| Title: | Heparin Isomeric Oligosaccharide Separation Using Volatile Salt Strong Anion Exchange Chromatography |
| Author(s): | Miller RL; Guimond SE; Shivkumar M; Blocksidge J; Austin JA; Leary JA; Turnbull JE; |
| Address: | "Centre for Glycobiology, Department of Biochemistry, Institute of Integrative Biology, University of Liverpool , Crown Street, Liverpool L69 7ZB, United Kingdom. Departments of Molecular and Cellular Biology and Chemistry, University of California , 1 Shields Drive, Davis, California 95616, United States" |
| DOI: | 10.1021/acs.analchem.6b02801 |
| ISSN/ISBN: | 1520-6882 (Electronic) 0003-2700 (Linking) |
| Abstract: | "The complexity of heparin and heparan sulfate saccharides makes their purification, including many isomeric structures, very challenging and is a bottleneck for structure-activity studies. High-resolution separations have been achieved by strong anion exchange (SAX) chromatography on Propac PA1 and cetyltrimethylammonium (CTA)-C(18) silica columns; however, these entail subsequent desalting methodologies and consequent sample losses and are incompatible with orthogonal chromatography methodologies and, in particular, mass spectrometry. Here, we present the CTA-SAX purification of heparin oligosaccharides using volatile salt (VS) buffer. In VSCTA-SAX, the use of ammonium bicarbonate buffer for elution improves resolution through both weaker dissociation and conformational coordination of the ammonium across the sulfate groups. Using ion mobility mass spectrometry, we demonstrate that isomeric structures have different structural conformations, which makes chromatographic separation achievable. Resolution of such structures is improved compared to standard SAX methods, and in addition, VSCTA-SAX provides an orthogonal method to isolate saccharides with higher purity. Because ammonium bicarbonate is used, the samples can be evaporated rather than desalted, preventing substantial sample loss and allowing more effective subsequent analysis by electrospray mass spectrometry. We conclude that VSCTA-SAX is a powerful new tool that helps address the difficult challenge of heparin/heparan sulfate saccharide separation and will enhance structure-activity studies" |
| Keywords: | "Cetrimonium Compounds/chemistry Chromatography, Ion Exchange Heparin/*chemistry Ion Mobility Spectrometry Oligosaccharides/chemistry/*isolation & purification Salts/chemistry Stereoisomerism Volatile Organic Compounds/*chemistry;" |
| Notes: | "MedlineMiller, Rebecca L Guimond, Scott E Shivkumar, Maitreyi Blocksidge, Jemma Austin, James A Leary, Julie A Turnbull, Jeremy E eng G117/423/Medical Research Council/United Kingdom BB/I004343/1/Biotechnology and Biological Sciences Research Council/United Kingdom Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't 2016/11/02 Anal Chem. 2016 Dec 6; 88(23):11542-11550. doi: 10.1021/acs.analchem.6b02801. Epub 2016 Nov 14" |
