High molecular weight aromatic nitrogen and other novel hopanoid-related compounds in crude oils

2004 ◽  
Vol 35 (6) ◽  
pp. 665-678 ◽  
Author(s):  
T.B.P Oldenburg ◽  
H Huang ◽  
P Donohoe ◽  
H Willsch ◽  
S.R Larter
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Related Compounds

Distribution of high-molecular-weight n-alkanes in paraffinic crude oils and asphaltene-resin-paraffin deposits

2010 ◽  
Vol 50 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Yu. M. Ganeeva ◽  
T. R. Foss ◽  
T. N. Yusupova ◽  
A. G. Romanov
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Paraffinic Crude

scholarly journals Production and characterisation of a marine Halomonas surface-active exopolymer

2019 ◽  
Vol 104 (3) ◽  
pp. 1063-1076
Author(s):  
Tony Gutierrez ◽  
Gordon Morris ◽  
Dave Ellis ◽  
Barbara Mulloy ◽  
Michael D. Aitken
Keyword(s):  
Molecular Weight ◽  
Ionic Strength ◽  
High Molecular Weight ◽  
Positive Influence ◽  
Contaminated Sites ◽  
Crude Oils ◽  
Magnetic Resonance Spectroscopic Analysis ◽  
Surface Active ◽  
Low Ionic Strength ◽  
Pure Hydrocarbon

AbstractDuring screening for novel emulsifiers and surfactants, a marine gammaproteobacterium, Halomonas sp. MCTG39a, was isolated and selected for its production of an extracellular emulsifying agent, P39a. This polymer was produced by the new isolate during growth in a modified Zobell’s 2216 medium amended with 1% glucose, and was extractable by cold ethanol precipitation. Chemical, chromatographic and nuclear magnetic resonance spectroscopic analysis confirmed P39a to be a high-molecular-weight (~ 261,000 g/mol) glycoprotein composed of carbohydrate (17.2%) and protein (36.4%). The polymer exhibited high emulsifying activities against a range of oil substrates that included straight-chain aliphatics, mono- and alkyl- aromatics and cycloparaffins. In general, higher emulsification values were measured under low (0.1 M PBS) compared to high (synthetic seawater) ionic strength conditions, indicating that low ionic strength is more favourable for emulsification by the P39a polymer. However, as observed with other bacterial emulsifying agents, the polymer emulsified some aromatic hydrocarbon species, as well as refined and crude oils, more effectively under high ionic strength conditions, which we posit could be due to steric adsorption to these substrates as may be conferred by the protein fraction of the polymer. Furthermore, the polymer effected a positive influence on the degradation of phenanthrene by other marine bacteria, such as the specialist PAH-degrader Polycyclovorans algicola. Collectively, based on the ability of this Halomonas high-molecular-weight glycoprotein to emulsify a range of pure hydrocarbon species, as well as refined and crude oils, it shows promise for the bioremediation of contaminated sites.

Speciation and quantification of high molecular weight paraffins in Brazilian whole crude oils using high-temperature comprehensive two-dimensional gas chromatography

Fuel ◽  
2018 ◽  
Vol 234 ◽  
pp. 1154-1164 ◽  
Author(s):  
Daniela França ◽  
Vinícius B. Pereira ◽  
Dayane M. Coutinho ◽  
Luca M. Ainstein ◽  
Débora A. Azevedo
Keyword(s):  
Molecular Weight ◽  
Gas Chromatography ◽  
High Temperature ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Two Dimensional

scholarly journals Synthetic High Molecular Weight Enzyme Inhibitors. I. Polymeric Phosphates of Phloretin and Related Compounds.

1953 ◽  
Vol 7 ◽  
pp. 913-920 ◽  
Author(s):  
E. Diczfalusy ◽  
O. Fernö ◽  
H. Fex ◽  
B. Högberg ◽  
T. Linderot ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Enzyme Inhibitors ◽  
Related Compounds

Geochemistry of High-Molecular Weight Dimethylalkanes

2021 ◽  
Vol 62 (08) ◽  
pp. 866-877
Author(s):  
V.A. Kashirtsev ◽  
O.S. Dzyuba ◽  
B.L. Nikitenko ◽  
E.A. Kostyreva ◽  
I.K. Ivanova ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Molecular Weight ◽  
Organic Matter ◽  
High Molecular Weight ◽  
Homologous Series ◽  
Russian Platform ◽  
Microbial Origin ◽  
Carbon Chains ◽  
Chromatography Mass Spectrometry ◽  
Related Compounds

Abstract —The homologous series of high-molecular weight dimethylalkanes (HMWDMAs) with either odd- or even-numbered carbon chains in the range from C19–20 to C30–31 have been identified in organic matter from recent and partially lithified deposits of Siberia and the Russian Platform by chromatography–mass spectrometry. The first homologous series is represented by even-numbered 3,4-HMWDMAs followed by the alternation of odd-numbered 3,5-HMWDMAs, even-numbered 3,6-HMWDMAs, and odd-numbered 3,7-HMWDMAs. The most abundant are 3,7-dimethylalkanes. The microbial origin of high-molecular weight dimethylalkanes is the most likely explanation for their presence in the fossil organic matter. The precursors of HMWDMAs might have been tetra- and diether lipids of archaea and bacteria. It is assumed that HMWDMAs and other immature hydrocarbons from great depths (SV-27 and SG-6 superdeep boreholes) result from the decomposition of asphaltenes, which occluded the related compounds inside their structure during the early stages of generation and carried them unchanged throughout the “oil window”.

scholarly journals Characterization of high molecular weight biomarkers in crude oils

2000 ◽  
Vol 31 (12) ◽  
pp. 1581-1588 ◽  
Author(s):  
Michael Hsieh ◽  
R.Paul Philp ◽  
J.C del Rio
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils
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