Evaluation of matrix effect in determination of mevinphos stereoisomers in tobacco by supercritical fluid chromatography tandem mass spectrometry

Porous poly(bismaleimide‐co‐divinylbenzene) microspheres as dispersive solid‐phase extraction adsorbent coupled to high‐performance liquid chromatography for the determination of triazine herbicide residues in vegetable samples

“…As shown in Figure S5 and Table S2, the linear fit results of the pseudo‐second‐order kinetic model (R 2 , 0.9936–0.9981) were better than those of the pseudo‐first‐order kinetic model (R 2 , 0.7598–0.9342), illustrating chemical adsorption of THs on PBMs. Langmuir adsorption isotherms (Equation S3) and Freundlich adsorption isotherms (Equation S4) were generated by plotting Ce/Qe versus Ce and lnQe versus lnCe, respectively [33]. As shown in Table S3, the adsorption isotherms were more consistent with the Langmuir model (R 2 , 0.9048–0.9925) than the Freundlich model (R 2 , 0.7192–0.9070), indicating monolayer adsorption of the PBMs towards THs.…”

“…It can be seen that the signal intensity of THs after DSPE treatment is higher than that before DSPE. The matrix effects (MEs, %) were evaluated based on the peak area of THs in blank samples, spiked samples, and spiked ultrapure water, and the obtained data were analyzed according to Equation S5 [33]. The ME of the THs in different samples (Table S6) was < 20%, demonstrating that the MEs were acceptable.…”

Separation and purification of active ingredients in tobacco by free-flow electrophoresis

“…Currently, the main extraction methods of active substances in tobacco include the ion exchange resin method, 9 solvent extraction method, 10 ultrasonic/microwave-assisted extraction method, 11,12 and supercritical extraction method. 13 For example, Tita et al studied the supercritical CO 2 extraction of nicotinol and nicotine from tobacco residue, and the extraction yield could reach 33.33 g of silanol per kg raw material. 14 Li et al first developed a method combining capillary zone electrophoresis (CZE) and microwave-assisted extraction (MAE) for the rapid and quantitative detection of chlorogenic acid (CA) in tobacco residues.…”

Comparison of supercritical fluid chromatography–tandem mass spectrometry and liquid chromatography–tandem mass spectrometry for the stereoselective analysis of chlorfenvinphos and dimethylvinphos in tobacco

“…A number of methods for the determination of organophosphorus compounds have been reported in the literature [5][6][7][8]. However, few reports have investigated the separation and measurements of E-Z isomers of organophosphorus compounds [9][10][11], especially CFVP and DMVP. The separation of stereoisomers is conducted mainly through normal-phase liquid chromatography (NPLC), which is time consuming and requires large amounts of harmful organic solvents [12][13][14].…”