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Quantitative analysis of triacylglycerol regioisomers in fats and oils using reversed‐phase high‐performance liquid chromatography and atmospheric pressure chemical ionization mass spectrometry
Author(s) -
Fauconnot Laëtitia,
Hau Jörg,
Aeschlimann JeanMarc,
Fay LaurentBernard,
Dionisi Fabiola
Publication year - 2003
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1317
Subject(s) - chemistry , structural isomer , chromatography , mass spectrometry , atmospheric pressure chemical ionization , repeatability , analytical chemistry (journal) , high performance liquid chromatography , fatty acid , vegetable oil , chemical ionization , ionization , organic chemistry , ion
Positional distribution of fatty acyl chains of triacylglycerols (TGs) in vegetable oils and fats (palm oil, cocoa butter) and animal fats (beef, pork and chicken fats) was examined by reversed‐phase high‐performance liquid chromatography (RP‐HPLC) coupled to atmospheric pressure chemical ionization using a quadrupole mass spectrometer. Quantification of regioisomers was achieved for TGs containing two different fatty acyl chains (palmitic (P), stearic (S), oleic (O), and/or linoleic (L)). For seven pairs of ‘AAB/ABA’‐type TGs, namely PPS/PSP, PPO/POP, SSO/SOS, POO/OPO, SOO/OSO, PPL/PLP and LLS/LSL, calibration curves were established on the basis of the difference in relative abundances of the fragment ions produced by preferred losses of the fatty acid from the 1/3‐position compared to the 2‐position. In practice the positional isomers AAB and ABA yield mass spectra showing a significant difference in relative abundance ratios of the ions AA + to AB + . Statistical analysis of the validation data obtained from analysis of TG standards and spiked oils showed that, under repeatability conditions, least‐squares regression can be used to establish calibration curves for all pairs. The regression models show linear behavior that allow the determination of the proportion of each regioisomer in an AAB/ABA pair, within a working range from 10 to 1000 μg/mL and a 95% confidence interval of ±3% for three replicates. Copyright © 2003 John Wiley & Sons, Ltd.