(i) Food preservatives: Chemical substance which are used to prevent food spoilage due to microbial growth are called preservative. For example, sodium benzoate, potassium sorbate, etc.
(ii) Enzymes: Enzymes are the essential biological catalysts which catalyse specific biological reactions at a very high rate under mild conditions of temperature and pH. For example, invertase, zymase etc.
(iii) Detergents: They are very similar to the salts of fatty acids found in soap but they are manufactured from materials other than animal fats. For example: Sodium alkylbenzene sulphonates are common ingredients of synthetic detergents.
