Title:
Isolation and Chemical Characterization of Hemicelluloses from Rye Bran
Author(s):
Sárossy, Z., Egsgaard, H., Plackett, D.
Document(s):
Paper
Abstract:
Several methods have been suggested for hemicellulose isolation from cereals and cereal brans and extraction processes for water soluble hemicelluloses have been developed for soluble dietary fibers in the food industry. Using these methods, water soluble hemicelluloses can be readily extracted as high molecular weight polymers and the relevance of these materials can be evaluated in non-food applications. Water-soluble hemicelluloses of rye bran were extracted with a high-temperature treatment combined with enzymatic starch removal. After the hot water extraction, non-soluble fibers and protein fractions were separated and the washed fiber fraction was further treated with alkali (NaOH) solution with different solid to liquid ratios. The ratio of arabinoxylans (~65%) and ß-glucans (~25%) were similar in the water-extracted and alkali-extracted materials, however their ara/xyl ratio differed. The alkali-extracted arabinoxylan was less substituted with an ara/xyl ratio of 0.35, while the water-extracted material had an ara/xyl ratio of 0.54. High molar mass hemicellulose materials were isolated with an average molecular weight of 700 000 g/mol with both isolation processes.
Keywords:
agricultural residues, hemicellulose, isolation
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Biorefineries
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.7.17
Pages:
1794 - 1801
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.7.17
Price:
FREE
