High-performance liquid chromatography with nuclear magnetic resonance detection--A method for quantification of alpha- and gamma-linolenic acids in their mixtures with free fatty acids.
While many naturally occurring mixtures of free fatty acids are conveniently analyzed by hyphenated technique of LC-NMR, a complete separation of alpha- and gamma-linolenic acids for their quantitative determination appears impossible at least by the methods of reversed phase HPLC. However, they can be differentiated and quantified from 1H NMR spectra measured in the course of isocratic acetonitrile-chloroform (90:10, with C8 and C18 columns in series) LC-NMR analysis without the need for any derivatization.
Sýkora
Jan
J
Institute of Chemical Process Fundamentals, Academy of Sciences, Rozvojová 135, 165 02 Prague 6, Czech Republic.
Bernásek
Prokop
P
Zarevúcká
Marie
M
Kurfürst
Milan
M
Sovová
Helena
H
Schraml
Jan
J
D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005230:Fatty Acids, Nonesterified / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D010938:Plant Oils / Q000737:chemistry; D031965:Ribes / Q000737:chemistry; D012639:Seeds / Q000737:chemistry; D017962:alpha-Linolenic Acid / Q000032:analysis*; D017965:gamma-Linolenic Acid / Q000032:analysis*
D005230:Fatty Acids, Nonesterified; D010938:Plant Oils; D017962:alpha-Linolenic Acid; D017965:gamma-Linolenic Acid