Improved growth model for two-stage continuous cultures of Lactobacillus helveticus

An unstructured model for growth and lactic acid production during two-stage continuous cultures of Lactobacillus helveticus was previously developed. The Verlhust model was considered to describe growth kinetics. Production models was based on modified Luedeking-Piret expressions involving an inhib...

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Autores principales:	Bouguettoucha,Abdallah, Balannec,Béatrice, Nacef,Saci, Amrane,Abdeltif
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2010
Materias:	continuous culture growth lactic acid fermentation substrate limitation unstructured models
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500007
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spelling	oai:scielo:S0717-345820100005000072011-05-24Improved growth model for two-stage continuous cultures of Lactobacillus helveticusBouguettoucha,AbdallahBalannec,BéatriceNacef,SaciAmrane,Abdeltif continuous culture growth lactic acid fermentation substrate limitation unstructured models An unstructured model for growth and lactic acid production during two-stage continuous cultures of Lactobacillus helveticus was previously developed. The Verlhust model was considered to describe growth kinetics. Production models was based on modified Luedeking-Piret expressions involving an inhibitory effect for the first stage (seed culture) and a nutritional limitation effect for the second stage (culture). To account for the decrease of the biomass concentration observed in the second stage, the dilution rate Dc was replaced by an exponential term of the dilution rate <img border=0 width=84 height=36 src="http://fbpe/img/ejb/v13n5/a07/image002.gif" align=middle>in the growth and product relations. Contrarily to the previous model, the important decrease of the biomass concentration observed at steady state in the second stage at high dilution rates, namely close to wash out, was correctly described by the new model. It also proved to satisfactory describes production data and volumetric productivity.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.13 n.5 20102010-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500007en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	continuous culture growth lactic acid fermentation substrate limitation unstructured models
spellingShingle	continuous culture growth lactic acid fermentation substrate limitation unstructured models Bouguettoucha,Abdallah Balannec,Béatrice Nacef,Saci Amrane,Abdeltif Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
description	An unstructured model for growth and lactic acid production during two-stage continuous cultures of Lactobacillus helveticus was previously developed. The Verlhust model was considered to describe growth kinetics. Production models was based on modified Luedeking-Piret expressions involving an inhibitory effect for the first stage (seed culture) and a nutritional limitation effect for the second stage (culture). To account for the decrease of the biomass concentration observed in the second stage, the dilution rate Dc was replaced by an exponential term of the dilution rate <img border=0 width=84 height=36 src="http://fbpe/img/ejb/v13n5/a07/image002.gif" align=middle>in the growth and product relations. Contrarily to the previous model, the important decrease of the biomass concentration observed at steady state in the second stage at high dilution rates, namely close to wash out, was correctly described by the new model. It also proved to satisfactory describes production data and volumetric productivity.
author	Bouguettoucha,Abdallah Balannec,Béatrice Nacef,Saci Amrane,Abdeltif
author_facet	Bouguettoucha,Abdallah Balannec,Béatrice Nacef,Saci Amrane,Abdeltif
author_sort	Bouguettoucha,Abdallah
title	Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
title_short	Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
title_full	Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
title_fullStr	Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
title_full_unstemmed	Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
title_sort	improved growth model for two-stage continuous cultures of lactobacillus helveticus
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500007
work_keys_str_mv	AT bouguettouchaabdallah improvedgrowthmodelfortwostagecontinuousculturesoflactobacillushelveticus AT balannecbeatrice improvedgrowthmodelfortwostagecontinuousculturesoflactobacillushelveticus AT nacefsaci improvedgrowthmodelfortwostagecontinuousculturesoflactobacillushelveticus AT amraneabdeltif improvedgrowthmodelfortwostagecontinuousculturesoflactobacillushelveticus
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Improved growth model for two-stage continuous cultures of Lactobacillus helveticus

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