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The linkage of 4-O-methyl-l-galactopyranose in the agar polymers from Gracilaria verrucosa

✍ Scribed by Yannis Karamanos; Mauricio Ondarza; Fabienne Bellanger; Daniel Christiaen; Serge Moreau

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 513 KB
Volume: 187
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(89)80057-6

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✦ Synopsis

4-0-Methyl-L-galactopyranose was found in agar preparations from Grucilaria verrucosa. Its content varied with the culture conditions and with the tissue age. Highly substituted portions having this residue were obtained by enzymic degradation with P-agarase I. Permethylation analysis and 13C-n.m.r. spectroscopy demonstrated the linkage of this sugar to O-6 of the 3-O-linked-Dgalactopyranose units. The definition of agar should take into account this occurrence of 4-0-methyl-r-galactose side groups.

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