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Effect of temperature on the microaerophilic metabolism of Pachysolen tannophilus.

Identifieur interne : 002225 ( Main/Exploration ); précédent : 002224; suivant : 002226

Effect of temperature on the microaerophilic metabolism of Pachysolen tannophilus.

Auteurs : A. Converti [Italie] ; P. Perego ; J M. Domínguez ; S S. Silva

Source :

RBID : pubmed:11240189

Abstract

Xylitol production by Pachysolen tannophilus from detoxified hemicellulose hydrolysate was investigated under microaerophilic conditions at temperature ranging from 20 to 40 degrees C. A carbon balance previously proposed to study the influence of pH was used in this work to evaluate the amounts of carbon source (xylose) utilised in competitive metabolic ways: reductive production of xylitol, ethanol fermentation and respiration. At pH = 5.5 more than 83% of xylose was reduced to xylitol at 25 < T < 30 degrees C, whereas respiration became the main process at low temperature (71.1% at 20 degrees C). At high temperature, on the other hand, all three processes took place at comparable rate, consuming at 40 degrees C nearly the same percentage of carbon source (33-35%). Finally, the maximum values of volumetric productivity calculated at variable temperature were used to estimate the main thermodynamic parameters of both xylitol production (Deltah* = 105.4 kJ mol(-1); Deltas* = -13.2 J mol(-1) K(-1)) and thermal deactivation (Deltah*(D) = 210.5 kJ mol(-1); Deltas*(D) = 3.63 J mol(-1) K(-1)).

PubMed: 11240189


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