title: Photochemical depolymerisation of dermatan sulfate and analysis of the generated oligosaccharides.
abstract: Radical depolymerisation is the method of choice for the depolymerisation of glycosaminoglycans (GAGs), especially when enzymatic depolymerisation cannot be performed due to the lack of suitable enzymes. The established Fenton type free radical depolymerisation generates radicals from a solution of H2O2 in the presence of Cu(2+) or Fe(2+). When applied to dermatan sulfate (DS), the Fenton type depolymerisation of DS (Panagos, Thomson, Bavington, & Uhrin, 2012) produced exclusively oligosaccharides with reducing end GalNAc, which was partially oxidised to acetylgalactosaminic acid. We report here the results of the TiO2 catalysed photochemical depolymerisation of DS. NMR analysis of these DS oligosaccharides revealed the presence of reducing end IdoA, observed for the first time. The reducing end acetylgalactosaminic acid was also detected. The photochemical depolymerisation method thus enables preparation of new types of GAG oligosaccharides suitable for further biochemical and biological investigation.
authors.affiliation: EastChem School of Chemistry, The University of Edinburgh, King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom; GlycoMar Ltd, European Centre for Marine Biotechnology, Oban, Scotland PA37 1QA, United Kingdom.
authors.forename: Charalampos G
authors.initials: CG
authors.lastname: Panagos
authors.affiliation: EastChem School of Chemistry, The University of Edinburgh, King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom.
authors.forename: David P
authors.initials: DP
authors.lastname: August
authors.affiliation: GlycoMar Ltd, European Centre for Marine Biotechnology, Oban, Scotland PA37 1QA, United Kingdom.
authors.forename: Christine
authors.initials: C
authors.lastname: Jesson
authors.affiliation: EastChem School of Chemistry, The University of Edinburgh, King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom. Electronic address: dusan.uhrin@ed.ac.uk.
authors.forename: Dušan
authors.initials: D
authors.lastname: Uhrín
mesh_terms: D003871:Dermatan Sulfate / Q000737:chemistry*; D009844:Oligosaccharides / Q000737:chemistry*; D055668:Photochemical Processes; D058105:Polymerization
chemical_list: D009844:Oligosaccharides; D003871:Dermatan Sulfate
keywords: Dermatan sulfate; Dermatan sulfate (Pubchem CID:32756); Ethylenediaminetetraacetic acid (PubChem CID: 6049); Glycosaminoglycans; NMR; Phosphate-buffered saline (PubChem CID: 24978514); Photochemical depolymerisation; Titanium dioxide (PubChem CID: 26042); Trimethylsilyl propionate (PubChem CID: 519321)