The acetyl group in glacial acetic acid is the basis of all life in biochemistry. When it is combined with coenzyme A, it becomes the center of carbohydrate and fat metabolism. However, the concentration of acetic acid in cells is strictly controlled within a very low range to avoid destructive changes in the pH of the cytoplasm. Unlike other long-chain carboxylic acids, acetic acid is not present in triglycerides. However, artificial triglycerides containing glacial acetic acid, also known as glycerol acetate (glycerol triacetate), is an important food additive and is also used to make cosmetics and topical drugs.
Acetic acid is produced or secreted by certain bacteria. It is worth noting that Clostridium acetobutylicum belongs to the genus Clostridium, which is widely present in food, water and soil all over the world. Acetic acid is also naturally produced when fruits or other foods are spoiled. Acetic acid is also a component of the vaginal lubricating fluid of all primates, including humans, and is used as a mild antibacterial agent.