Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 318855
Title Modeling in the interactions of Lactobacillus curvatus colonies in solid medium : consequences for food quality an safety
Author(s) Malakar, P.K.; Martens, D.E.; Breukelen, W. van; Boom, R.M.; Zwietering, M.H.; Riet, K. van 't
Source Applied and Environmental Microbiology 68 (2002)7. - ISSN 0099-2240 - p. 3432 - 3441.
Department(s) Bioprocess Engineering
Food Microbiology Laboratory
Food Process Engineering
Sub-department of Food and Bioprocess Engineering
Publication type Refereed Article in a scientific journal
Publication year 2002
Abstract The growth process of Lactobacillus curvatus colonies was quantified by a coupled growth and diffusion equation incorporating a volumetric rate of lactic acid production. Analytical solutions were compared to numerical ones, and both were able to predict the onset of interaction well. The derived analytical solution modeled the lactic acid concentration profile as a function of the diffusion coefficient, colony radius, and volumetric production rate. Interaction was assumed to occur when the volume-averaged specific growth rate of the cells in a colony was 90␘f the initial maximum rate. Growth of L. curvatus in solid medium is dependent on the number of cells in a colony. In colonies with populations of fewer than 105 cells, mass transfer limitation is not significant for the growth process. When the initial inoculation density is relatively high, colonies are not able to grow to these sizes and growth approaches that of broth cultures (negligible mass transfer limitation). In foods, which resemble the model solid system and in which the initial inoculation density is high, it will be appropriate to use predictive models of broth cultures to estimate growth. For a very low initial inoculation density, large colonies can develop that will start to deviate from growth in broth cultures, but only after large outgrowth.
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