The composition of all yoghurts was not significantly different:
3.02 ± 0.05% caseins, 0.797 ± 0.003% whey proteins, 3.95 ± 0.07%
total protein, and 13.77 ± 0.07% dry matter. The initial pH of all
blends after inoculation was not significantly different: pH
6.50 ± 0.04. The initial bacterial population was
3.1 ± 0.1 107 cfu mL1 with a streptococci-to-lactobacilli ratio of
57 ± 3 for all starters except for ST1, for which the initial bacterial
population and the streptococci-to-lactobacilli ratio were
1.88 ± 0.09 107 cfu mL1and 44 ± 3, respectively. At the end of
fermentation (181 ± 1 min), all yoghurt types had a final pH of
4.54 ± 0.03 and a lactic acid production of 0.52 ± 0.2%. The biological
population was statistically similar for all yoghurts at the
end of fermentation: 4.90 ± 0.06 108 cfu mL1 and
3.25 ± 0.03 108 cfu mL1 for streptococci and for lactobacilli,
respectively. Streptococci and lactobacilli populations were significantly
affected by yoghurt type and storage time, but data are not
shown, because the difference was small (less than
1.6 100 cfu mL1).