Hydrocarbon type analysis by thin-layer chromatography with flame-ionization detection: vacuum gas oils, heavy feeds, and hydroprocessed products

2004 ◽  
Vol 27 (4) ◽  
pp. 311-315 ◽  
Author(s):  
Bhajendra N. Barman
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Flame Ionization Detection ◽  
Type Analysis ◽  
Ionization Detection ◽  
Flame Ionization ◽  
Layer Chromatography

scholarly journals Application of Thin-Layer Chromatography-Flame Ionization Detection (TLC-FID) to Total Lipid Quantitation in Mycolic-Acid Synthesizing Rhodococcus and Williamsia Species

2020 ◽  
Vol 21 (5) ◽  
pp. 1670
Author(s):  
Akhikun Nahar ◽  
Anthony L. Baker ◽  
David S. Nichols ◽  
John P. Bowman ◽  
Margaret L. Britz
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Polar Lipid ◽  
Lipid Classes ◽  
Detection Methods ◽  
Resonance Spectroscopy ◽  
Flame Ionization Detection ◽  
Ionization Detection ◽  
Flame Ionization ◽  
Layer Chromatography

In addition to cell membrane phospholipids, Actinobacteria in the order Corynebacteriales possess a waxy cell envelope containing mycolic acids (MA). In optimized culture condition, some species can also accumulate high concentrations of intracellular triacylglycerols (TAG), which are a potential source of biodiesel. Bacterial lipid classes and composition alter in response to environmental stresses, including nutrient availability, thus understanding carbon flow into different lipid classes is important when optimizing TAG synthesis. Quantitative and qualitative analysis of lipid classes normally requires combinations of different extraction, derivatization, chromatographic and detection methods. In this study, a single-step thin-layer chromatography-flame ionization detection (TLC-FID) technique was applied to quantify lipid classes in six sub-Antarctic Corynebacteriales strains identified as Rhodococcus and Williamsia species. A hexane:diethyl-ether:acetic acid solvent system separated the total cellular lipids extracted from cells lysed by bead beating, which released more bound and unbound MA than sonication. Typical profiles included a major broad non-polar lipid peak, TAG and phospholipids, although trehalose dimycolates, when present, co-eluted with phospholipids. Ultra-performance liquid chromatography-tandem mass-spectrometry and nuclear magnetic resonance spectroscopy detected MA signatures in the non-polar lipid peak and indicated that these lipids were likely bound, at least in part, to sugars from cell wall arabinogalactan. Waxy esters were not detected. The single-solvent TLC-FID procedure provides a useful platform for the quantitation and preliminary screening of cellular lipid classes when testing the impacts of growth conditions on TAG synthesis.

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