MALDI-MS analyses of Band 2 and of the NGLs of reference compounds.
A and B, MALDI-MS and CID-MS/MS of Band 2, respectively. C to E, MALDI-CID-MS/MS of NGLs of three isomeric hexasaccharides pLNH, pLNnH and pLNH-b. used as reference compounds. The m/z ion in red in panel C is a dehydrated ion characteristic of the “type 1-type 1” backbone sequence in pLNH-b. The corresponding ions are lacking for pLNH and pLNnH that have the “type 1-type 2” sequence, and also for Band 2.