Czech J. Food Sci., 2007, 25(5):272-282 | DOI: 10.17221/680-CJFS

Characterisation of Lactobacillus rhamnosus VT1 and its effect on the growth of Candida maltosa YP1

Denisa Liptáková¹, Ľubomír Valík¹, Andrea Lauková², Viola Strompfová²

¹ Department of Nutrition and Food Assessment, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, Slovak Republic

² Institute of Animal Physiology, Slovak Academy of Sciences, Košice, Slovak Republic

The combined effect of initial amount of 18 h L. rhamnosus VT1 inoculum and incubation temperature on the growth of Candida maltosa YP1, an oxidative food spoilage yeast strain, was primarily modelled and studied by standard response surface methodology. This study resulted in the following linear regression equations characterising lag time and growth rate of C. maltosa YP1 in milk in competition with the potentially protective lactobacillus strain. Lag-phase of C. maltosa was strongly influenced by the amount of lactobacillus inoculum (V₀) and incubation temperature (1/T). The synergic effect of both these factors was also evident as results from the equation lag = -33.50 + 186.38 × V₀ × 1/T + 512.27 × 1/T - 5.511 × V₀ (R²_(λ) = 0.849). The growth rate was sufficiently described by the linear relation: Gr_Cm = -0.00046 + 0.0033 × T - 0.0016 × V_{0 (R²(Gr) = 0.847). On the basis of these equations, the mutual microbial interactions and the potential application of the lactobacillus strains to food protection are discussed.}

Keywords: Candida maltosa; Lactobacillus rhamnosus VT1; mathematical modelling

Published: October 31, 2007  Show citation