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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Anal Chem. 2011 Sep 6;83(19):7492–7499. doi: 10.1021/ac201729v

Figure 1.

Figure 1

Chemical structure of a common complex type biantennary glycan structure shown as Haworth projections. Core pentasaccharide structure is highlighted in light grey, and acetamido groups are highlighted with dark grey ovals. Simple representations of glycan chains are shown in the lower right for this specific complex glycan (upper), and a high mannose type glycan (lower), with GlcNAc (grey squares), mannose (grey circles), galactose (white circles), and terminal sialic acids (grey diamonds). α(1–6) core fucose (fucosylation potentially also occurring antennae GlcNAcs) is shown as the grey triangle. Model compounds Sialyllactose (*without the N-acetyl group on the glucose) and GlcNAc-Asn representing portions of these chains used in this study are labeled. Triantennary and tetraantennary complex glycans would contain additional GlcNAc-Gal-NeuAc branches stemming from the terminal mannose moieties in the core pentasaccharide.