The CCRC Spectral Database for PMAA's

- 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: 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.

To get more information or to make a comment regarding this database, contact William S. York .

1 Ciucanu (2006) Analytica Chimica Acta. 576: 147-155
2 York, et al. (1986) Methods in Enzymology. 118: 3-40

Non-Branched Hexopyranosyl Residues
Linkage Galp Glcp Manp Fucp Rhap GalpNAc GlcpNAc ManpNAc
T
2 - - -
3
4
6 - -

Singly Branched Hexopyranosyl Residues
Linkage Galp Glcp Manp Fucp Rhap GalpNAc GlcpNAc ManpNAc
2,3 - - -
2,4 - - -
2,6 - - - - -
3,4
3,6 - -
4,6 - -

Multiply Branched Hexopyranosyl Residues
Linkage Galp Glcp Manp Fucp Rhap GalpNAc GlcpNAc ManpNAc
2,3,4 - - -
2,3,6 - - - - -
2,4,6 - - - - -
3,4,6 - -

Non-Branched Pentopyranosyl and Pentofuranosyl Residues
Linkage Arap Ribp Xylp Araf Ribf
T
2
3
4 - -
5 - - -

Branched Pentopyranosyl and Pentofuranosyl Residues
Linkage Arap Ribp Xylp Araf Ribf
2,3
2,4 - -
2,5 - - -
3,4 - -
3,5 - - -
2,3,4 - -
2,3,5 - - -