title: The system of low-molecular-weight carrageenans and agaroids from the room-temperature-extracted fraction of Kappaphycus alvarezii.
abstract: The room-temperature-extracted fraction from the red seaweed Kappaphycus alvarezii consists mainly of low-molecular-weight carrageenans, with structural dispersion around a basic kappa-pattern. This dispersion results from: (a) low percentages of 3,6-anhydrogalactose and the presence of precursor units; (b) important quantities of 6-O-methyl beta-D-galactose (4-sulfate) residues; (c) significant amounts of iota-repeating structure, and (d) small amounts of non-sulfated and disulfated beta-D-galactose residues. Significant quantities of alpha-L-galactose units suggest the presence of agaroids, as it has been reported in several other carrageenophytes.
authors.affiliation: Departamento de Química Orgánica (CIHIDECAR-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria-Pabellón 2, Argentina.
authors.forename: J M
authors.initials: JM
authors.lastname: Estevez
authors.forename: M
authors.initials: M
authors.lastname: Ciancia
authors.forename: A S
authors.initials: AS
authors.lastname: Cerezo
mesh_terms: D002351:Carrageenan / Q000737:chemistry* / Q000302:isolation & purification; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange; D005690:Galactose / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D009005:Monosaccharides / Q000737:chemistry; D011189:Potassium Chloride / Q000737:chemistry; D012624:Seaweed / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014867:Water / Q000378:metabolism; D014994:Xylose / Q000737:chemistry
chemical_list: D009005:Monosaccharides; D014867:Water; D011189:Potassium Chloride; D002351:Carrageenan; D014994:Xylose; D005690:Galactose