Document Detail


Structural characterisation of underivatised olive pulp xylo-oligosaccharides by mass spectrometry using matrix-assisted laser desorption/ionisation and electrospray ionisation.
MedLine Citation:
PMID:  12415545     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Purified olive pulp glucuronoxylans, with a Xyl/GlcA ratio of 7:1, were subjected to mild acid hydrolysis and the mixture of oligosaccharides obtained was fractionated by size exclusion chromatography. One elution fraction representative of low molecular weight oligosaccharides was analysed by mass spectrometry using matrix-assisted laser desorption/ionisation (MALDI) and electrospray ionisation (ESI) as ionisation methods, in the positive mode. Both types of spectra showed cationised molecules [M + Na](+) of xylo-oligosaccharides in a range below m/z 1,000. The xylo-oligosaccharide structures identified were series of neutral oligosaccharides of xylose (Xyl(n), n = 3-7), of acidic oligosaccharides substituted by one glucuronic acid (Xyl(n)GlcA, n = 3-5) and by two glucuronic acid residues (Xyl(n)GlcA(2), n = 2 and 3), and also of acidic oligosaccharides substituted with one 4-O-methylglucuronic acid residue (Xyl(n)meGlcA, n = 2-4). The proposed structures were confirmed by tandem mass (MS/MS) spectra obtained using collision induced dissociation of the molecular ions. Fragmentation of cationised adducts of neutral Xyl(n) yielded C- and A-type fragments, while ammonium adducts mainly yielded B-type fragments. The fragmentation of the sodium adducts of acidic oligosaccharides (Xyl(n)meGlcA, Xyl(n)GlcA) resulted in the loss of the substituting residue (GlcA or meGlcA) as the predominant fragment, while the corresponding ammonium adducts yielded B-type fragments.
Authors:
Ana Reis; Manuel A Coimbra; P Domingues; A J Ferrer-Correia; M Rosário M Domingues
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Rapid communications in mass spectrometry : RCM     Volume:  16     ISSN:  0951-4198     ISO Abbreviation:  Rapid Commun. Mass Spectrom.     Publication Date:  2002  
Date Detail:
Created Date:  2002-11-04     Completed Date:  2003-01-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8802365     Medline TA:  Rapid Commun Mass Spectrom     Country:  England    
Other Details:
Languages:  eng     Pagination:  2124-32     Citation Subset:  IM    
Copyright Information:
Copyright 2002 John Wiley & Sons, Ltd.
Affiliation:
Chemistry Department, University of Aveiro, Campus Santiago, 3810-193 Aveiro, Portugal.
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MeSH Terms
Descriptor/Qualifier:
Carbohydrate Sequence
Molecular Sequence Data
Molecular Structure
Molecular Weight
Olea / chemistry*
Oligosaccharides / analysis,  chemistry*
Plant Extracts / chemistry
Spectrometry, Mass, Electrospray Ionization*
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization*
Chemical
Reg. No./Substance:
0/Oligosaccharides; 0/Plant Extracts

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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