|Extracellular carbohydrate polymers from five desert soil algae with different cohesion in the stabilization of fine sand grain|
|Chunxiang Hu; Yongding Liu; Berit Smestad Paulsen; Dirk Petersen; Dag Klaveness; Paulsen, BS, Univ Oslo, Sch Pharm, POB 1068 Blindern, N-0316 Oslo, Norway
|Source Publication||CARBOHYDRATE POLYMERS
|Abstract||Extracellular polymeric substances (EPS) from four filamentous cyanobacteria Microcoleus vaginatus, Scytonema javanicum, Phormidium tenue and Nostoc sp. and a coccoid single-cell green alga Desmococcus olivaceus that had been separated from desert algal crusts of Tegger desert of China, were investigated for their chemical composition, structure,and physical properties. The EPS contained 7.5-50.3% protein (in polymers ranging from 14 to more than 200 kD, SDS-PAGE) and 16.2-46.5% carbohydrate (110-460 kD, GFC). 6-12 kinds of monosaccharides, including 2-O-methyl rhamnose, 2-O-methyl glucose, and N-acetyl glucosamine were found. The main carbohydrate chains from M. vaginatus and S. javanicum consisted mainly of equal proportion of Man, Gal and Glc, that from P. tenue consisted mainly of arabinose, glucose and rhamnose. Arabinose was present in pyranose form, mainly alpha-L 1 --> 3 linked, with branches on C4 of almost half of the units. Glucose was responsible for the terminal units, in addition of having some units as beta1 --> 3 and some as beta1 --> 4 linked. Rhamnose was mainly 1 --> 3 linked with branches on C2 on half of the units. The carbohydrate polymer from D. olivaceus was composed mainly of beta1 --> 4 linked xylose, galactose and glucose. The galactose part was present both in beta-pyranose and -furanose forms. Arabinose in alpha-L-furanose form was mainly present as 1 --> 2 and 1 --> 2, 5 linked units, rhamnose only as alpha 1 --> 3 and xylose as beta 1 --> 4. The backbone of the polysaccharide from Nostoc sp. was composed of beta-1 --> 4 linked xylose, galactose and glucose. Most of the glucose was branched on position C6, terminal glucose and 2-O-methyl glucose units are also present. The relationship between structure, physical properties and potential biological function is discussed. (C) 2003 Elsevier Ltd. All rights reserved.|
Desert Algal Crust
Extracellular Polymeric Substances
|Department||Univ Oslo, Sch Pharm, N-0316 Oslo, Norway; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; Univ Oslo, Dept Chem, N-0315 Oslo, Norway; Univ Oslo, Dept Biol, N-0315 Oslo, Norway
; Polymer Science
|Corresponding Author||Paulsen, BS, Univ Oslo, Sch Pharm, POB 1068 Blindern, N-0316 Oslo, Norway|
Chunxiang Hu,Yongding Liu,Berit Smestad Paulsen,et al. Extracellular carbohydrate polymers from five desert soil algae with different cohesion in the stabilization of fine sand grain[J]. CARBOHYDRATE POLYMERS,2003,54(1):33-42.
Chunxiang Hu,Yongding Liu,Berit Smestad Paulsen,Dirk Petersen,Dag Klaveness,&Paulsen, BS, Univ Oslo, Sch Pharm, POB 1068 Blindern, N-0316 Oslo, Norway.(2003).Extracellular carbohydrate polymers from five desert soil algae with different cohesion in the stabilization of fine sand grain.CARBOHYDRATE POLYMERS,54(1),33-42.
Chunxiang Hu,et al."Extracellular carbohydrate polymers from five desert soil algae with different cohesion in the stabilization of fine sand grain".CARBOHYDRATE POLYMERS 54.1(2003):33-42.
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