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

Khodse, Vishwas B.; Fernandes, Lina L.; Bhosle, N.B.; Sardessai, S.

doi:10.1016/j.orggeochem.2008.01.003

Cited by 30 publications

(27 citation statements)

References 65 publications

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“…In order to verify the reliability of our data, we compared our results with those reported in literature for the marine and estuarine sediments. Monosaccharide composition and ratios in peloids were similar to -19 -the reported data (Khodse et al, 2008); that is, monosaccharides may have been derived from a mixture of phytoplankton, marine bacteria and terrestrial plants.…”

Section: Discussionsupporting

confidence: 81%

Characterization and Organic Compounds in Peloids from Mongolia

Dolmaa¹,

Tserenpil²,

Ugtakhbayar³

et al. 2011

Proc. Mong. Acad. Sci.

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The peloids are the important natural remedy all over the world. The physicochemical properties and some organic matters of peloids from 12 lakes in Mongolia were examined. These peloids belong to the continental hydrosulfi de sticky peloid except Gurvan nuur peloid. Peloid from Lake Gurvan nuur was classifi ed as a sapropel with high ash content.The peloid organic matters were investigated using chemical analysis and several analytical techniques, such as IR, and 13 C NMR spectroscopy, GC/MS, gas chromatography. The concentration of total organic carbon in all continental hydrosulfi de sticky peloids is ranged from 0.4% to 3.1%, but 15.3% in the sapropel. It shows that the majority of the peloids in Mongolia are hydrosulfi de sticky peloid with lower organic matters than the sapropel and peat. In this study, no signifi cant difference of chemical composition was observed between dissoluble and insoluble organic matters from peloids. Some classes of biomolecules, including lipid and carbohydrate, were identifi ed. Biogenic stimulator humic acid (HA) is the major part of the peloid organic matter. HA concentration varied between 11.2% and 55.9% of total organic matter of peloids. The macromolecule of the sapropel HA exhibited a lower aromatization degree and more functional groups than other HAs, as revealed by the 13 C NMR data and C/H ratio. The genesis of peloid organic matter is discussed in this paper.Our results suggest that the presence of known bioactive organic compounds, such as humic acid, lipid, and carbohydrate, as well as hydrogen sulfi de causes the balneological value of peloids in Mongolia.

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Section: Discussionsupporting

confidence: 81%

Characterization and Organic Compounds in Peloids from Mongolia

Dolmaa¹,

Tserenpil²,

Ugtakhbayar³

et al. 2011

Proc. Mong. Acad. Sci.

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“…The contribution of TNS to TCHO varied substantially, ranging 18-80%. High variability of TNS/TCHO (18-47%) was also reported elsewhere in the Mandovi Estuary sediment with more than half of the bulk carbohydrates were not neutral aldoses (Khodse et al, 2008). A probable reason which may explain this difference between TNS and TCHO is that carbohydrates determined by the PSA method include neutral monosaccharides and their methyl derivatives including uronic acids (Dubois et al, 1956).…”

Section: Carbohydrate Composition Of the Sedimentsmentioning

confidence: 60%

“…A probable reason which may explain this difference between TNS and TCHO is that carbohydrates determined by the PSA method include neutral monosaccharides and their methyl derivatives including uronic acids (Dubois et al, 1956). Moreover, the differences may also be due to structural changes of individual aldoses incorporated into refractory DOC molecules that can still be characterized by the PSA method but not by the GC method (Khodse et al, 2008). The neutral sugar composition of the Pearl River Estuary and SCS shelf showed a high spatial variation (Fig.…”

Section: Carbohydrate Composition Of the Sedimentsmentioning

confidence: 99%

“…This results in the accumulation of relatively inert structural carbohydrates in marine sediments (Burdige et al, 2000;Hernes et al, 1996;Jensen et al, 2005). The monosaccharide composition of carbohydrates in sediment is a useful tool for identifying the sources of carbohydrates (Campiano and Romano, 1998;Cowie and Hedges, 1984a;Ittekkot et al, 1984;Kerherve et al, 2002;Khodse et al, 2008). Based on the δ 13 C and C/N ratio, we estimated the contribution of terrigenous organic carbon to sediment TOC in the Pearl River Estuary and the adjacent SCS shelf as summarized in Table 3.…”

Section: Source Characterization Of Carbohydrates In the Pearl River mentioning

confidence: 99%

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Sources and accumulation of organic carbon in the Pearl River Estuary surface sediment as indicated by elemental, stable carbon isotopic, and carbohydrate compositions

Dai

Huang

et al. 2010

Biogeosciences

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Abstract. Organic matter in surface sediments from the upper reach of the Pearl River Estuary and Lingdingyang Bay, as well as the adjacent northern South China Sea shelf was characterized using a variety of techniques, including elemental (C and N) ratio, bulk stable organic carbon isotopic composition (δ 13 C), and carbohydrate composition analyses. Total organic carbon (TOC) content was 1.21 ± 0.45% in the upper reach, down to 1.00±0.22% in Lingdingyang Bay and to 0.80 ± 0.10% on the inner shelf and 0.58 ± 0.06% on the outer shelf. δ 13 C values ranged from −25.1‰ to −21.3‰ in Lingdingyang Bay and the South China Sea shelf, with a trend of enrichment seawards. The spatial trend in C/N ratios mirrored that of δ 13 C, with a substantial decrease in C/N ratio offshore. Total carbohydrate yields ranged from 22.1 to 26.7 mg (100 mg OC) −1 , and typically followed TOC concentrations in the estuarine and shelf sediments. Total neutral sugars, as detected by the nine major monosaccharides (lyxose, rhamnose, ribose, arabinose, fucose, xylose, galactose, mannose, and glucose), were between 4.0 and 18.6 mg (100 mg OC) −1 in the same sediments, suggesting that significant amounts of carbohydrates were not neutral aldoses. Using a two end-member mixing model based on δ 13 C values and C/N ratios, we estimated that the terrestrial organic carbon contribution to the surface sediment TOC was ca. 78±11% for Lingdingyang Bay, 34±4% for the inner shelf, and 5.5 ± 1% for the outer shelf. The molecular composition of the carbohydrate in the surface sediments also suggested that the inner estuary was rich in terrestrially derived carbohydrates but that their contribution decreased offshore. A relatively high abundance of deoxyhexoses in the estuary and Correspondence to: M. Dai (mdai@xmu.edu.cn) shelf indicated a considerable bacterial source of these carbohydrates, implying that sediment organic matter had undergone extensive degradation and/or transformation during transport. Sediment budget based on calculated regional accumulation rates showed that only ∼50% of the influxes of terrestrial organic carbon were accumulated in the estuary. This relatively low accumulation efficiency of terrestrial organic matter as compared to the total suspended solids (accumulation efficiency ∼73%) suggested significant degradation of the terrestrial organic carbon within the estuarine system after its discharge from the river. This study demonstrated that the combination of the bulk organic matter properties together with the isotopic composition and molecular-level carbohydrate compositions can be an efficient way to track down the source and fate of organic matter in highly dynamic estuarine and coastal systems. The predominance of terrestrially originated organic matter in the sediment and its generally low accumulation efficiency within the estuary is not surprising, and yet it may have important implications in light of the heavy anthropogenic discharges into the Pearl River Estuary during the past thirty years.

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“…Although the excretion of photosynthetic compounds is recognised as the major source of carbohydrates in seawater [10], so far there are not many papers reporting on the molecular composition of carbohydrates in the exudates from diatom cultures [see for examples [6][7]10,[22][23][24][25][26][27][28]. The molecular-level characterization of dissolved polysaccharides may provide basic information on the origin, the bioreactivity and the fate of these biopolymers.…”

Section: Gas-chromatography Of Alditol Acetates Of Neutral Monosacchamentioning

confidence: 99%

Diatom Polysaccharides: Extracellular Production, Isolation and Molecular Characterization

Urbani¹,

Sist²,

Pletikapić³

et al. 2012

The Complex World of Polysaccharides

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

Cited by 30 publications

References 65 publications

Characterization and Organic Compounds in Peloids from Mongolia

Characterization and Organic Compounds in Peloids from Mongolia

Sources and accumulation of organic carbon in the Pearl River Estuary surface sediment as indicated by elemental, stable carbon isotopic, and carbohydrate compositions

Diatom Polysaccharides: Extracellular Production, Isolation and Molecular Characterization

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