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Key Characteristics and Functions of Propionic Acid
The core feature of propionic acid is its effective preservative and antimicrobial properties, making it indispensable in the food, feed, and agricultural sectors.
Preservative and Antimicrobial Properties
Propionic acid and its salts significantly inhibit the growth of molds, aerobic spore-forming bacteria, and Gram-negative bacteria. Its mechanism of action involves penetrating microbial cell membranes in its molecular form, dissociating inside the cell to lower intracellular pH, and interfering with the activity of key metabolic enzymes (such as those involved in coenzyme A synthesis), thereby inhibiting microbial growth. Studies show that the antimicrobial effect is strongest when the environmental pH is below 5.5, as this increases the proportion of undissociated propionic acid molecules.