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Propanoic acid is an antimicrobial food additive.
Propanoic acid is an antimicrobial food additive.
The metabolic fate of propionates varies in different microorganisms . Some have enzyme systems that can convert succinate to propionyl-coenzyme A and through various further steps to propionate, CO2, or propionyl phoshpate . Still others can convert propionic acid to B-alanine or directly to CO2 . Whatever the case, the inhibiting effect for microbials is likely related to competition with acetate in the acetokinase system, to the blockage of pyruvate conversion to acetyl-coenzyme A and to interference with B-alanine in pantothenic acid syntheses . Moreover, other studies suggest the antimicrobial activity of propionic acid revolves around its ability to reduce the pH of its immediate environment to levels of acidity that are harmful to pathogenic microbes as well as its ability to dissociate such that its lipid soluble undissociated form is capable of entering microbial cells . Additionally, there are also studies that suggest that propionic acid's antifungal activity may be the result of propionyl-CoA inhibiting glucose metabolism in certain species of fungus via the accumulation of the CoA-derivative .
Propanoic acid and various direct sodium or calcium salt formulations of the acid are currently most commonly approved and indicated by organizations like the FDA and EMA for use as an antibacterial food additive preservative in animal feed and food for human consumption . Similarly, although the use of propanoic acid or any of its direct sodium or calcium salt formulations as excipient ingredients in pharmaceuticals is not necessarily a major role for the compound today, sodium propionate was used in some vaginal cream preparations indicated for cervicitis, cervical tears, and/or postcauterization, postcryosurgery, and postconization of the cervix . In such products, the sodium propionate was primarily used to elicit a preservative, bacteriostatic effect while other active ingredients combined in the formulation like urea, benzalkonium chloride, inositol, and methionine and cystine amino acids facilitated debridement, enhanced medication spread, epithelialization promotion, and wound healing, respectively . Nevertheless, a great variety of propionic acid derivatives exist as separate pharmaceuticals, each with their own unique therapeutic categories, pharmacodynamics, and pharmacokinetics.
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