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A. Usov, S. Yarotsky, A. Shashkov (1980)
13C‐nmr spectroscopy of red algal galactansBiopolymers, 19
(1978)
Polysac - charides of algae . XXIV . The application of 13 C - NMR spectroscopy to the analysis of the structures of polysaccharides of the agar group
C. Rochas, M. Rinaudo, M. Vincendon (1980)
Structural and conformational investigation of carrageenansBiopolymers, 19
J. Led, S. Petersen (1978)
Heating effects in carbon-13 NMR spectroscopy on aqueous solutions caused by proton noise decoupling at high frequenciesJournal of Magnetic Resonance, 32
A. Usov, E. Ivanova, A. Shashkov (1983)
Polysaccharides of Algae XXXIII: Isolation and 13C-NMR Spectral Study of Some New Gel-forming Polysaccharides from Japan Sea Red Seaweeds, 26
Yaphe (1985)
Greer and Purification and properties of iota - carrageenase from a marine bacterium CanMicrobiol
Heyraud
Rochas and Acid and enzymic hydrolysis of kappa carrageenan PolymerBull, 198
D. Rees (1969)
Structure, conformation, and mechanism in the formation of polysaccharide gels and networks.Advances in carbohydrate chemistry and biochemistry, 24
E. Percival (1978)
Sulfated Polysaccharides of theRhodophyceae—A Review
(1983)
Spectroscopic characterization and conformation of oligo kappa carragee
(1978)
198 L Analysis of ê - é hybrid carrageenans with ê - carrageenase , i - carrageenase and 13 C - NMR
C. Greer, W. Yaphe (1984)
Purification and properties of ι-carrageenase from a marine bacteriumCanadian Journal of Microbiology, 30
S. Bociek, A. Darke, D. Welti, D. Rees (1980)
The 13C-NMR spectra of hyaluronate and chondroitin sulphates. Further evidence on an alkali-induced conformation change.European journal of biochemistry, 109 2
C. Rochas, A. Heyraud (1981)
Acid and enzymic hydrolysis of Kappa carrageenanPolymer Bulletin, 5
(1978)
Heating effects
C. Rochas, M. Rinaudo, M. Vincendon (1983)
Spectroscopic characterization and conformation of oligo kappa carrageenansInternational Journal of Biological Macromolecules, 5
(1984)
Distor - tionless enhancement of NMR signals by polarization transfer , 7
(1980)
13 C - NMR spectroscopic analysis of agar , , ê - carrageenan and i - carrageenan
(1971)
Enzymic hydrolysis of agar and properties of bacterial agarase
(1980)
Some consequences of high frequencies in NMR spectrometry
B. Cox, K. Opheim, H. Teschemacher, A. Goldstein (1975)
Purification and propertiesLife Sciences, 16
Usov (1980)
a and b : previous assignments in the literature XXVIII ( irccr ft / : Straedml tutijik of by NMR tpectroncopy Fig DEPT sequence of i - carrageenan and IJC - NMR of i - carrageenan at KOBotanica Marina
(1978)
Polysaccharides of algae
Abstract C-NMR spectroscopy is a powerful tool for structural analysis of carrageenans, but the assignments for some of the carbon atoms in the repeating disaccharide have not been determined conclusively. lota-neocarratetraose sulfate and iota-neocarrahexaose sulfate, generated by enzymatic hydrolysis of iota-carrageenan, provided model compounds for determining the correct assignments of carbons in the repeat unit of the parent polymer. A comparison of integrated values of resonance peaks in the 13C-NMR spectra was used to assign peaks to carbons of the repeat units at the non-reducing and reducing extremities and the internal repeat unit of the iota-oligosaccharides. The correct assignments for C-2 of 3-O-ß-D-galactopyranosyl-4-sulfate and C-6 of 4-O-3,6-anhydro-a-D-galactopyranosyl-2-sulfate were obtained using a specialized NMR technique (distortionless enhancement by polarization transfer). Introduction Carrageenans are a spectrum of structurally related cell wall polysaccharides, extracted with water, from certain members of the Rhodophyceae (red algae). Carrageenans are composed of alternately al-»3, 1--»4 linked D-galactopyranose residues, and are classified according to substitutions (commonly ester sulfate and the 3,6-anhydrogalactopyranose form of the 4-linked residue) on a repeating disaccharide (Fig. 1) (Rees 1969, Percival 1978, McCandless and Craigie 1979). Carrageenans, and the structurally related agars, are well known for their ability to form thermo-reversible gels
Botanica Marina – de Gruyter
Published: Jan 1, 1985
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