Background. Lactic acid bacteria (LAB) were pointed out to produce ferulic acid es- terase. Except the release of phenolic acids front esterified forms, it was postulated that the biotransformations of these compounds can occur during the bacterial growth. In the presented work, the biotransformation of ferulic acid by Lactobacillus acidophilus KI and three Bifidibacterium strains (B. animalis Bi30, B. catenulatum KD 14 and B. longum KN 29) was studied. Material and methods. The microorganisms were grown in media containing methyl esters of phenolic acids as carbon sources. The feruloyl esterase activity as well as the contents of phenolic acids in supematants were estimated using HPLC-DAD. Results. The enzyme activity was evaluated using methyl ferulate exclusively, but p- -coumaric acid and another chromatographic peak (probably caffeic acid, but its identity was not positively confirmed by the DAD analysis) were present in reaction mixtures containing the supematants of Lactobacillus acidophilus KI cultivars with methyl p-coumarate or methyl syringate. Both peaks of p-coumaric acid and another phenolic compound were also present in the Solutions containing the supematants of B. catenulatum and B. longum grown in the presence of methyl vanillate and the supematants of B. animalis Bi30 grown using methyl p-coumarate, methyl syringate or methyl vanillate. Conclusions. The results suggest a distinct ability of the studied LAB strains to transform free ferulic acid yielding p-coumaric acid and probably caffeic acid although no mechanism involved in this transformation was proposed and closer characterised in the frames of this work.
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