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Monitoring Glycoprotein Heterogeneity 911<br />

Fig. 3. Heterogeneous glycoprotein populations directly analyzed by ESI-MS. This technique<br />

provides highly resolved mass analyses with a mass accuracy of 0.01% (1 Dalton/10 kDa).<br />

In this example, individual transgenic mouse derived recombinant human IFN-γ components<br />

were assigned a C-terminal polypeptide cleavage site and an overall monosaccharide<br />

composition.<br />

shown to ionize effectively, with picomole to femtomole sensitivity, as deprotonated<br />

molecular ions using 2,4,6-trihydroxyacetophenone as matrix in the presence of ammonium<br />

citrate (31). Further improvements in sensitivity and resolution may be obtained by<br />

derivatization of oligosaccharides with fluorophores such as 2-aminoacridome (AMAC)<br />

or 2-aminobenzamidine (AB; Fig. 4). Integration of MALDI-MS peak areas obtained on

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