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HPLC of Fluorescently Labeled Glycans 873<br />

Fig. 2. Analysis of IgG N-glycans realeased by hydrazinolysis on normal phase HPLC. The<br />

top panel shows the calibration curve for conversion of retention time into glucose units based<br />

on a third order polynomial. The middle panel shows the separations of glucose oligomers from<br />

the dextran ladder. The lower panel shows the separation of the fluorescently labeled glycans<br />

from IgG with structures corresponding to the major peaks indicated.<br />

e. Software for this purpose is currently being developed at the Oxford Glycobiology<br />

Institute (see Note 3).<br />

3.4. Reverse-Phase Chromatography<br />

1. Buffers:<br />

a. ammonium formate–triethylamine 50 mM formic acid adjusted to pH 5.0 with triethylamine.<br />

b. Acetonitrile: HPLC grade; see Subheading 2.2.

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