Growth and activity of thermophylic lactic acid bacteria in ultrafiltered milk
1997
Radulovic, Z. | Obradovic, D. (Faculty of Agriculture, Belgrade - Zemun (Yugoslavia))
The buffer capacity of milk equivalent (CF=1) and retentates (CF=3 and CF=4) were studied. Furthermore, the influence of milk equivalent and these retentates on the growth and activity of four strains of thermophillic lactic acid bacteria: Streptococcus thermophilus 80, Streptococcus thermophilus S1, Lactobacillus bulgaricus BD-50 and Lactobacillus helveticus HD-50 had been observed. The growth and production of lactic acid of the tested strains in UF milk (ultrafiltered milk) were being observed during eight hours of fermentation. All the strains most easily lower pH value in milk equivalent and the decrease of pH value becomes slower with the decrease of concentration rate of retentate. With the increase of concentration rate of retentate, the growth of the tested strains was more intensive and the logarithmic growth phase was prolonged. The tested lactobacilli showed better production of lactic acid than streptococci.
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