High-performance liquid chromatography with light-scattering detection and desorption chemical-ionization tandem mass spectrometry of milk fat triacylglycerols |
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Authors: | George A Spanos Steven J Schwartz Richard B van Breemen Chien-Hua Huang |
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Affiliation: | (1) Southeast Dairy Foods Research Center, Department of Food Science, North Carolina State University, Box 7624, 276957624 Raleigh, NC;(2) Department of Chemistry, North Carolina Sate University, 27695 Raleigh, North Carolina;(3) Present address: Applied Analytical Industries, 1206 North 23rd St., 28405 Wilmington, NC;(4) Present address: Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, 833 South Wood St., 606127231 Chicago, IL |
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Abstract: | The utility of reverse-phase high-performance liquid chromatography (HPLC), desorption chemical-ionization mass spectrometry
(DCI-MS) and tandem mass spectrometry (MS/MS) for the characterization of triacylglycerols in complex mixtures has been further
explored. Triacylglycerols of anhydrous bovine milk fat were separated by using two reversephase C18 HPLC columns, and eluents were monitored with an evaporative light-scattering detector. Fifty-eight fractions were resolved
and analyzed by positive ion isobutane DCI-MS. The formation of protonated molecules and of major fragments corresponding
to the random loss of any one of the constituent fatty acids readily identified acyl carbon numbers and the number of double
bonds within each fatty acid. MS/MS was only required when the original mass spectra indicated the presence of more than one
triacylglycerol or of impurities in a fraction. Protonated molecules produced by DCI were fragmented using high energy collisional
activation, and the resulting ions were detected by MS/MS. Odd-chain triacylglycerols were also readily distinguished using
this methodology. The positive ion DCI and MS/MS techniques described here demonstrate the usefulness of this approach for
the characterization of triacylglycerols in complex mixtures. |
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