Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 58, Issue 13, Pages 7489-7496Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf100550b
Keywords
Capillary electrophoresis; stacking; trigonelline; soy; sunflower; vegetable oils; olive oils
Funding
- Ministry of Science and Innovation [CTQ2009-09022]
- Comunidad Autonoma of Madrid (Spain) [S2009/AGR-1464]
- University of Alcala and the Comunidad Autonoma of Madrid [CCG08-UAH/AGR-3678]
- Comunidad Autonoma of Madrid
- University of Alcala
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A capillary electrophoresis method with UV detection was developed for the first time for the determination of the pyridine betaine trigonelline (N-methylnicotinic acid) in seeds and vegetable oils. Analytical characteristics of the method showed its good performance in terms of linearity (r > 0.999), precision (relative standard deviations < 5%), and limits of detection (up to 0.9 mu M or 1 ng/g for oils). The developed method was applied to the analysis of soy and sunflower seeds, three varieties of olives, and sunflower, soy, and extra virgin olive oils. Trigonelline was determined in soy and sunflower seeds and their respective oils, whereas it was not detected in olives or olive oils. Different mixtures of extra virgin olive oil with seed oils were analyzed, detecting up to 10% of soy oil in olive oil. As a consequence, trigonelline is proposed in this work as a novel marker for the detection of adulterations of olive oils with other vegetable oils such as soy and sunflower oils.
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