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Q20(b):
Explain the following terms with one example each. (b) Rancidity

Solution :

1. Theoretical Definition of Rancidity

Rancidity is defined as the process of slow oxidation of oil and fat present in food materials, resulting in a change in smell and taste. This phenomenon occurs when food items containing fats and oils are exposed to air (oxygen) for prolonged periods [Per the principles of Chemical Oxidation].

2. The Chemical Mechanism

The reaction involves the atmospheric oxygen ($O_2$) attacking the unsaturated fatty acid chains within food. This leads to the formation of volatile aldehydes, ketones, and carboxylic acids, which are responsible for the foul odor and rancid taste.

3. Illustrative Representation of Oxidative Degradation

Fresh Fat/Oil + Oxygen ($O_2$) Rancid Food (Oxidation Process)

4. Practical Example: Potato Chips

A quintessential example of rancidity is observed in deep-fried snacks such as potato chips. If left exposed to the atmosphere, the lipids in the chips react with oxygen, making them unfit for consumption. To prevent this, manufacturers employ specific preservation techniques:

Prevention Strategy Scientific Justification
Nitrogen Flushing Replacing air with an inert gas like Nitrogen prevents oxidative contact.
Air-tight Containers Reduces the volume of available oxygen for the oxidation reaction.
Antioxidants Chemicals like BHA (Butylated Hydroxyanisole) are added to inhibit the oxidation process.
Refrigeration Low temperatures decrease the kinetic energy of reactant molecules, slowing the rate of reaction.

5. Analytical Conclusion

Rancidity is essentially a form of chemical spoilage. By understanding that it is an oxidation reaction, we can scientifically control it by limiting exposure to oxidizing agents, lowering ambient temperature, or utilizing inert atmospheres [Based on the Rate of Reaction kinetics].

Final Solution: Rancidity is the oxidation of fats and oils in food, leading to unpleasant odors and tastes. Example: Potato chips becoming stale and foul-smelling when exposed to atmospheric oxygen over time.


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