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Carbohydrates, uronic acids and alkali extractable carbohydrates in contrasting marine and estuarine sediments: Distribution, size fractionation and partial chemical characterization

DRS at CSIR-National Institute of Oceanography

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Title Carbohydrates, uronic acids and alkali extractable carbohydrates in contrasting marine and estuarine sediments: Distribution, size fractionation and partial chemical characterization
 
Creator Khodse, V.B.
Fernandes, L.
Bhosle, N.B.
Sardessai, S.
 
Subject monosaccharide
Arabian Sea
Mandovi estuary
Bay of Bengal
sediments
biomarkers
 
Description Concentration, size fractionation and monosaccharide composition of carbohydrates and uronic acids were investigated in contrasting sediments of the Mandovi estuary (ME), Arabian Sea (AS) and the Bay of Bengal (BOB). Concentrations and monosaccharide composition of carbohydrates and uronic acids varied spatially. Average yields of carbohydrates and uronic acids were higher for the estuarine compared to marine sediments. Interestingly, yields of carbohydrates and uronic acids increased in sediments with water column depth, implying preferential removal of other constituents, selective preservation and/or lateral input of carbohydrate rich material. Analysis of monosaccharide biomarkers indicates that carbohydrates were derived from terrestrial plants, bacteria and phytoplankton, however, the influence of the former was relatively greater in sediments of the ME and BOB, as well as in residual sediments of ME. Approximately 11-21% of total carbohydrates could be extracted using hot alkali extraction followed by sonication. Irrespective of the depositional environment, carbohydrates and uronic acids were greater in the very high molecular weight size fraction (is greater than 30 kDa). The abundance of glucose increased with the decrease in molecular size of extracted organic matter. This probably indicates its association with less degradable carbohydrates
 
Date 2008-04-01T07:27:20Z
2008-04-01T07:27:20Z
2008
 
Type Journal Article
 
Identifier Organic Geochemistry, vol.39; 265-283p.
no
http://drs.nio.org/drs/handle/2264/1047
 
Language en
 
Rights Copyright [2008] Elsevier
 
Publisher Elsevier