Which of the following strategies are useful for preventing oxidation of food stuffs ?
(i) Addition of antioxidants
(ii) Keeping food in airtight container
(iii) Use of flush bags containing inert gases
(iv) Addition of buffer solutions

Question

Accepted Answer

Option 2, which includes strategies (i) Addition of antioxidants, (ii) Keeping food in airtight containers, and (iii) Use of flush bags containing inert gases, is the correct answer for preventing the oxidation of foodstuffs. Here's why each of these strategies is effective:

1. **Addition of antioxidants (i):** Antioxidants are substances that can prevent or slow damage to cells caused by free radicals, which are unstable molecules that the body produces as a reaction to environmental and other pressures. In the context of food preservation, antioxidants help to prevent the oxidation of food by neutralizing free radicals, thereby extending the shelf life of food products and maintaining their nutritional quality.

2. **Keeping food in airtight containers (ii):** Oxygen is a key factor in the oxidation process. By storing food in airtight containers, the exposure of food to oxygen is minimized, which helps in slowing down the oxidation process. This method is particularly effective for dry foods and snacks, as it also helps in maintaining their texture and flavor.

3. **Use of flush bags containing inert gases (iii):** Inert gases, such as nitrogen, are used to displace oxygen in packaging. This method is known as modified atmosphere packaging (MAP). By reducing the oxygen concentration around the food, the oxidation process is significantly slowed down, which helps in preserving the food's freshness and extending its shelf life.

Now, let's explain why the other options are incorrect:

- **Option 1 (i), (ii), and (iv):** While the addition of antioxidants and keeping food in airtight containers are effective strategies, the addition of buffer solutions (iv) is not typically used for preventing oxidation. Buffer solutions are used to maintain a stable pH level, which is not directly related to preventing oxidation in foodstuffs.

- **Option 3 (ii), (iii), and (iv):** Similar to Option 1, this option includes the addition of buffer solutions (iv), which is not relevant to preventing oxidation. Although keeping food in airtight containers and using flush bags with inert gases are effective, the inclusion of buffer solutions makes this option incorrect.

- **Option 4 (All the four above):** This option includes all four strategies, but as previously mentioned, the addition of buffer solutions (iv) is not a strategy used for preventing oxidation. Therefore, this option is incorrect.

In conclusion, Option 2 is the correct answer because it includes the most effective strategies for preventing the oxidation of foodstuffs: the addition of antioxidants, keeping food in airtight containers, and using flush bags containing inert gases.