Quantitative thin-layer chromatography of sedimentary organic matter

Huc, A.; Roucache, Janine G.

doi:10.1021/ac00229a044

Cited by 12 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analytical procedure was described by Huc and Rouchache. 9 The solids remaining on the filter were collected; the mineral part was destroyed by acid attack for the tests performed in the presence of a solid matrix. IO The remaining pyrobitumen was then submitted to elemental analysis with direct determination of the oxygen content, as proposed by Durand and Monin.…”

Section: Methodsmentioning

confidence: 99%

Thermal Cracking of Heavy-Oil/ Mineral Matrix Systems

Monin

Audibert

1988

SPE Reservoir Engineering

View full text Add to dashboard Cite

At temperatures and pressures encountered during thermal recovery, chemical reactions involving oil, possibly water, and mineral matrix may lead to significant changes in composition of the phases. This work focuses on thermal alteration of four crude oils with different geochemical compositions. The tests were performed in an autoclave at 350°C [660°F] for 200 hours. The oil was in the presence of water and a mineral matrix representative of reservoir rocks.The formation of significant amounts of insoluble organic material was observed in all tests. Gaseous hydrocarbons (mainly methane) formed by pyrolysis. COz evolution depended on oil and matrix compositions; moreover, water was found to be a reactant in the formation of oxygen-containing components.For crude oils investigated, the oil phase was significantly enriched in lighter hydrocarbons (mainly in saturates). However, aromatic content was less affected by the thermal treatment. On the other hand, asphaltenes and, to a lesser extent, resins were the main precursors of insoluble material. These results provide new insight on mechanisms of the cracking reactions involved in thermal recovery processes.

show abstract

Section: Methodsmentioning

confidence: 99%

Thermal Cracking of Heavy-Oil/ Mineral Matrix Systems

Monin

Audibert

1988

SPE Reservoir Engineering

View full text Add to dashboard Cite

show abstract

“…[27,28] In addition, lipids were unspecifically detected by using Rhodamine B, [29] Rhodamine 6G, [23] 2',7'-dichlorofluorescein, [29][30][31] 8-anilinonaphthalene-1-sulfonic acid [30] and Nile red. [32] This last revealing agent was considered a stable fluorophore that emits in a hydrophobic environment.…”

mentioning

confidence: 99%

Changes in Fluorescent Emission Due to Non‐covalent Interactions as a General Detection Procedure for Thin‐Layer Chromatography

et al. 2011

View full text Add to dashboard Cite

Changes in fluorescence emission due to non-covalent analyte-fluorophore interactions in silica gel plates are studied and used as a general detection procedure for thin-layer chromatography (TLC). The presence of the analyte modifies the microenvironment of the fluorophore and thus changes the balance between radiative (k(r)) and non-radiative (k(nr)) emission constants. A model is proposed for analyte-fluorophore induced electrostatic interactions, which depend on analyte polarizability and are responsible for fluorescence enhancements. As consequence of these induced interactions, the analyte creates an apolar environment that prevents non-fluorescent decay mechanisms, decreasing k(nr). On the other hand, the effect of an increase in refractive index on k(r) is investigated, as it contributes to some extent to fluorescence enhancements in silica gel medium. Changes in fluorescence emission should be regarded as a general property of fluorophores in the presence of analytes, and criteria that fluorophores should meet to be used as sensitive TLC probes are discussed here.

show abstract

“…As an alternative to the use of saturated compounds as detection reagents, the phenomenon of fluorescence enhancement has also been used for the detection of alkanes, using berberine salts as a reagent. − TLC plates can either be sprayed or dipped after development or impregnated before development since berberine salts are not eluted by most of the usual solvents in TLC.…”

mentioning

confidence: 99%

“…11 As an alternative to the use of saturated compounds as detection reagents, the phenomenon of fluorescence enhancement has also been used for the detection of alkanes, using berberine salts as a reagent. [12][13][14] It has been reported that the observed luminiscence enhancement depends, in general, on a number of factors, of which the most important are the sample studied, the characteristics of the sorbent layer, the enhancement reagent used and its concentration, and the time between impregnating the plate with reagent and making measurements. The possibility of interactions between sorbent and sorbate or between sorbent and the enhancing reagent has been mentioned.…”

mentioning

confidence: 99%

Enhancement of Fluorescence in Thin-Layer Chromatography Induced by the Interaction between n-Alkanes and an Organic Cation

Cossío¹,

Arrieta²,

Cebolla³

et al. 2000

Anal. Chem.

View full text Add to dashboard Cite

Fluorescence enhancement of a broad variety of solutes has been used extensively in TLC although no thorough explanation has been proposed. In this work, we try to understand it and explore new applications to which it can be put. In this way, alkanes can be quantitatively determined by fluorescence scanning densitometry using silica gel plates impregnated with berberine sulfate. Molecular simulation and analysis of molecular orbitals allows this phenomenon to be explained in this case and lays the groundwork to explain fluorescence enhancements produced by other molecules. A ion-molecule interaction between alkanes and berberine sulfate is responsible for the enhancement of fluorescence produced by alkanes. Computational results suggest that the surrounding alkane molecules provide an apolar environment to the berberine cation, thus enhancing the intensity of the fluorescence signal. This proposed explanation has been tested by extending the fluorescence determination to other compounds. These include biologically interesting saturated and unsaturated fatty acids, steroids and derivatives, prostaglandins, ceramides, galactocerebrosides, as well as terpenes, and polypropylene glycols. In addition, according to the proposed explanation, the properties required for alternative impregnants to berberine are discussed.

show abstract

Quantitative thin-layer chromatography of sedimentary organic matter

Cited by 12 publications

References 12 publications

Thermal Cracking of Heavy-Oil/ Mineral Matrix Systems

Thermal Cracking of Heavy-Oil/ Mineral Matrix Systems

Changes in Fluorescent Emission Due to Non‐covalent Interactions as a General Detection Procedure for Thin‐Layer Chromatography

Enhancement of Fluorescence in Thin-Layer Chromatography Induced by the Interaction between n-Alkanes and an Organic Cation

Contact Info

Product

Resources

About