High-performance liquid chromatography/electrospray ionization ion-trap mass spectrometry for analysis of oligosaccharides derivatized by reductive amination and N,N-dimethylation

被引:32
作者
Broberg, Anders [1 ]
机构
[1] Swedish Univ Agr Sci, Dept Chem, SE-75007 Uppsala, Sweden
关键词
graphitized carbon column; oligosaccharides; reductive amination; electrospray ionization; ion-trap mass spectrometry; fucose migration; milk oligosaccharides;
D O I
10.1016/j.carres.2007.04.020
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Milk oligosaccharides derivatized by reductive amination with benzylamine followed by N,N-dimethylation (DMBA-oligosaccharides), were analyzed by high-performance liquid chromatography/electro spray ionization ion-trap mass spectrometry (HPLC/ESI-ITMS). Separation of DMBA-oligosaccharides was achieved on a graphitized carbon column eluted with aqueous acetonitrile and the DMBA-oligosaccharides were detected by positive-ion mode ESI-ITMS allowing sample amounts down to similar to 30 fmol of single DMBA-oligosaccharides injected on the HPLC column. MS/MS operation of the mass spectrometer resulted in the detection of diagnostic fragments, mainly belonging to the Y-series, allowing differentiation between isomeric milk oligosaccharides. HPLC/ESI-ITMS/MS/MS experiments indicated the migration of fucose residues of the DMBA milk oligosaccharides to the modified reducing end glucose residue during analysis, a migration previously only observed for proton adduct ions. (c) 2007 Published by Elsevier Ltd.
引用
收藏
页码:1462 / 1469
页数:8
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