Carbohydrate Research p. 225 - 236 (1985)
Update date:2022-08-05
Topics:
Bretting, Hagen
Jacobs, Guenter
Benecke, Ingrid
Koenig, Wilfried A.
Thiem, Joachim
The occurrence of L-galactose (L-Gal) was investigated in twelve preparations of snail galactans from nine different species.L-Gal (11-15percent) was found not only in members of the family Helicidae, a highly developed group among the Pulmonata, but was detected also in a galactan of the oldest phylogenetic subclass of snails in the Prosobranchiata.To determine the position of the L-Gal residues, the galactans of Arianta arbustorum, Cepaea nemoralis, and Helix pomatia were methylated and hydrolysed, and the partially methylated Gal derivatives were isolated.Each derivative was O-demethylated and the ratio of D- and L-galactose was determined by g.l.c. of the trifluoroacetylated methyl glycosides using a chiral stationary phase.L-Gal (22-34percent) was detected only in the tetra-O-methyl fractions, and hence L-Gal occupies exclusively terminal non-reducing positions.
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