative result - solution remains blue
- Positive result - solution turns purple
-
Emulsion test detects lipids
- Place a small spatula of food sample in a test tube
- Add 5ml of ethanol and shake (dissolves sample)
- Add 5ml of water and mix
- Observe the result
- Positive result - solution turns cloudy white
- Negative result - solution remains clear
Food Testing - General
- Food preparation for testing:
- Prepare the food sample (e.g. bread)
- Place the sample into a mortar and add a small amount of water
- Grind the food using a pestle
- Add 5ml of water and mix
- Fold a filter paper and place it into a funnel
- Filter the food sample into a small beaker.
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