title: Structural analysis of Gigartina pistillata carrageenans (Gigartinaceae, Rhodophyta).
abstract: The chemical structure of carrageenans produced by the gametophytic and tetrasporophytic life cycle phases of Gigartina pistillata has been determined by permethylation analysis, IR and 13C NMR spectroscopies. The chemistry of the galactans varies according to the biological phases of the plant, the gametophytic alga produces heterogeneous kappa-iota type carrageenan containing minor amounts of nu-carrabiose. The tetrasporophytic alga synthesizes a complex sulfated galactan composed of lambda-, xi-, pi-carrabioses and sulfated carrabioses containing 3-linked galactopyranose 2,6-disulfate.
authors.affiliation: Laboratoire de Biochimie et de Biotechnologies Marines, Département de Biologie, Faculté des Sciences, Université Ibn Tofail, B.P. 133, 1400, Kenitra, Morocco.
authors.forename: A
authors.initials: A
authors.lastname: Amimi
authors.forename: A
authors.initials: A
authors.lastname: Mouradi
authors.forename: T
authors.initials: T
authors.lastname: Givernaud
authors.forename: N
authors.initials: N
authors.lastname: Chiadmi
authors.forename: M
authors.initials: M
authors.lastname: Lahaye
mesh_terms: D002351:Carrageenan / Q000737:chemistry*; D004187:Disaccharides / Q000737:chemistry; D006868:Hydrolysis; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D013055:Spectrophotometry, Infrared
chemical_list: D004187:Disaccharides; D002351:Carrageenan