Detection of adulteration of poppy seed oil with sunflower oil based on volatiles and triacylglycerol composition.
Although poppy seed oil is an expensive article of trade, no literature about identification methods for adulteration with cheaper vegetable oils, like sunflower oil, has been published. This kind of adulteration is a challenge for routine analytical methods, such as the determination of fatty acid composition, because of almost similar fatty acid ratios. The detection of adulteration of poppy seed oils with sunflower oils at different levels (5-40%, w/w) by using SPME-GC-MS and MALDI-ToF-MS is the subject of our investigation. With the mentioned SPME-GC-MS method, it was possible to detect an admixture of sunflower oils in all relevant (5-40%) amounts by using alpha-pinene as a marker compound. Admixture of sunflower oil with high levels of triolein (high-oleic acid type) could be undoubtedly detected by MALDI-MS down to the 5-10% level. In contrast, adulteration of pure poppy seed oil by "standard" sunflower oils remained indistinguishable using this MALDI-MS.
Krist
Sabine
S
Department of Clinical Pharmacy and Diagnostics, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. sabine.krist@univie.ac.at
Stuebiger
Gerald
G
Bail
Stefanie
S
Unterweger
Heidrun
H
D000081008:Bicyclic Monoterpenes; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D039821:Monoterpenes / Q000032:analysis; D010207:Papaver / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D000074242:Sunflower Oil; D014280:Triglycerides / Q000032:analysis*; D014835:Volatilization
D000081008:Bicyclic Monoterpenes; D039821:Monoterpenes; D010938:Plant Oils; D000074242:Sunflower Oil; D014280:Triglycerides; C005451:alpha-pinene