Advanced

On-line estimation of sugar concentration for control of fed-batch fermentation of lignocellulosic hydrolyzates by Saccharomyces cerevisiae

Nilsson, Anneli LU ; Taherzadeh, M J and Lidén, Gunnar LU (2002) In Bioprocess and Biosystems Engineering2000-01-01+01:00 25(3). p.183-191
Abstract
A feed control strategy, based on estimated sugar concentrations, was developed with the purpose of avoiding severe inhibition of the yeast Saccharomyces cerevisiae during fermentation of spruce hydrolyzate. The sum of the fermentable hexose sugars, glucose and mannose, was estimated from on-line measurements of carbon dioxide evolution rate and biomass concentration by use of a simple stoichiometric model. The feed rate of the hydrolyzate was controlled to maintain constant sugar concentration during fed-batch fermentation, and the effect of different set-point concentrations was investigated using both untreated and detoxified hydrolyzates. The fed-batch cultivations were evaluated with respect to cellular physiology in terms of the... (More)
A feed control strategy, based on estimated sugar concentrations, was developed with the purpose of avoiding severe inhibition of the yeast Saccharomyces cerevisiae during fermentation of spruce hydrolyzate. The sum of the fermentable hexose sugars, glucose and mannose, was estimated from on-line measurements of carbon dioxide evolution rate and biomass concentration by use of a simple stoichiometric model. The feed rate of the hydrolyzate was controlled to maintain constant sugar concentration during fed-batch fermentation, and the effect of different set-point concentrations was investigated using both untreated and detoxified hydrolyzates. The fed-batch cultivations were evaluated with respect to cellular physiology in terms of the specific ethanol productivities, ethanol yields, and viability of the yeast. The simple stoichiometric model used resulted in a good agreement between estimated sugar concentrations and off-line determinations of sugar concentrations. Furthermore, the control strategy used made it possible to maintain a constant sugar concentration without major oscillations in the feed rate or the sugar concentration. For untreated hydrolyzates the average ethanol productivity could be increased by more than 130% compared to batch fermentation. The average ethanol productivity was increased from 0.12 to 0.28 g/g h. The productivity also increased for detoxified hydrolyzates, where an increase of 16% was found (from 0.50 to 0.58 g/g h). (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
inhibitors, dilute acid hydrolyzate, ethanol, Saccharomyces cerevisiae, fed-batch control
in
Bioprocess and Biosystems Engineering2000-01-01+01:00
volume
25
issue
3
pages
183 - 191
publisher
Springer
external identifiers
  • wos:000178915900007
  • pmid:14508677
  • scopus:0036380161
ISSN
1615-7605
DOI
10.1007/s00449-002-0293-x
language
English
LU publication?
yes
id
f235361f-c826-4af1-bc53-e73dab7cc8ec (old id 324847)
date added to LUP
2007-11-02 13:27:27
date last changed
2017-07-09 04:22:51
@article{f235361f-c826-4af1-bc53-e73dab7cc8ec,
  abstract     = {A feed control strategy, based on estimated sugar concentrations, was developed with the purpose of avoiding severe inhibition of the yeast Saccharomyces cerevisiae during fermentation of spruce hydrolyzate. The sum of the fermentable hexose sugars, glucose and mannose, was estimated from on-line measurements of carbon dioxide evolution rate and biomass concentration by use of a simple stoichiometric model. The feed rate of the hydrolyzate was controlled to maintain constant sugar concentration during fed-batch fermentation, and the effect of different set-point concentrations was investigated using both untreated and detoxified hydrolyzates. The fed-batch cultivations were evaluated with respect to cellular physiology in terms of the specific ethanol productivities, ethanol yields, and viability of the yeast. The simple stoichiometric model used resulted in a good agreement between estimated sugar concentrations and off-line determinations of sugar concentrations. Furthermore, the control strategy used made it possible to maintain a constant sugar concentration without major oscillations in the feed rate or the sugar concentration. For untreated hydrolyzates the average ethanol productivity could be increased by more than 130% compared to batch fermentation. The average ethanol productivity was increased from 0.12 to 0.28 g/g h. The productivity also increased for detoxified hydrolyzates, where an increase of 16% was found (from 0.50 to 0.58 g/g h).},
  author       = {Nilsson, Anneli and Taherzadeh, M J and Lidén, Gunnar},
  issn         = {1615-7605},
  keyword      = {inhibitors,dilute acid hydrolyzate,ethanol,Saccharomyces cerevisiae,fed-batch control},
  language     = {eng},
  number       = {3},
  pages        = {183--191},
  publisher    = {Springer},
  series       = {Bioprocess and Biosystems Engineering2000-01-01+01:00},
  title        = {On-line estimation of sugar concentration for control of fed-batch fermentation of lignocellulosic hydrolyzates by Saccharomyces cerevisiae},
  url          = {http://dx.doi.org/10.1007/s00449-002-0293-x},
  volume       = {25},
  year         = {2002},
}