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BIBTEX RIS

Alkali modification of carrageenans. Part IV. Porphyrans as model compounds

2000; Elsevier BV; Volume: 42; Issue: 3 Linguagem: Inglês

10.1016/s0144-8617(99)00176-9

1879-1344

Miguel D. Noseda, Adriano Gonçalves Viana, Maria Eugênia R. Duarte, Alberto S. Cerezo,

Marine and coastal plant biology

The rate of alkaline cyclization of porphyran is in the same order as those of carrageenan model compounds containing non-sulfated β-d-galactose units, showing that the cyclization of the α-galactosyl units does not depend on the β-d-adjacent sugar residues when they carry no sulfate groups. It also suggests that there is no influence of the α-d-galactose 2-sulfate on the cyclization rate, in spite of its change from the equatorial to the axial position during the conversion of the 4C1 to 1C4 chair conformation.