Two-point normalization using internal and external standards for a traceable determination of δ13C values of fatty acid methyl esters by gas chromatography/combustion/isotope ratio mass spectrometry

2017 ◽  
Vol 418 ◽  
pp. 41-50 ◽  
Author(s):  
Maíra Fasciotti ◽  
Thays V.C. Monteiro ◽  
Alexandre A. Ferreira ◽  
Marcos N. Eberlin ◽  
Laura A. Neves
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Fatty Acid ◽  
Isotope Ratio ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Isotope Ratio Mass Spectrometry ◽  
Δ13c Values ◽  
Acid Methyl

Direct ultrasound-assisted methylation of fatty acids in serum for free fatty acid determinations

2010 ◽  
Vol 88 (9) ◽  
pp. 898-905 ◽  
Author(s):  
Liyan Liu ◽  
Ying Li ◽  
Rennan Feng ◽  
Changhao Sun
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Gas Chromatography ◽  
Fatty Acid ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Ultrasonic Waves ◽  
Acid Methyl ◽  
Ultrasound Assisted

A method for simultaneous determination of 16 free fatty acids (FFAs) in serum is described. The method involves conversion of FFAs to fatty acid methyl esters (FAMEs) using the heat of ultrasonic waves followed by gas chromatography and mass spectrometry (GC–MS) analysis. Optimum levels of the variables affecting the yield of FAMEs were investigated. The results indicate that the optimal levels are 55 °C, 60 W, 10% H2SO4/CH3OH, and 50 min. Recoveries ranged from 85.32% to 112.11%, with a detection limit ranging from 0.03 to 0.08 μg mL–1. The linearity, using the linear correlation coefficient, was higher than 0.9914.

On the determination of the distillation curve of fatty acid methyl esters by gas chromatography

Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123143
Author(s):  
Rodica Niculescu ◽  
Mihaela Năstase ◽  
Adrian Clenci
Keyword(s):  
Gas Chromatography ◽  
Fatty Acid ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Distillation Curve ◽  
Acid Methyl
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