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  • Title: Substrate and metabolite diffusion within model medium for soft cheese in relation to growth of Penicillium camembertii.
    Author: Aldarf M, Fourcade F, Amrane A, Prigent Y.
    Journal: J Ind Microbiol Biotechnol; 2006 Aug; 33(8):685-92. PubMed ID: 16491357.
    Abstract:
    Penicillium camembertii was cultivated on a jellified peptone-lactate based medium to simulate the composition of Camembert cheese. Diffusional limitations due to substrate consumption were not involved in the linear growth recorded during culture, while nitrogen (peptone) limitation accounted for growth cessation. Examination of gradients confirmed that medium neutralization was the consequence of lactate consumption and ammonium production. The diffusion of the lactate assimilated from the core to the rind and that of the ammonium produced from the rind to the core was described by means of a diffusion/reaction model involving a partial linking of consumption or production to growth. The model matched experimental data throughout growth.
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