Shaowei Li,Yuting Yuan,Liangxiao Zhang,Fei Ma,Peiwu Li
This study was based on QuEChERS cleanup coupled with UHPLC-MS/MS for the determination of γ-oryzanol compounds in vegetable oils. Several parameters of QuEChERS and UHPLC-MS/MS were studied for purification and detection of γ-oryzanol compounds in oil samples. Under the optimized conditions, the whole pretreatment procedure could be accomplished within 10 min without tedious procedure, larger volume of organic solvent and complicated apparatus. The limit of detections and the limit of quantifications for γ-oryzanol compounds were ranging from 0.1-0.3 µg kg −1 and 0.4–1.0 µg kg −1 , respectively. Satisfactory recoveries of all analyts were ranging from 72.2 % to 101.3 %, and the intra-day and inter-day precision were less than 10.6 %. The validation indicated that rice band oil and corn oil were rich in 24-mCAF, CAF, β-SIF, CMF and STF. The QuEChERS-UHPLC-MS/MS simultaneously quantified five γ-oryzanol compounds in lipid matrices and assessed the nutritional and functional substances of vegetable oils.
By utilizing gas chromatography tandem mass spectrometry (GC/MS) and QuEChERS purification technology, a new method was developed for the detection of seven acrylate compounds (methyl methacrylate, butyl acrylate, sec-butyl acrylate, 2-ethylhexyl acrylate, glycidyl methacrylate, n-octyl acrylate, and N-octyl methacrylate) in food contact paper products. Hexane was used as the extraction solvent and carbon nanotubes were used as adsorbents during the QuEChERS purification. The acrylates were separated by an ultra-inert column (DB-5MS UI) and detected in the electron ionization mode of MS with selected ions monitoring (SIM). Under the optimal conditions, the calibration curves for the seven analytes were linear in the range of 5.0–1000 μg L−1 with the correlation coefficients higher than 0.9984. The quantitation limits of the method (S/N = 10) of these acrylates were in the range of 50.0–100.0 μg kg−1. The mean recoveries for paper products at three spiked concentration levels of 50.0–1000 μg kg−1 were in the range of 82.1–106.5%, and the relative standard deviations (RSDs, n = 6) ranged from 1.5% to 5.6%. This method is accurate, simple and rapid, and could be applied to the detection of acrylates in food contact paper products.
危险品化学品经营许可证（带存储）