Figure 1. Chemical structures of emamectin B1a (EMA B1a) and emamectin B1b (EMA B1b).
Figure 2. Schematic diagram of the present method using QuEChERS-EDTA (the Q3 method) and LC-MRM
Figure 3. MRM chromatograms from blank eel (A) and standard (5 ppb)-spiked eel (B) analyses. S and C stand for the screening transition peak and the confirmatory transition peak, respectively.
Table 1. Properties of emamectin B1a (EMA B1a)
Table 2. Recovery of emamectin B1a (EMA B1a) at 5 ppb from different QuEChERS methods. Q1: the Standard Method EN 15662 [13]; Q2: the QuEChERS-EDTA method from [14]; Q3: the Q2 method with modification
Table 3. Matrix effect of emamectin B1a (EMA B1a) on eel, halibut, and shrimp samples
Table 4. Method validation information
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