Redox Reactions

Redox or reduction–oxidation is a type of chemical reaction in which the oxidation (loss of elections) states of a reactant change.�

- Donate an electron

- Receive an electron

Reducing Agent

Oxidizing Agent

🡪 Oxidized

🡪 Reduced

Benedict’s (solution) Test

1. Add 1 ml of food sample into a clean test tube.
2. Add 2 ml (10 drops) of Benedict’s reagent (CuSO4) in the food sample tube.
3. Heat the mixture in a boiling water bath for 3-5 minutes.
4. Observe the colour change in the solution of test tubes.

Iodine’s (solution) Test

1. Add 1 ml of food sample into a clean test tube.
2. Add few drops of Iodine solution using a dropper into the food sample tube.
3. Mix gently.
4. Observe the colour change in the solution of test tubes.

Biuret’s (solution) Test

1. Add 1 ml of food sample into a clean test tube.
2. Add few drops of Biuret’s solution using a dropper into the food sample tube.
3. Mix gently.
4. Observe the colour change in the solution of test tubes.

Ethanol (Emulsion) Test

1. Add food samples into 1 ml of ethanol into the clean test tube.
2. Shake the ethanol mixture until food is mixed thoroughly.
3. Add water into the food-ethanol mixture and mix gently.
4. Observe the colour change in the solution of test tubes.

H.W: Describe How to Test the Food for

Proteins, Carbohydrates & Fats?

Write a short note about each organic nutrient (Carbohydrates, proteins and Fats/lipids) and then describe the tests as second paragraph. At the end draw a table to compare the testing approach for each organic nutrient (Carbohydrates, proteins and Fats/lipids).