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HPAEC 805<br />

109<br />

Monosaccharide Analysis by HPAEC<br />

Elizabeth F. Hounsell, Michael J. Davies, and Kevin D. Smith<br />

1. Introduction<br />

Once the presence of monosaccharides has been established by chemical methods<br />

(see Chapter 108), the next stage of any glycoconjugate or polysaccharide analysis is to<br />

find out the amount of sugar and monosaccharide composition. The latter can give an<br />

idea as to the type of oligosaccharides present and, hence, indicate further strategies for<br />

analysis (1). Analysis by high-pH anion-exchange chromatography (HPAEC) with<br />

pulsed electrochemical detection, that is described here, is the most sensitive and easiest<br />

technique (2). If the laboratory does not have a biocompatible HPLC available that<br />

will withstand high salt concentrations, a sensitive labeling technique can be used with<br />

gel electrophoresis (3), e.g., that marketed by Glyko Inc. (Navato, CA) or Oxford<br />

GlycoSciences (Abingdon, UK), to include release of oligosaccharides/monosaccharides<br />

and labeling via reductive amination with a fluorescence label (4).<br />

2. Materials<br />

1. Dionex DX500 (Dionex Camberley, Surrey UK) or other salt/biocompatible gradient<br />

HPLC system (titanium or PEEK lined), e.g., 2 Gilson 302 pumps with 10-mL titanium<br />

pump heads, 802Ti manometric module, 811B titanium dynamic mixer, Rheodyne 7125<br />

titanium injection valve with Tefzel rotor seal (Gilson Medical Electronics, Villiersle-Bel,<br />

France).<br />

2. CarboPac PA1 separator (4 × 250 mm) and PA1 guard column (Dionex).<br />

3. Pulsed amperometric detector with Au working electrode (Dionex), set up with the following<br />

parameters:<br />

a. Time = 0 s E = + 0.1 V<br />

b. Time = 0.5 s E = + 0.1 V<br />

c. Time = 0.51 s E = + 0.6 V<br />

d. Time = 0.61 s E = + 0.6 V<br />

e. Time = 0.62 s E = – 0.8 V<br />

f. Time = 0.72 s E = – 0.8 V<br />

4. Reagent reservoir and postcolumn pneumatic controller (Dionex).<br />

5. High-purity helium.<br />

6. 12.5 M NaOH (BDH, Poole, UK).<br />

7. Reagent grade sodium acetate (Aldrich, Poole, UK).<br />

8. HPLC-grade H2O. From: The <strong>Protein</strong> <strong>Protocols</strong> Handbook, 2nd Edition<br />

Edited by: J. M. Walker © Humana Press Inc., Totowa, NJ<br />

805

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