title: Chemical investigation of carrageenan from the red alga Sarconema filiforme (Gigartinales, Rhodophyta) of Indian waters.
abstract: Sulphated galactan (SF(A)) containing alpha (alpha), iota (i) and pyruvated alpha-carrageenans (17.6:18.8:25.3 mol %) was extracted and characterized from Sarconema filiforme of Indian waters. The SF(A) and its alkali modified derivative (SF(AM)) were composed of D-galactose, 3, 6-anhydro-D-galactose, 6-O-methylated-D-galactose (64.5:23.0:9.8 and 59.6:29.8:7.6 mol %) respectively. The linkage analysis, physicochemical analysis, infra red and 13C nuclear magnetic resonance spectra of SFA along with linkage analysis of the desulphated derivative (SF(D)) of SFA, reveals that it was a hybrid/combination of alpha/iota carrageenan as well as 3-linked 4',6'-O-(1-carboxyethylidene)-galactose (pyruvated alpha carrageenan) and 6-O-methylated alpha-carrageenan. The flow behavior of SF(A) obtained from rheological measurements suggested strong network formation in presence of 1% aqueous KCl and CaCl2 solutions.
authors.affiliation: Marine Biotechnology & Ecology Discipline, Central Salt & Marine Chemical Research Institute, Council of Scientific & Industrial Research (CSIR), G.B. Marg, Bhavnagar-364002, Gujarat, India.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Kumar
authors.forename: Gaurav K
authors.initials: GK
authors.lastname: Mehta
authors.forename: Kamalesh
authors.initials: K
authors.lastname: Prasad
authors.forename: Ramavtar
authors.initials: R
authors.lastname: Meena
authors.forename: Arup K
authors.initials: AK
authors.lastname: Siddhanta
mesh_terms: D002351:Carrageenan / Q000737:chemistry*; D019156:Indian Ocean; D015394:Molecular Structure; D000461:Rhodophyta / Q000737:chemistry*
chemical_list: D002351:Carrageenan