Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6595
Título: Modelling of lactic fermentation of carrot slices in salted brines
Outros títulos: Modelo de fermentación de rodajas de zanahorias en salmuera
Autor: Nabais, R. M.
Malcata, F. Xavier
Palavras-chave: Lactic fermentation
Data: 1997
Editora: Chapman & Hall / Sage Publications
Citação: NABAIS, R.M. ; MALCATA, F.X. - Modelling of lactic fermentation of carrot slices in salted brines = Modelo de fermentación de rodajas de zanahorias en salmuera . Food Science and Technology International. ISSN 1082-0132. 3:4 (1997) 263-283
Resumo: Increases in suspended biomass and variation in the concentrations of reducing sugars, salt, and lactic acid in brine containing sliced carrots were followed for a period of several days. A tentative unstructured, unsegregated model for the metabolism of suspended Lactobacillus plan tarum coupled with Fick's second law of diffusion for the transport of solutes within the carrot material was postulated. This general model was fitted by non-linear multiresponse regression analysis to an extensive set of experimental data encompassing several processing temperatures and initial brine concentrations. Maximum specific growth rates decreased with initial sodium chloride (NaCl) concentration and were maximal at ca 30°C leading to a peak concentration of reducing sugars in the brine. The lag phase of microbial growth in the brine is apparently disguised by the lag phase of sugar leaching from the carrots into the brine. Lactic acid was confirmed to be a growth-associated product. Intrinsic diffusivities of the various compounds considered ranged up to ca 10-11 m2/s, and varied with temperature according to the Arrhenius law; the maximum activation energy was at ca 8% (w/v) NaCl. The work developed is useful for the simulation and eventual optimization of pickled carrot manufacture.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6595
Versão do Editor: http://fst.sagepub.com/content/3/4/263.abstract
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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