Dear Netters:
This is my first posting to this news group and
I have a question about the chemical shifts of
the H-1 atoms in complex-type carbohydrates.
I am especially interested in the question if there is
a difference to be expected in the ppm values of the
H-1 atoms of the terminal Gal residues of complex type
carbohydrates if these would be bound beta-1,3 instead
of the usual beta-1,4 linkage and how big this difference would be?
As far as I have figured out from literature (e.g. Vliegenthart et al.)
the typical values for H-1 of the terminal Gal, for the N-acetyllactosamine
type, are at about 4.47 ppm, but I have not found yet any typical values
for beta-1,3 linkages of the Gal residue to the preceding GlcNAc residue.
Does anybody know where to look up some details about this
problem or has anybody experience with these two
complex-type structures?
Christian Frosch
Internet: frosch at mzdmza.zdv.uni-mainz.de
Merry Christmas and a Happy New Year to all
