Kinetic modeling of brewery's spent grain autohydrolysis

Isothermal autohydrolysis treatments of brewery's spent grain were used as a method for hemicellulose solubilization and xylo-oligosaccharides production. The time course of the concentrations of residual hemicelluloses (made up of xylan and arabinan) and reaction products were determined in ex...

Full description

Saved in:
Bibliographic Details
Published in:Biotechnology progress 2005-01, Vol.21 (1), p.233-243
Main Authors: Carvalheiro, F, Garrote, G, Parajo, J.C, Pereira, H, Girio, F.M
Format: Article
Language:English
Subjects:
arabinans
Arabinose
autohydrolysis
Biological and medical sciences
Biotechnology
Biotechnology - methods
brewers grains
Decomposition
Edible Grain - chemistry
equations
Fundamental and applied biological sciences. Psychology
Furfural
Grain
hemicellulose
Hydrolysis
Industrial Waste
Kinetics
mathematical models
Mathematics
Models, Statistical
monosaccharides
oligosaccharides
Oligosaccharides - chemistry
Polysaccharides - chemistry
Q1
reaction kinetics
Solubilization
Temperature
Temperature effects
Time Factors
Xylan
Xylans - chemistry
xylooligosaccharides
Xylose
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Isothermal autohydrolysis treatments of brewery's spent grain were used as a method for hemicellulose solubilization and xylo-oligosaccharides production. The time course of the concentrations of residual hemicelluloses (made up of xylan and arabinan) and reaction products were determined in experiments carried out at temperatures in the range from 150 to 190 degrees C using liquid-to-solid ratios of 8 and 10 g/g. To model the experimental findings concerning to brewery's spent grain autohydrolysis several kinetic models based on sequential pseudo-homogeneous first-order reactions were tested. Xylan and arabinan were assumed to yield oligosaccharides, monosaccharides (xylose or arabinose), furfural, and other decomposition products in consecutive reaction steps. The models proposed provide a satisfactory interpretation of the hydrolytic conversion of xylan and arabinan. An additional model merging the two proposed models for xylan and arabinan degradation assuming that furfural was formed from both pentoses was developed and the results obtained are discussed. The dependence of the calculated kinetic coefficients on temperature was established using Arrhenius-type equations.
ISSN:8756-7938
1520-6033
DOI:10.1021/bp049764z