Chemistry, properties, and phylogenetic implications of the methylated carrageenans from red algae of the genus Areschougia (Areschougiaceae, Gigartinales, Rhodophyta)
Chiovitti, A.; Kraft, G.T.; Bacic, A.; Craik, D.J.; Liao, M.-L. (2001). Chemistry, properties, and phylogenetic implications of the methylated carrageenans from red algae of the genus Areschougia (Areschougiaceae, Gigartinales, Rhodophyta). J. Phycol. 37(6): 1127-1137. https://dx.doi.org/10.1046/j.1529-8817.2001.01086.x
In: Journal of Phycology. Blackwell Science: New York. ISSN 0022-3646; e-ISSN 1529-8817, more
|  |
| Keywords |
Chemical compounds > Organic compounds > Carbohydrates > Saccharides > Polysaccharides
Classification > Taxonomy
Physics > Mechanics > Rheology
Products > Fishery products > Processed fishery products > Seaweed products > Carrageenins
Profiles
Properties > Physical properties > Mechanical properties > Viscosity
Areschougiaceae J. Agardh, 1876 [WoRMS]; Gigartinales [WoRMS]; Rhodophyta [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Chiovitti, A.
- Kraft, G.T.
- Bacic, A.
|
|
|
| Abstract |
The three Australian-endemic species comprising the genus Areschougia have been examined to determine the structure of their nonfibrillar wall components. The polysaccharide extracted from the most widely distributed species, A. congesta (Turner) J. Agardh, was shown by compositional analyses, Fourier transform infrared (FTIR) spectroscopy, linkage analysis, and 13C-NMR spectroscopy to be a carrageenan composed predominantly of the repeating disaccharides 6′-O-meth- ylcarrabiose 2,4′-disulfate, carrabiose 2,4′-disulfate (the repeating unit of ι-carrageenan), 4′,6′-O-(1-carboxyethylidene)carrabiose 2-sulfate, and 6′-O-methylcarrabiose 2-sulfate. The carrageenan also contained small amounts of 4-linked Galp residues, some bearing methyl ether substitution at O-3 and some possibly bearing sulfate ester and/or glycosyl substitutions at O-3. The A. congesta carrageenan had unique rheological properties, its gels having some similarities to those of commercial ι-carrageenan but with the viscosity of commercial λ-carrageenan. Polysaccharides from A. ligulata Harvey ex J. Agardh and A. stuartii Harvey were shown by constituent sugar and FTIR analyses to be sulfated galactans rich in mono-O-methylgalactose. The carrageenan structures of Areschougia spp. were consistent with those of the genera Rhabdonia, Erythroclonium, and Austroclonium, the other genera constituting the family Areschougiaceae. |
|
