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Protein Protocols Protein Protocols

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HPLC of Fluorescently Labeled Glycans 879<br />

Fig. 5. Analysis of bi-anennary, fucosylated, bisected glycans by reversse phase HPLC –<br />

comparison with normal phase HPLC showing complimentarily of separation techniques.<br />

3.8. Mass Spectrometry<br />

Samples may be further analyzed by mass spectrometry (MALDI-TOF or ESI/<br />

MS/MS) for confirmation of structures but generally require further desalting.<br />

1. It is often useful to perform the MS analysis on the glycan pool alongside the HPLC<br />

analysis but approx 10× more material is generally required.<br />

2. As all solvents used are volatile, fractions containing peaks from the HPLC run may be<br />

collected and dried in a vacuum centrifuge but cleanup may be required (see Note 12).<br />

4. Notes<br />

1. Waters System is recommended. Hewlett-Packard is also suitable. System with similar<br />

specification from other manufacturers may be suitable but must be capable of highpressure<br />

mixing of acetonitrile and aqueous solvents.<br />

2. Jasco or Waters is recommended but other detectors of similar specificity may be suitable.<br />

3. PeakTime is a program under development by Dr. Ed Hart at the Oxford Glycobiology<br />

Institute, which computes the GU or AU values and then compares them to those of standards.<br />

It will also analyze the products of enzymatic digestions for sequence analysis.<br />

4. Great care should be taking in the handling of hydrazine. Dry hydrazine of suitable quality<br />

may be obtained from Glyko or from Ludger Ltd. (Oxford, UK) .<br />

5. Availible from Glyko Inc.<br />

6. Suitable glycoproteins include ribonuclease B, bovine serum fetuin, and human serum<br />

haptoglobulin.<br />

7. The change in position of a band on SDS-PAGE indicates N-glycosylation. In some cases<br />

incomplete digestion may lead to the production of a series of bands corresponding to<br />

partially deglycosylated glycoprotein. Complete release is indicated by conversion to a<br />

single band at the lowest molecular weight.

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