[en] Arabinoxylans (AXs) were extracted from destarched wheat bran (DWB) according to
different processes, with a view to their production at industrial scale. Two fractions (F3a and F3b, respectively purified on 10 kDa and 100 kDa ultrafiltration membranes) were obtained with low yields by treating DWB with an endoxylanase and this process left a solid residue exhausted in enzyme-extractable AXs (EDWB). F1 and F2 AX fractions were obtained by treatment with sodium hydroxide of respectively DWB and EDWB. The fraction F4 resulted from a hydrothermal treatment of EDWB in a pressure reactor, followed by ethanol precipitation. The different AX fractions were characterized and compared for the composition in monosaccharides, for the contents in fats and in ferulic, phytic and uronic acids, for the molecular mass distribution and the degrees of methylation and acetylation. The alkaline extractions gave one desesterified AX population with molecular mass (MM) higher than 670 kDa and arabinose/xylose ratios (Ara/Xyl) around 1. The enzyme and thermal treatments yielded AXs with two main populations in size-exclusion chromatography (the largest one at 5-12.5 kDa and a second one at 140-160 kDa), having overall Ara/Xyl of respectively 0.7 and 0.5 for both processes.
These data bring information about the influence of the process on the characteristics of AX fractions obtained from pretreated wheat bran. Here are also reported processes that enabled to recover enzyme-unextractable AXs from DWB, including an original and up-scalable hydrothermal extraction. Phytate contents of isolated AXs are described for the first time.
Research Center/Unit :
Gembloux Agro-Bio Tech
Disciplines :
Chemistry
Author, co-author :
Aguedo, Mario ; Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Fougnies, Christian; Cosucra Groupe Warcoing S.A.
DERMIENCE, Michael ; Université de Liège - ULiège > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique
Richel, Aurore ; Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Language :
English
Title :
Extraction by three processes of arabinoxylans from wheat bran and characterization of the fractions obtained
Publication date :
2014
Journal title :
Carbohydrate Polymers
ISSN :
0144-8617
eISSN :
1879-1344
Publisher :
Elsevier Science
Volume :
105
Pages :
317-324
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
BARCELONE (474 SPW 6511)
Funders :
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie
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