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Biotechnol Biofuels. 2017 May 02;10:112. doi: 10.1186/s13068-017-0803-3. eCollection 2017.

Characterisation of non-degraded oligosaccharides in enzymatically hydrolysed and fermented, dilute ammonia-pretreated corn stover for ethanol production.

Biotechnology for biofuels

M C Jonathan, J DeMartini, S Van Stigt Thans, R Hommes, M A Kabel

Affiliations

  1. Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
  2. DuPont Industrial Biosciences (Genencor Division), 925 Page Mill Road, Palo Alto, CA 94304 USA.
  3. DuPont Industrial Biosciences (Genencor International B.V.), Archimedesweg 30, 2333 CN Leiden, The Netherlands.

PMID: 28469707 PMCID: PMC5414315 DOI: 10.1186/s13068-017-0803-3

Abstract

BACKGROUND: Corn stover is lignocellulosic biomass that has potential to be used as raw material for bioethanol production. In the current research, dilute ammonia pretreatment was used to improve the accessibility of corn stover carbohydrates to subsequently added hydrolytic enzymes. Some carbohydrates, however, were still present after enzymatic hydrolysis and fermentation. Hence, this research was aimed to characterise the recalcitrant carbohydrates, especially the oligosaccharides that remained after hydrolysis and fermentation of dilute ammonia-pretreated corn stover (DACS).

RESULTS: About 35% (w/w) of DACS carbohydrates remained after enzymatic hydrolysis and fermentation of the released monosaccharides. One-third of these recalcitrant carbohydrates were water soluble and composed of diverse oligosaccharides. By using UHPLC-MS

CONCLUSIONS: Around one-third of the 35% (w/w) recalcitrant DACS carbohydrates remained as water-soluble saccharides. In this study, more than 50 recalcitrant oligosaccharides were detected, which mostly composed of xylosyl and/or glucosyl residues. The most pronounced oligosaccharides were UAXOS and XGOS. Hence, α-glucuronidase and α-xylosidase were suggested to be added to the enzyme mixture to degrade these oligosaccharides further, and hence the fermentation yield is potentially increased.

Keywords: Aldouronic acid; Corn stover; Glucuronamide; Hexenuronamide; Hexenuronic acid; Xylan; Xyloglucan

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