Trans fatty acid composition and tocopherol content in vegetable oils produced in Mexico

L. A. Medina-Juárez*, N. Gámez-Meza, J. Ortega-Garcí, J. A. Noriega-Rodriguez, O. Angulo-Guerrero

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


The purpose of this study was to evaluate the trans fatty acid (TFA) composition and the tocopherol content in vegetable oils produced in Mexico. Sample oils were obtained from 18 different oil refining factories, which represent 72% of the total refineries in Mexico. Fatty acids and TFA isomers were determined by gas chromatography using a 100-m fused-silica capillary column (SP-2560). Tocopherol content was quantified by normal-phase high-performance liquid chromatography using an ultraviolet detector and a LiChrosorb Si60 column (25 cm). Results showed that 83% of the samples corresponded to soybean oil. Seventy-two percent of the oils analyzed showed TFA content higher than 1%. Upon comparing the tocopherol contents in some crude oils to their corresponding deodorized samples, a loss of 40-56% was found. The processing conditions should be carefully evaluated in order to reduce the loss of tocopherols and the formation of TFA during refining.

Original languageEnglish
Pages (from-to)721-724
Number of pages4
JournalJAOCS, Journal of the American Oil Chemists' Society
Issue number7
StatePublished - 2000

Bibliographical note

Funding Information:
We express our sincere appreciation to the Consejo Nacional de Ciencia y Tecnología (CONACYT), the American Soybean Association of Mexico, and the Refining Oil Industry of Mexico for the support and encouragement for this work.


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