MCQ Detailed View

Potassium meta-bisulphite (K₂S₂O₅) is a chemical compound widely used as a food preservative because of its ability to inhibit microbial growth and prevent spoilage. It is particularly effective against yeasts, molds, and bacteria, making it an important additive in the food industry.

One of the most common applications of potassium meta-bisulphite is in fruit juices. It helps maintain the freshness, flavor, and color of juices by preventing fermentation and slowing down chemical reactions that cause spoilage. This preservative works by releasing sulfur dioxide (SO₂) when dissolved, which acts as an antimicrobial and antioxidant agent.

While potassium meta-bisulphite can also be found in some wines and squashes, its primary and most widely accepted use is in fruit juices, where maintaining stability and shelf life is crucial. It is less commonly used in tomato ketchup or pickles because other preservatives or processing techniques are typically employed in these products.

The compound is generally considered safe in regulated amounts, but excessive consumption can cause allergic reactions in sensitive individuals. Its effectiveness depends on the concentration, the pH of the food, and the storage conditions.

Understanding potassium meta-bisulphite is part of food chemistry, a branch of applied chemistry that studies additives, preservatives, and chemical reactions in foods. It highlights how chemical principles are applied to everyday life to improve safety, shelf life, and quality of common consumables like fruit juices.