title: Effects of pretreatment of wheat bran on the quality of protein-rich residue for animal feeding and on monosaccharide release for ethanol production.
abstract: The effects of hydrothermal conditions for pretreating wheat bran on the quality of residual protein for animal feeding, and on monosaccharide release for ethanol production were studied according to a 4×2×2 design with the factors, temperature (120, 140, 160, and 180°C), acidity (pH 2.3 and 3.9), and retention time (5 and 10 min). Temperature affected the quality of residual protein for animal feeding. Pretreatment at 120 and 140°C did not affect O-methylisourea-reactive lysine in protein-rich wheat bran residue, although total lysine decreased with increasing temperature at pH 2.3. At temperatures higher than 140°C, reactive lysine decreased and melanoidins, furfural and 5-HMF increased. Lower acidity during pretreatment at 120 and 140°C increased the digestibility of the residual wheat protein in vitro by 36%. Pretreatment conditions did not substantially affect the release of monomeric xylose and arabinose by hemicellulases, which suggests that arabinoxylans in wheat bran are well accessible for enzymes.
authors.affiliation: Animal Nutrition Group, Wageningen University, Wageningen, The Netherlands. joost.vandenborne@wur.nl
authors.forename: Joost J G C
authors.initials: JJ
authors.lastname: van den Borne
authors.forename: Mirjam A
authors.initials: MA
authors.lastname: Kabel
authors.forename: Mickaël
authors.initials: M
authors.lastname: Briens
authors.forename: Antonius F B
authors.initials: AF
authors.lastname: van der Poel
authors.forename: Wouter H
authors.initials: WH
authors.lastname: Hendriks
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D000821:Animal Feed; D000431:Ethanol / Q000737:chemistry*; D006358:Hot Temperature; D006868:Hydrolysis; D009005:Monosaccharides / Q000737:chemistry*; D010940:Plant Proteins / Q000737:chemistry / Q000302:isolation & purification*; D014908:Triticum
chemical_list: D000596:Amino Acids; D009005:Monosaccharides; D010940:Plant Proteins; D000431:Ethanol