Document Detail

Membrane-assisted processing of xylooligosaccharide-containing liquors.
MedLine Citation:
PMID:  16848528     Owner:  NLM     Status:  MEDLINE    
Liquors from rice husk autohydrolyis, containing xylooligosaccharides, other saccharides, and nonsaccharide compounds, were subjected to two selected processing schemes to increase the proportion of substituted xylooligosaccharides in refined liquors. Nanofiltration through a ceramic membrane with a molecular mass cutoff of 1000 Da allowed simultaneous concentration and purification; this latter derived from the preferential removal of monosaccharides and nonsaccharide compounds. When liquors were nanofiltered to achieve a volume reduction factor of 5 operating at a transmembrane pressure of 14 bar, 58.6% of the nonsaccharide components and 20.9-46.9% of monosaccharides were kept in retentate, in comparison with 92% of xylooligosaccharides and glucooligosaccharides. When nanofiltered liquors were subjected to double ion-exchange processing, a final product with a nonsaccharide content near 9 kg/100 kg of nonvolatile components was obtained at a yield of 10.90 kg/100 kg oven dry rice husks. Alternatively, when nanofiltered liquors were subjected to ethyl acetate extraction and further double ion-exchange processing, a purified product with a nonsaccharide content of 5.66 kg/100 kg of nonvolatile components was obtained at a yield of 9.94 kg/100 kg oven dry rice husks. The nonsaccharide components remaining in the final concentrate were mainly made up of phenolic and nitrogen-containing compounds.
Rodolfo Vegas; Susana Luque; José Ramón Alvarez; José Luis Alonso; Herminia Domínguez; Juan Carlos Parajó
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  54     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-07-19     Completed Date:  2006-08-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5430-6     Citation Subset:  IM    
Department of Chemical Engineering, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain.
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MeSH Terms
Filtration / instrumentation*
Oligosaccharides / analysis*,  isolation & purification
Oryza sativa / chemistry*
Seeds / chemistry*
Xylans / analysis*,  isolation & purification
Reg. No./Substance:
0/Oligosaccharides; 0/Solutions; 0/Xylans

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