Abstract
AbstractWe report here a study by negative‐ion fast‐atom bombardment (FAB) mass spectromatry of branched oligosacharides containing a 3‐O glyesidie linkage. Our result show that discrimination of the monosaccharide unit linked in the 3‐O position is made possible by the analysis of the negative‐ion FAB mass spectra. In the mass spectrum of A‐trisaccharide (α‐Fuc1‐2‐(α‐GalNAc1‐3)‐Gal) the peak at m/z 307 can be explained as elimination of a neutral molecule of GalNAc(221 u) from the molecular ion. Also in the mass spectrum of 3‐fucosyllaactose (α‐Fuc1‐3‐(β‐Gall‐4)‐Glc) an intense peak at m/z 323, corresponding to the elimination of the fucose linked at the 3 position of glucose is present. To investigate further the fragmentations of the 3‐O‐linked sugars, the negative‐ion FAB mass spectra of disaccharides have also been studied.
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