scholarly journals Validation and application of a chromatographic method for evaluation of commercial vegetable oils possibly adulterated

2018 ◽  
Vol 22 ◽  
pp. 13
Author(s):  
Katarynna Santos Araújo ◽  
Mariana Oliveira Barbosa ◽  
Carolina Barbosa Malafaia ◽  
Daniella Carla Napoleão
Keyword(s):  
Fatty Acids ◽  
Olive Oil ◽  
Vegetable Oils ◽  
Fatty Acid Methyl Esters ◽  
Unsaturated Fatty Acids ◽  
Methyl Esters ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Acid Methyl ◽  
Two Samples

A method of separation, identification and quantification of fatty acid methyl esters (FAMEs) was developed by gas chromatography with flame ionization detector (GC-FID) using a basic transesterification. In this sense, there were analyzed FAMEs in commercial samples of vegetable oils from soybean and olive oil. The referred method was linear (r>0.99), accurate and precise for palmitic (C16:0), linoleic (C18:2), oleic (C18:2), linolenic (C18:3) and stearic (C18:0) acids. The limits of detection (LOD) and quantification (LOQ) were from 0.03 to 0.31 and 0.08 to 0.94 mg.mL-1 for the five fatty acids, respectively. The results demonstrated that the unsaturated fatty acids were the most abundant for the two samples, being the oleic acid (C18:1) the major in three brands of olive oil (D, E and F), and the linoleic acid (C18:2) the most abundant in soybean oil and the other brands of olive oil (G, H and I), suggesting a possible adulteration in these brands. The proposed method could be considered a tool for the investigation of adulteration in commercial vegetable oils for guaranteed reliability in the results to be comparable with correlated legislations.

Recent advances in the field of selective epoxidation of vegetable oils and their derivatives: a review and perspective

2017 ◽  
Vol 7 (17) ◽  
pp. 3659-3675 ◽  
Author(s):  
S. M. Danov ◽  
O. A. Kazantsev ◽  
A. L. Esipovich ◽  
A. S. Belousov ◽  
A. E. Rogozhin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Vegetable Oils ◽  
Critical Review ◽  
Fatty Acid Methyl Esters ◽  
Recent Progress ◽  
Unsaturated Fatty Acids ◽  
Methyl Esters ◽  
Acid Methyl ◽  
Review Reports

The present critical review reports the recent progress of the last 15 years in the selective epoxidation of vegetable oils and their derivatives, in particular unsaturated fatty acids (UFAs) and fatty acid methyl esters (FAMEs).

Tutorial for the Characterization of Fatty Acid Methyl Esters by Gas Chromatography with Highly Polar Capillary Columns

2020 ◽  
Author(s):  
Pierluigi Delmonte ◽  
Andrea Milani ◽  
John K G Kramer
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Fatty Acid ◽  
Vegetable Oils ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Capillary Columns ◽  
Marine Oils ◽  
Optimal Separation ◽  
Acid Methyl

Abstract The fatty acid composition of fats and oils is commonly determined by gas chromatography after preparing fatty acid methyl esters (FAME). Capillary columns coated with polyethylene glycol emerged as the preferred separation tool for the quantification of the polyunsaturated fatty acids contained primarily in marine oils. However, their selectivity is inadequate for measuring the trans fatty acids (TFA) contained in refined vegetable oils, dairy fats, and marine oils. Highly polar 100% poly(biscyanopropyl siloxane) capillary columns provide the necessary selectivity, but small differences in the phase polarity caused by column age, conditioning, or manufacturing variations affect the reproducibility of their separations of these complex samples. In this study, a simple procedure is described to compensate for small variations in column selectivity by adjusting the elution temperature. The balance between the dipole-induced dipole interactions and dispersive interactions was determined by measuring selectivity factors [SF(i)] corresponding to the elution of an unsaturated FAME such as 18:3n-3 relative to two saturated FAME such as 20:0 and 22:0. Knowing the SF(i) provided by the installed capillary column at a given elution temperature, and the SF(i) of the target separation, we propose a simple calculation to determine the necessary elution temperature adjustment to achieve (or restore) the desired separation. After determining the SF(i) which provides the optimal separation of TFA, the novel methodology was applied to the separation of refined vegetable oils, butter fats, and marine oils.

Determination of cis,cis-Methylene Interrupted Polyunsaturated Fatty Acids in Fats and Oils By Capillary Gas Chromatography

1986 ◽  
Vol 69 (1) ◽  
pp. 65-67
Author(s):  
Albert K Athnasios ◽  
Edward J Healy ◽  
Anthony F Gross ◽  
Gareth J Templeman
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Fatty Acid Methyl Esters ◽  
Capillary Column ◽  
Methyl Esters ◽  
Fats And Oils ◽  
Pufa Content ◽  
Acid Methyl ◽  
Relative Standard

Abstract A capillary gas chromatographic (CGC) method is described for the determination of cis,cis-methylene interrupted polyunsaturated fatty acids (cis-PUFA) in fats and oils. The sample is saponified and the liberated fatty acids are esterified to the corresponding methyl esters. The latter are analyzed by CGC using a 60M SP2340 capillary column. Area percent values for 9,12-cis,cis-C18:2 and 9,12,15-cis,cis,cis-C18:3 fatty acid methyl esters are summed to give the total cis-PUFA content. Gas chromatographic results agreed well with those obtained by an enzymatic lipoxygenase method at the 31-48% cis-PUFA levels with a correlation coefficient of 0.98. The method has a precision (relative standard deviation) of 0.33% at a 44.4% cis-PUFA level in margarine oil.

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