Propionic acid (from the Greek words protos, meaning "first", and pion, meaning "fat"; also known as propanoic acid) is a naturally occurring carboxylic acid. It is a liquid with a pungent and unpleasant smell somewhat resembling body odor. The anionCH3CH2CO2− as well as the salts and esters of propionic acid are known as propionates (or propanoates).
1. Used as preservative for both animal feed and food for human consumption
2. It is major used as a preservative in baked goods
3. It is widely used as a intermediate in the production of other chemicals, especially polymers
4. Use to make pesticides and pharmaceuticals
5. Use as solvents or artificial flavorings
6. It is also used in anti-fungal foot powders & to modify synthetic cellulose fibers