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Each matrix was subjected to three sample preparation methods prior to LC-MS/MS analysis. A comparison of the three methods is presented in Table 1. ...
Each of the 20 calibration standards were analyzed using LC-MS/MS with an Ascentis Express RP-Amide column. Figure 1 shows the calibration curve for ethoprophos.The RP-Amide column was selected instead of a traditional C18 column because it provides increased selectivity for polar compounds, especially those that can act as a hydrogen-bond donor. ...
The sensitive and accurate detection of very low levels of these compounds is critical to efforts to identify contaminated products. LC-MS/MS is a popular analytical technique for this purpose.ExperimentalA 5 gram cereal sample was spiked with 15 mycotoxins as follows (aflatoxins at 0.25 to 5 ng/mL; ochratoxins at 0.125 to 2.5 ng/mL; all others ...
liquid micro-extraction2. solid-phase clean-up 3. LC/MS/MS or GC/MS analysis QuEChERS continues to undergo modifications for improved sample preparation in a broad array of analytes in a vast array of matrices. ...
. • Carbon removes pigments and sterols• NH2 removes fatty acids, polar pigments, organic acids, and sugarsRemoving these matrix materials reduces interferences that can lead to ion suppression in LC-MS, inlet contamination in GC-MS, and column contamination for both techniques. ...
