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Protein Protocols Protein Protocols

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912 Hooker and James<br />

Fig. 4. Sialylated N-glycans associated with recombinant human IFN-γ released with<br />

PNGaseF, labeled with 2-aminobenzamide, and analyzed by MALDI-MS using 2,4,6trihydroxyacetophenone<br />

as matrix (A). The masses of individual N-glycans are used to assign<br />

an overall monosaccharide composition, including degree of sialylation (B). H, hexose; N,<br />

N-acetylhexosamine; D, deoxyhexose; and S, N-acetylneuraminic acid.<br />

analysis of sialylated glycans from IFN-γ provided quantitative information that compared<br />

favorably with analysis of the derivatized sialylated glycans by ion-exchange HPLC.<br />

4. Glycopeptides may be directly analyzed by ESI-MS (32,33), and the oligosaccharides<br />

sequenced following digestion with combinations of exoglycosidases (34) or glycoforms<br />

separated by liquid chromatography prior to analysis (35). Possibly the most powerful<br />

application of this technique has resulted from its interfacing with liquid chromatography<br />

which permits the separation and on-line identification of glycoproteins from protein

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