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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Moreira, Ana S. P. da Costa, Elisabete V. Evtuguin, Dmitry V. Coimbra, Manuel A. Nunes, Fernando M. Domingues, M. Rosário M. |
| Description | Country affiliation: Portugal Author Affiliation: Moreira AS ( Mass Spectrometry Center and QOPNA, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.) |
| Abstract | The oxidation of -(1 â 5)-L-arabinotriose (Ara3), an oligosaccharide structurally related to side chains of coffee arabinogalactans, was studied in reaction with hydroxyl radicals generated under conditions of Fenton reaction (Fe(2+)/H2O2). The acidic and neutral oxidation products were separated by ligand exchange/size-exclusion chromatography, subsequently identified by electrospray ionisation mass spectrometry (ESI-MS) and structurally characterised by tandem MS (ESI-MS/MS). In acidic fraction were identified several oxidation products containing an acidic residue at the corresponding reducing end of Ara3, namely arabinonic acid, and erythronic, glyceric and glycolic acids formed by oxidative scission of the furanose ring. In neutral fractions were identified derivatives containing keto, hydroxy and hydroperoxy moieties, as well as derivatives resulting from the ring scission at the reducing end of Ara3. In both acidic and neutral fractions, beyond the trisaccharide derivatives, the corresponding di- and monosaccharide derivatives were identified indicating the occurrence of oxidative depolymerisation. The structural characterisation of these oxidation products by ESI-MS/MS allowed the differentiation of isobaric and isomeric species of acidic and neutral character. The species identified in this study may help in detection of roasting products associated with the free radical-mediated oxidation of coffee arabinogalactans. |
| File Format | HTM / HTML |
| ISSN | 10765174 |
| Issue Number | 4 |
| Volume Number | 49 |
| e-ISSN | 10969888 |
| Journal | Journal of Mass Spectrometry |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 2014-04-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Spectroscopy Discipline Chemistry Techniques Arabinose Chemistry Hydroxy Acids Hydroxyl Radical Oligosaccharides Spectrometry, Mass, Electrospray Ionization Methods Hydrogen-ion Concentration Oxidation-reduction Tandem Mass Spectrometry Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Medicine |
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