Marie Pascaline Rahelivao, H. Andriamanantoanina, A. Heyraud, M. Rinaudo
{"title":"Structure and Rheological Behaviour of Agar Extracted From Madagascar Sea Coast Algae","authors":"Marie Pascaline Rahelivao, H. Andriamanantoanina, A. Heyraud, M. Rinaudo","doi":"10.2174/1874343901407010001","DOIUrl":null,"url":null,"abstract":"Polysaccharide from an original red algae (Gelidium sp) was extracted with hot water, clarified, and precipitat- ed in presence of ethanol. NMR spectroscopic analyses and chromatographic separation after complete hydrolysis showed that this polysaccharide was composed predominantly of a repeating-unit based on 4-O-3,6-anhydro-α-L-galactopyranose and 3-O-β-D-galactopyranose confirming their agar nature. The Gelidium sp agar (representing 16 w % on the basis of dried crude algae) has a regular chemical structure and forms strong gels in aqueous medium. Its rheological behavior is examined as a function of polymer concentration and temperature.","PeriodicalId":22718,"journal":{"name":"The Open Macromolecules Journal","volume":"13 1","pages":"1-6"},"PeriodicalIF":0.0000,"publicationDate":"2014-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Open Macromolecules Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2174/1874343901407010001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
Polysaccharide from an original red algae (Gelidium sp) was extracted with hot water, clarified, and precipitat- ed in presence of ethanol. NMR spectroscopic analyses and chromatographic separation after complete hydrolysis showed that this polysaccharide was composed predominantly of a repeating-unit based on 4-O-3,6-anhydro-α-L-galactopyranose and 3-O-β-D-galactopyranose confirming their agar nature. The Gelidium sp agar (representing 16 w % on the basis of dried crude algae) has a regular chemical structure and forms strong gels in aqueous medium. Its rheological behavior is examined as a function of polymer concentration and temperature.
从一种原始红藻(Gelidium sp)中提取多糖，用热水澄清，并在乙醇存在下沉淀。核磁共振波谱分析和完全水解后的色谱分离表明，该多糖主要由基于4- o- 3,6-无水-α- l -半乳糖醛酸和3-O-β- d -半乳糖醛酸的重复单元组成，证实了它们的琼脂性质。Gelidium sp琼脂(在干燥的粗藻类基础上占16w %)具有规则的化学结构，并在水介质中形成强凝胶。研究了聚合物浓度和温度对其流变行为的影响。
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