The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa
The "intermediate" fractions of the carrageenan of Iridaea undulosa, with are precipitated at 1.20-1.25m, 1.35-1.40m, and 1.55-1.65m concentrations of potassium chloride, are mixtures of μ/ν-carrageenans and λ-carrageenans. The λ-carrageenans contain mainly 3-linked, 2-sulfated (33.5-39.0%...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00086215_v172_n1_p139_Stortz |
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todo:paper_00086215_v172_n1_p139_Stortz2023-10-03T14:06:28Z The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa Stortz, C.A. Cerezo, A.S. The "intermediate" fractions of the carrageenan of Iridaea undulosa, with are precipitated at 1.20-1.25m, 1.35-1.40m, and 1.55-1.65m concentrations of potassium chloride, are mixtures of μ/ν-carrageenans and λ-carrageenans. The λ-carrageenans contain mainly 3-linked, 2-sulfated (33.5-39.0%) and 2,6-disulfated (5.6-11.8%) galactose units, together with 4-linked, 2-sulfated (1.8-5.9%), 6-sulfated and/or 2,6-disulfated (39.0-40.1%), and other 2,6-disubstituted (3.7-4.3%) galactose residues. The presence of this last unit suggests that some C-6 atoms must be either branching points or blocked by glycosidic linkages. When the compositions of these gel-forming λ-carrageenans are compared with those of the "soluble" λ-carrageenans from the same seaweed, it is clear that in the latter ones there is a higher diversification of the structural units and more "solubility-promoting" residues. © 1988. Fil:Stortz, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerezo, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00086215_v172_n1_p139_Stortz |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
The "intermediate" fractions of the carrageenan of Iridaea undulosa, with are precipitated at 1.20-1.25m, 1.35-1.40m, and 1.55-1.65m concentrations of potassium chloride, are mixtures of μ/ν-carrageenans and λ-carrageenans. The λ-carrageenans contain mainly 3-linked, 2-sulfated (33.5-39.0%) and 2,6-disulfated (5.6-11.8%) galactose units, together with 4-linked, 2-sulfated (1.8-5.9%), 6-sulfated and/or 2,6-disulfated (39.0-40.1%), and other 2,6-disubstituted (3.7-4.3%) galactose residues. The presence of this last unit suggests that some C-6 atoms must be either branching points or blocked by glycosidic linkages. When the compositions of these gel-forming λ-carrageenans are compared with those of the "soluble" λ-carrageenans from the same seaweed, it is clear that in the latter ones there is a higher diversification of the structural units and more "solubility-promoting" residues. © 1988. |
| format |
JOUR |
| author |
Stortz, C.A. Cerezo, A.S. |
| spellingShingle |
Stortz, C.A. Cerezo, A.S. The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| author_facet |
Stortz, C.A. Cerezo, A.S. |
| author_sort |
Stortz, C.A. |
| title |
The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| title_short |
The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| title_full |
The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| title_fullStr |
The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| title_full_unstemmed |
The λ-components of the "intermediate" fractions of the carrageenan form Iridaea undulosa |
| title_sort |
λ-components of the "intermediate" fractions of the carrageenan form iridaea undulosa |
| url |
http://hdl.handle.net/20.500.12110/paper_00086215_v172_n1_p139_Stortz |
| work_keys_str_mv |
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