Linked Life Data

15107950

Source:http://linkedlifedata.com/resource/pubmed/id/15107950

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pubmed-article:15107950pubmed:dateCreated2004-10-25lld:pubmed
pubmed-article:15107950pubmed:abstractTextThe first two steps in xylose metabolism are catalyzed by NAD(P)H-dependent xylose reductase (XR) (EC 1.1.1.21) and NAD(P)-dependent xylitol dehydrogenase (XDH) (EC 1.1.1.9), which lead to xylose-->xylitol-->xylulose conversion. Xylitol has high commercial value, due to its sweetening and anticariogenic properties, as well as several clinical applications. The acid hydrolysis of sugarcane bagasse allows the separation of a xylose-rich hemicellulosic fraction that can be used as a substrate for Candida guilliermondii to produce xylitol. However, the hydrolysate contains acetic acid, an inhibitor of microbial metabolism. In this study, the effect of acetic acid on the activities of XR and XDH and on xylitol formation by C. guilliermondii were studied. For this purpose, fermentations were carried out in bagasse hydrolysate and in synthetic medium. The activities of XR and XDH were higher in the medium containing acetic acid than in control medium. Moreover, none of the fermentative parameters were significantly altered during cell culture. It was concluded that acetic acid does not interfere with xylitol formation since the increase in XR activity is proportional to XDH activity, leading to a greater production of xylitol and its subsequent conversion to xylulose.lld:pubmed
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pubmed-article:15107950pubmed:authorpubmed-author:VitoloMichele...lld:pubmed
pubmed-article:15107950pubmed:authorpubmed-author:das Graças...lld:pubmed
pubmed-article:15107950pubmed:authorpubmed-author:LimaLuanne...lld:pubmed
pubmed-article:15107950pubmed:authorpubmed-author:TorresFernand...lld:pubmed
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pubmed-article:15107950pubmed:pagination734-8lld:pubmed
pubmed-article:15107950pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15107950pubmed:year2004lld:pubmed
pubmed-article:15107950pubmed:articleTitleEffect of acetic acid present in bagasse hydrolysate on the activities of xylose reductase and xylitol dehydrogenase in Candida guilliermondii.lld:pubmed
pubmed-article:15107950pubmed:affiliationDepartamento de Biologia Celular, Universidade de Brasília, 70910-900 Brasilia, DF, Brazil.lld:pubmed
pubmed-article:15107950pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15107950pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed