Moisture Requirements for Growth and Metabolite Production by Lactic Acid Bacteria
AUTOR(ES)
Troller, J. A.
RESUMO
The effect of water activity (aw) reduction on growth and acid and diacetyl production by three lactic streptococci was studied. In addition, the influence of low moisture conditions on several bacteria of significance in the fermentation of sauerkraut was examined. The minimal aw supporting growth of dairy lactics was 0.93 in a medium adjusted with glycerol. Media adjusted with sucrose generally were more inhibitory than those in which glycerol was the humectant. Titratable acidity, although not related to the type of humectant, did depend on the aw of the medium and was directly related to the extent of growth. Diacetyl concentration increased in cultures of reduced aw when the media were adjusted with both humectants; however, the effect was greatest with glycerol. A lactic strain associated with sauerkraut fermentation appeared to grow at a lower minimal aw in a glycerol-adjusted medium than in a system adjusted with NaCl; however, none of the sauerkraut organisms grew at aw levels of <0.95 when NaCl was the solute. Acid production appeared to be related to the presence and extent of growth at all of the aw levels studied.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=244083Documentos Relacionados
- ADAPTATIONS IN GROWTH FACTOR REQUIREMENTS FOR LACTIC ACID BACTERIA12
- The Pantothenic Acid Requirements of Lactic Acid Bacteria 1
- Physiological Characteristics of Lactic Acid Bacteria Near the Maximum Growth Temperature: I. Growth and Acid Production 12
- Growth Factors for Bacteria: X. Additional Factors Required by Certain Lactic Acid Bacteria 1
- Factors Affecting Diacetyl Production by Lactic Acid Bacteria1
