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880 Merry<br />

Fig. 6. Example of exoglycosidase sequencing an O-glycan on normal phase HPLC.<br />

SPG - β1,4 specific galactosidase (Streptococcus pneumoniae), other exoglycosidse abbreviations<br />

as in Fig. 4.<br />

8. The presence of most salts, dyes, or detergents will interfere with hydrazinolysis. The<br />

sample must also be completely anhydrous.<br />

9. All glassware used should be soaked in 4 M nitric acid for 4 h and thoroughly washed in<br />

water before use.<br />

10. The use of cryogenic drying by placing under high vacuum connected to a trap of charcoal<br />

submerged in liquid nitrogen for a period of 72 h as described by Ashford et al. (34) is<br />

recommended.<br />

11. It may be necessary to apply slight pressure to the top of the column or to use a suitable<br />

vacuum apparatus.<br />

12. Double-distilled (subboiling point) water should be used for mass spectrometric analysis.<br />

Suitable techniques for post-HPLC cleanup and for mass spectrometry by electrospray (8)<br />

and by MALDI (9) have been described recently.<br />

Acknowledgments<br />

The advice and help of the members of the Glycoimmunology group at the Oxford<br />

Glycobiology Institute, Director Professor R. A. Dwek and Group Leader Dr. Pauline<br />

Rudd, is gratefully acknowledged. In particular, I would like to thank Dr. Louise Royle

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