TY - JOUR
T1 - The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
AU - Estevez, José M.
AU - Ciancia, Marina
AU - Cerezo, Alberto S.
N1 - Funding Information:
This work was supported by Consejo Nacional de Investigaciones Cientı́ficas y Técnicas (CONICET) and University of Buenos Aires, Argentina. J.M.E. received a Grant-in-Aid of Research of the Phycological Society of America.
PY - 2004/10/20
Y1 - 2004/10/20
N2 - The hot-water extract from Kappaphycus alvarezii is composed of 74% of κ-carrageenans, 3% of μ-carrageenans, and 14% of sulfated agarans and dl-hybrid galactans with significant amounts of single stubs. The great tendency to retain Ca 2+ and Mg 2+ was studied. The galactans extracted with hot water from Kappaphycus alvarezii, after previous extraction at room temperature, are mainly composed of κ-carrageenans (∼74%) and μ-carrageenans (∼3%). However, a significant percentage of these galactans (at least 14%) is composed of sulfated agarans and, possibly, agaran-type sulfated dl-hybrid galactans. These agarans are partially substituted on C-2 or C-4 or disubstituted on both positions of the β-d-galactose units and on C-3 or C-2 and C-3 of the α-l-galactose residues with sulfate groups or single stubs of β-d-xylopyranose, d-glucopyranose, and galactose or with d-glucopyranosyl-(1→4)-d- glucopyranose side chains. Significant quantities of 2-O-methyl- and 3-O-methyl-l-galactose units are also present. A great tendency to retain Ca 2+ and Mg 2+, in spite of massive treatments with Na + and K + salts, was observed. The complexation between agarans and agarans - κ-carrageenans through divalent cations and the possible zipper-type carbohydrate - carbohydrate interactions would be two complementary mechanisms of interactions.
AB - The hot-water extract from Kappaphycus alvarezii is composed of 74% of κ-carrageenans, 3% of μ-carrageenans, and 14% of sulfated agarans and dl-hybrid galactans with significant amounts of single stubs. The great tendency to retain Ca 2+ and Mg 2+ was studied. The galactans extracted with hot water from Kappaphycus alvarezii, after previous extraction at room temperature, are mainly composed of κ-carrageenans (∼74%) and μ-carrageenans (∼3%). However, a significant percentage of these galactans (at least 14%) is composed of sulfated agarans and, possibly, agaran-type sulfated dl-hybrid galactans. These agarans are partially substituted on C-2 or C-4 or disubstituted on both positions of the β-d-galactose units and on C-3 or C-2 and C-3 of the α-l-galactose residues with sulfate groups or single stubs of β-d-xylopyranose, d-glucopyranose, and galactose or with d-glucopyranosyl-(1→4)-d- glucopyranose side chains. Significant quantities of 2-O-methyl- and 3-O-methyl-l-galactose units are also present. A great tendency to retain Ca 2+ and Mg 2+, in spite of massive treatments with Na + and K + salts, was observed. The complexation between agarans and agarans - κ-carrageenans through divalent cations and the possible zipper-type carbohydrate - carbohydrate interactions would be two complementary mechanisms of interactions.
KW - Agarans
KW - Ca - polysaccharide interactions
KW - Carrageenans
KW - Kappaphycus alvarezii
KW - Red seaweed
KW - Structure determination
KW - Sulfated galactans
UR - http://www.scopus.com/inward/record.url?scp=5144222391&partnerID=8YFLogxK
U2 - 10.1016/j.carres.2004.08.010
DO - 10.1016/j.carres.2004.08.010
M3 - Article
C2 - 15476719
AN - SCOPUS:5144222391
SN - 0008-6215
VL - 339
SP - 2575
EP - 2592
JO - Carbohydrate Research
JF - Carbohydrate Research
IS - 15
ER -