Journal
CARBOHYDRATE POLYMERS
Volume 96, Issue 2, Pages 503-509Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.04.009
Keywords
Hyaluronan; Oligosaccharides; Free radical depolymerization; Mass spectrometry
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Funding
- National Institutes of Heath [GM38060, HL096972, ES020903]
- China Scholarship Council
- Natural Science Foundation of China [30800858]
- Shandong Natural Science Foundation [ZR2010CQ020]
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Hydroxyl radicals are widely implicated in the oxidation of carbohydrates in biological and industrial processes and are often responsible for their structural modification resulting in functional damage. In this study, the radical depolymerization of the polysaccharide hyaluronan was studied in a reaction with hydroxyl radicals generated by Fenton Chemistry. A simple method for isolation and identification of the resulting non-sulfated oligosaccharide products of oxidative depolymerization was established. Hyaluronan oligosaccharides were analyzed using ion-pairing reversed phase high performance liquid chromatography coupled with tandem electrospray mass spectrometry. The sequence of saturated hyaluronan oligosaccharides having even- and odd-numbers of saccharide units, afforded through oxidative depolymerization, were identified. This study represents a simple, effective 'finger-printing' protocol for detecting the damage done to hyaluronan by oxidative radicals. This study should help reveal the potential biological outcome of reactive-oxygen radical-mediated depolymerization of hyaluronan. (C) 2013 Elsevier Ltd. All rights reserved.
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