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Application of bioenergetics to modelling the microbial conversion of D ‐xylose to 2,3‐butanediol
Author(s) -
Jansen Norman B.,
Flickinger Michael C.,
Tsao George T.
Publication year - 1984
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260260603
Subject(s) - bioenergetics , chemistry , 2,3 butanediol , fermentation , xylose metabolism , xylose , biochemistry , oxygen , assimilation (phonology) , yield (engineering) , respiration , cellular respiration , thermodynamics , biology , organic chemistry , botany , linguistics , philosophy , physics , mitochondrion
During the oxygen limiting growth of Klebsiella oxytoca , the xylose metabolism may be considered as consisting of three components: conversion to 2,3‐butanediol by “fermentation,” oxidation to carbon dioxide by respiration, and assimilation to cell mass. The amount of energy required for the assimilation of cell mass is assumed to determine the extent to which the two energy producing reactions occur. The activity of each energy producing pathway is also determined by the availability of oxygen and by the energy yield of each pathway. These relationships can be quantified by equating the ATP required for growth and maintenance to the ATP produced by the energy producing reactions. The resulting equation for butanediol production appears similar to the Luedeking and Piret model where the parameters α and β are related to the maximum cell yield from ATP and the maintenance energy requirement. These parameters were estimated from 14 batch fermentations, and the resulting simulation was used to describe the effects of the oxygen transfer rate and the initial xylose concentration on the yields and rates of the 2,3‐butanediol fermentation.