FIGURE 1. In vitro tests of acid tolerance (A) can be predictive of survival of probiotic strains in yogurt (B). In A, the viable counts of 3 strains
of bifidobacteria were measured at time 0 () and after incubation for 105 min at 37 C in 0.2 mol HCl-KCl/L buffer, pH 2.0, plus 0.1% peptone ().
This correlated well with the ability of the strains to survive in yogurt, as shown in B. The data for B were supplied by L Tran and M Harvey from
Gist-brocades Australia, Moorebank, Sydney, Australia.