Journal
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Volume 147, Issue 2, Pages 112-119Publisher
ELSEVIER
DOI: 10.1016/j.ijfoodmicro.2011.03.017
Keywords
Lactococcus lactis subsp lactis; Lactococcus lactis subsp cremoris; Tyramine; Lactose; NaCl; Aero/anaerobiosis; Ion-exchange chromatography
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Funding
- Ministry of Education, Youth and Sports of the Czech Republic [MSM 7088352101, MSM 2672286101]
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The aim of this work was to study, under model conditions, combined effects of the concentration of lactose (0-1% w/v), NaCl (0-2% w/v) and aero/anaerobiosis on the growth and tyramine production in 3 strains of Lactococcus lactis subsp. lactis and 2 strains of L lactis subsp. cremoris. The levels of the factors tested were chosen with respect to the conditions which can occur during the real process of natural cheese production, including the culture temperature (10 +/- 1 degrees C). In all strains tested, tyrosine decarboxylation was most influenced by NaCl concentration; the highest production of tyramine was obtained within the culture with the highest (2% w/v) salt concentration applied. Two of the strains L. lactis subsp. lactis produced tyramine only in broth with the highest NaCl concentration tested. In the remaining 3 strains of L lactis, tyramine was detected under all conditions applied. The tested concentration of lactose and aero/anaerobiosis had a less significant effect on tyramine decarboxylation. However, it was also found that at the same concentrations of NaCl and lactose, a higher amount of tyramine was detected under anaerobic conditions. In all strains tested, tyramine decarboxylation started during the active growth phase of the cells. (C) 2011 Elsevier B.V. All rights reserved.
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