Growth and survival of some probiotic strains in simulated ice cream conditions

Abstract

A Completely Randomized Design (CRD) experiment was applied in triplicates to evaluate the survival of our probiotic strains in simulated ice cream conditions. The growth and survival rate of these probiotic strains (Lactobacillus acidophilus, Lactobacillus casei, Bifidobacterium bifidum and Bifidobacterium longum) in varying amount of sucrose (10, 15, 20 and 25%), oxygen scavenging components (0.05% L-cysteine and 0.05% L-ascorbate) and temperatures (4 and -20°C during different periods of time (1, 2 and 3 months) were evaluated in MRS-broth medium. Optical density at 580 nm was used to measure growth. Lactobacilli strains proved to be highly resistant in comparison with Biffidobacteria strains. The viable cell number of Lactobacillus casei in different sucrose concentrations, different oxidoreduction potentials and refrigeration temperature was 1×1010, 2×108 and 5×107 cfu mL-1, respectively. Growth and survival rate of Lactobacillus casei showed to be the highest. © 2008 Asian Network for Scientific Information.