Citric acid is a weak organic acid, and is triprotic. It is a natural preservative and is also used to add an acidic, or sour, taste to foods and soft drinks. In biochemistry, it is important as an intermediate in the citric acid cycle and therefore occurs in the metabolism of almost all living things. It also serves as an environmentally benign cleaning agent and acts as an antioxidant.
Application:
Citric acid is mainly used as an acidulating, flavoring and preservative in foods and beverages. It is also used as an antioxidant, plasticizer and detergent builder.
Storage: Kept in a light-proof, well-closed, dry and cool place.