- To see the Partially Methylated Alditol Acetate
(PMAA) derived from a glycosidically linked sugar residue,
scroll down the PMAA table until you find its entry and mouse
over it.
- Click on the entry to see the electron-impact mass spectrum
(EI-MS) of the PMAA.
As shown
here
PMAAs are formed by the following procedure1:
O-Methylation of the complex glycan.
Hydrolysis of the methylated glycan.
Reduction of the resulting partially methylated sugars with borodeuteride.
O-Acetylation of the resulting partially methylated alditols.
The position of the O-acetyl and O-methyl groups on the
PMAA reflect the ring form and linkage positions of the glycosyl residue
in the original glycan. PMAAs are usually analyzed by gas chromatography (gc)
coupled with electron-impact mass spectrometry (ei-ms).
As shown
here,
fragmentation patterns of PMAAs in the mass spectrometer follow
well-defined pathways, allowing the mass spectra of these derivatives
to be easily recognized2.
The PMAA derivatives displayed in this database were prepared by
Larry Elvebak, who also recorded and interpreted the mass spectra.
All software for the graphical display and retrieval of spectra
was developed by William S. York.
To get more information or to make a comment regarding this database,
contact William S. York .
