Determination of β-Agonist Residues in Animal-Derived Food by a Liquid Chromatography-Tandem Mass Spectrometric Method Combined with Molecularly Imprinted Stir Bar Sorptive Extraction

Figure 6

Multiple reaction monitoring (MRM) chromatograms showing the transitions corresponding to the quantifier ions of six β-agonists. (a) The blank pork sample; (b) the pork sample spiked with each β-agonist at LOD level; (c) the real pork sample; (d) the pork sample spiked with each β-agonist at 5.0 μg/kg.

(a)

(b)

(c)

(d)