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Quantitative Determination of Bulk Molecular Concentrations of β‑Agonists in Pork Tissue Samples by Direct Internal Extractive Electrospray Ionization-Mass Spectrometry

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posted on 09.10.2017, 00:00 authored by Jiaquan Xu, Shengrui Xu, Yipo Xiao, Konstantin Chingin, Haiyan Lu, Runhan Yan, Huanwen Chen
Rapid quantitative determination of bulk molecular concentration in solid samples without sample pretreatment is demonstrated using the internal extractive electrospray ionization-mass spectrometry (iEESI-MS) analysis of six β-agonists, including salbutamol (Sal), clenbuterol (Cle), ractopamine (Rac), terbutaline (Ter), tulobuterol (Tul), brombuterol (Bro), in pork tissue samples. Single sample analysis only required 1 min. The linear range of detection was about 0.01–1000 μg/kg (R2 > 0.9994). The limit-of-detection (LOD) varied from 0.002 μg/kg for Sal to 0.006 μg/kg for Tul. Relative standard deviation (RSD) of quantitation was in the range 6.5–11.3%. The analytical results were validated by gas chromatography–mass spectrometry (GC–MS) and high-performance liquid chromatography–mass spectrometry (LC–MS), showing the accuracy rates of 92–105%. The current study extends the power of ambient MS as a method for the quantification of molecules at the surface of solid samples (e.g., in μg/cm2 units) toward the quantification of molecules in bulk sample volume (i.e., in μg/kg units), which is commonly required in food safety control, biomedical analysis, public security, and many other disciplines.

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