The yeast Scheffersomyces amazonensis is an efficient xylitol producer

This study assessed the efficiency of Scheffersomyces amazonensis UFMG-CM-Y493 T , cultured in xylose-supplemented medium (YPX) and rice hull hydrolysate (RHH), to convert xylose to xylitol under moderate and severe oxygen limitation. The highest xylitol yields of 0.75 and 1.04 g g −1 in YPX and RHH...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2016-12, Vol.32 (12), p.207-207, Article 207
Main Authors: Cadete, Raquel M., Melo-Cheab, Monaliza A., Viana, Adriana L., Oliveira, Evelyn S., Fonseca, César, Rosa, Carlos A.
Format: Article
Language:English
Subjects:
Aldehyde Reductase - metabolism
Applied Microbiology
Biochemistry
Biomass
Biomedical and Life Sciences
Biotechnology
Culture Media - chemistry
D-Xylulose Reductase - metabolism
Debaromyces - classification
Debaromyces - enzymology
Debaromyces - growth & development
Dehydrogenases
Environmental Engineering/Biotechnology
Experiments
Fermentation
Fungal Proteins - metabolism
Glucose
Industrial Microbiology
Life Sciences
Microbiology
NAD - metabolism
NADP - metabolism
Oxygen
Productivity
Proteins
Rice hulls
Short Communication
Xylitol - biosynthesis
Xylitol - metabolism
Xylose - metabolism
Yeast
Yeasts
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Summary:This study assessed the efficiency of Scheffersomyces amazonensis UFMG-CM-Y493 T , cultured in xylose-supplemented medium (YPX) and rice hull hydrolysate (RHH), to convert xylose to xylitol under moderate and severe oxygen limitation. The highest xylitol yields of 0.75 and 1.04 g g −1 in YPX and RHH, respectively, were obtained under severe oxygen limitation. However, volumetric productivity in RHH was ninefold decrease than that in YPX medium. The xylose reductase (XR) and xylitol dehydrogenase (XDH) activities in the YPX cultures were strictly dependent on NADPH and NAD + respectively, and were approximately 10% higher under severe oxygen limitation than under moderate oxygen limitation. This higher xylitol production observed under severe oxygen limitation can be attributed to the higher XR activity and shortage of the NAD + needed by XDH. These results suggest that Sc. amazonensis UFMG-CM-Y493 T is one of the greatest xylitol producers described to date and reveal its potential use in the biotechnological production of xylitol.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-016-2166-5