title: Quantitation of triacylglycerols in edible oils by off-line comprehensive two-dimensional liquid chromatography-atmospheric pressure chemical ionization mass spectrometry using a single column.
abstract: In this investigation, off-line comprehensive two-dimensional liquid chromatography-atmospheric pressure chemical ionization mass spectrometry using a single column has been applied for the identification and quantification of triacylglycerols in edible oils. A novel mixed-mode phenyl-hexyl chromatographic column was employed in this off-line two-dimensional separation system. The phenyl-hexyl column combined the features of traditional C18 and silver-ion columns, which could provide hydrophobic interactions with triacylglycerols under acetonitrile conditions and can offer π-π interactions with triacylglycerols under methanol conditions. When compared with traditional off-line comprehensive two-dimensional liquid chromatography employing two different chromatographic columns (C18 and silver-ion column) and using elution solvents comprised of two phases (reversed-phase/normal-phase) for triacylglycerols separation, the novel off-line comprehensive two-dimensional liquid chromatography using a single column can be achieved by simply altering the mobile phase between acetonitrile and methanol, which exhibited a much higher selectivity for the separation of triacylglycerols with great efficiency and rapid speed. In addition, an approach based on the use of response factor with atmospheric pressure chemical ionization mass spectrometry has been developed for triacylglycerols quantification. Due to the differences between saturated and unsaturated acyl chains, the use of response factors significantly improves the quantitation of triacylglycerols. This two-dimensional liquid chromatography-mass spectrometry system was successfully applied for the profiling of triacylglycerols in soybean oils, peanut oils and lord oils. A total of 68 triacylglycerols including 40 triacylglycerols in soybean oils, 50 triacylglycerols in peanut oils and 44 triacylglycerols in lord oils have been identified and quantified. The liquid chromatography-mass spectrometry data were analyzed using principal component analysis. The results of the principal component analysis enabled a clear identification of different plant oils. By using this two-dimensional liquid chromatography-mass spectrometry system coupled with principal component analysis, adulterated soybean oils with 5% added lord oil and peanut oils with 5% added soybean oil can be clearly identified.
authors.affiliation: Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, PR China; Hubei Key Laboratory of Lipid Chemistry and Nutrition, PR China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wei
authors.affiliation: Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, PR China; Hubei Key Laboratory of Lipid Chemistry and Nutrition, PR China.
authors.forename: Na
authors.initials: N
authors.lastname: Hu
authors.affiliation: Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, PR China; Hubei Key Laboratory of Lipid Chemistry and Nutrition, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Lv
authors.affiliation: Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, PR China; Hubei Key Laboratory of Lipid Chemistry and Nutrition, PR China.
authors.forename: Xu-Yan
authors.initials: XY
authors.lastname: Dong
authors.affiliation: Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, PR China; Hubei Key Laboratory of Lipid Chemistry and Nutrition, PR China. Electronic address: willasa@163.com.
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
mesh_terms: D001274:Atmospheric Pressure; D002853:Chromatography, Liquid; D004042:Dietary Fats, Unsaturated / Q000032:analysis*; D005504:Food Analysis / Q000295:instrumentation* / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D013058:Mass Spectrometry; D000074241:Peanut Oil; D010938:Plant Oils / Q000737:chemistry; D025341:Principal Component Analysis; D013024:Soybean Oil / Q000737:chemistry; D014280:Triglycerides / Q000032:analysis*
chemical_list: D004042:Dietary Fats, Unsaturated; D000074241:Peanut Oil; D010938:Plant Oils; D014280:Triglycerides; D013024:Soybean Oil
keywords: Adulteration; Edible oils; Off-line two-dimensional liquid chromatography; Response factor; Single column; Triacylglycerols