4. Conclusion
Within a 90-day ripening period of the model cheese samples,
significant tyramine-positive and putrescine-positive producing
activity was observed in both samples of L. lactis subsp. cremoris
(CCDM 824 and CCDM 946) in a complex system of the model samples.
Higher tyramine-producing ability was observed in the strain
of L. lactis subsp. cremoris CCDM 946, where the final concentrations
of tyramine exceeded the limit of 500 mg/kg. In the case of
putrescine, higher putrescine-producing ability was found in the
strain of L. lactis subsp. cremoris CCDM 824, where the concentrations
of putrescine approached the limit of 900 mg/kg. Our results
suggest that the strains with BA forming abilities can be more
adaptable to difficult conditions in ripened cheese. They can probably
use the substrate for growth and survival in the real cheese
system more effectively.