Influence of soil moisture on concentrations and 13C NMR profiles of lipids in three Albeluvisols

Лодыгин, Е. Д.; Beznosikov, V. A.

doi:10.1016/j.geoderma.2004.12.004

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…Both spectra were dominated by both saturated and unsaturated aliphatic chains that are likely to be present in the form of acids, esters, and alcohols. These spectra are consistent with 13 C NMR spectra of soil lipids, mainly dominated by polymethylene C and lower levels of O-alkyl, aromatic, carbonyl, and carboxyl C functionalities (Almendros et al, 2001;Lodygin and Beznosikov, 2005).…”

Section: Results and Discussion Lipid Analysessupporting

confidence: 84%

The Role of Lipids on Sorption Characteristics of Freshwater‐ and Wastewater‐Irrigated Soils

et al. 2006

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The soil lipid fraction can play an important role in the sorption of organic compounds. In this study, the impact of the lipid fraction of freshwater-and wastewater-irrigated soils on the sorption of non-and relatively polar compounds was assessed. Lipid analyses revealed a clear difference between the two lipid fractions. The lipid extract from the wastewater-irrigated soil was consistent with mainly straight paraffinic chain materials; the lipid extract from freshwater-irrigated soil, on the other hand, exhibited stronger signals of aromatics, double bonds, ester, ether, and methyl, in addition to a smaller contribution from methylene protons. Our data suggest that lipid removal induced a stronger increase in the soil's sorption affinity for solutes capable of polar interactions such as atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) and chlorotoluron (N9-(3-chloro-4-methylphenyl)-N,N-dimethylurea) as compared to phenanthrene. Moreover, the level of increase in sorption affinities due to lipid removal was much higher for the freshwater-irrigated soil than for its wastewater-irrigated counterpart, even though the level of lipids in the freshwater-irrigated soil was half that in the wastewater-irrigated one (6 vs. 11% of the total organic C). The higher level of polar functionalities, such as ether and ester moieties, in the lipid fraction from the freshwater-irrigated soil suggests that these extractable compounds compete successfully with the polar solutes (atrazine and chlorotoluron) for specific binding sites in the soil organic matter (SOM). It appears that the composition of the lipid fraction may be a key consideration in unraveling the sorption of organic molecules in soils.

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Section: Results and Discussion Lipid Analysessupporting

confidence: 84%

The Role of Lipids on Sorption Characteristics of Freshwater‐ and Wastewater‐Irrigated Soils

et al. 2006

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“…Its 13 C NMR spectrum (Figure ) displayed a large alkyl resonance between 29 and 33 ppm that corresponded to polymethylene chains and weaker resonances in the carboxyl and aromatic carbon portions of the spectrum. This is characteristic of soil and sediment lipids. − …”

Section: Resultsmentioning

confidence: 98%

“…This is characteristic of soil and sediment lipids. [18][19][20] Comparisons of the total organic carbon content for the original samples and their corresponding mixtures were made for each step in the procedure as well as for the whole fractionation process. The data in Table 2 show that HA 0 had the same carbon content as the mixtures HA 0 /3 and HA 0 /2, and fraction L 0 had the same carbon content as mixture L 0 /2.…”

Section: Resultsmentioning

confidence: 99%

Structural Organization of Humic Acid in the Solid State

Chilom

Rice

2009

Langmuir

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Studies of the structural organization of humic acid in solution have suggested that it is composed of three fractions, two humic acid-like and one lipid-like, that have distinct roles in the process of its self-organization. The present work extends the study of humic acid's structural organization to the solid state by directly comparing its organization with a physical mixture composed of its three fractions using differential scanning calorimetry. Comparative measurements of the specific heat capacity as a function of temperature reveal differences between the original humic acid and the mixture with the same chemical composition. These differences provide direct evidence that humic acid's solid state structure is more than just a mixture of components and is determined by specific interactions between its components. This study indicates that humic acid in the solid state has a hierarchical or "structure within a structure" architecture. The lower-level structure is determined by the self-assembly of amphiphilic components of humic acid with lipids into a nanostructured composite material. A higher-level structure is formed by the association of this composite material with the nonamphiphilic components of humic acid.

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“…All 13 C NMR spectra have one relatively sharp peak in the 30 ppm region, which can be related to methylene atoms of carbon in positions α, β, δ, and ε from methyl end-groups (15 ppm) in alkyl chains (Simpson and Simpson 2009). These methylene carbon atoms, as suggested by some researchers, may result from accumulation of wax resins, lipids, and suberin plant structures (Lodygin and Beznosikov 2005;Alarcón-Gutiérrezet et al 2009;Vasilevich et al 2018). All spectra also show a signal in the range of 47-60 ppm, which some authors relate to methoxyl groups resulting from the presence of lignin fragments, i.e.…”

Section: Resultsmentioning

confidence: 95%

Polish Polar Research

Lodygin,

Vasilevich

2020

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Data on the molecular structure of humic substances (HSs) of zonal soils for the southern, middle, northern taiga and southern tundra of northeastern European Russia have been obtained. This was accomplished using solid-state 13 C nuclear magnetic resonance ( 13 C NMR) technique. The soils under study vary in the point of genesis and degree of hydromorphism. The impact of environmental factors (temperature and humidity) on qualitative and quantitative composition of humic (HAs) and fulvic acids (FAs) has been determined. Excess moisture significantly affects HS accumulation and HS molecular structure: hydromorphic taiga soils accumulate HSs enriched by unoxidized aliphatic fragments, tundra soils -the ones enriched by carbohydrate fragments. Various conditions of soil genesis predefine the specific character of structural and functional parameters of HSs in the southern taiga to southern tundra soils, as is expressed through the increased portion of labile carbohydrate and amino acid fragments and methoxyl groups within the structure of HSs. The tundra humification is characterized by levelling-off of structural and functional parameters of major classes of specific organic compounds of soils -HAs and FAs.

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Influence of soil moisture on concentrations and 13C NMR profiles of lipids in three Albeluvisols

Cited by 14 publications

References 22 publications

The Role of Lipids on Sorption Characteristics of Freshwater‐ and Wastewater‐Irrigated Soils

The Role of Lipids on Sorption Characteristics of Freshwater‐ and Wastewater‐Irrigated Soils

Structural Organization of Humic Acid in the Solid State

Polish Polar Research

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