Citation: ZHANG Mei-Juan, CHEN Jia, LIN Ying, ZHANG Ya-Jiao, GUO Lei, XU Bin, XIE Jian-Wei. Identification of Unknown Toxicants in Food Poisoning by High Resolution Mass Spectrometry-Data Independent Acquisition-Post Targeted Screening Strategy[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(2): 157-164. doi: 10.11895/j.issn.0253-3820.171139 shu

Identification of Unknown Toxicants in Food Poisoning by High Resolution Mass Spectrometry-Data Independent Acquisition-Post Targeted Screening Strategy

Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, and State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China

Received Date: 3 August 2017
Revised Date: 26 September 2017

Based on ultra-high-performance liquid chromatography-quadrupole/time of flight mass spectrometry (UPLC-Q-TOF MS/MS), a post targeted screening strategy using high resolution mass spectrometry under data independent acquisition was established, and successfully applied to screen and identify unknown toxicants in food poisoning patients' vomit and feces. After solvent extraction, the samples were separated and analyzed on a reversed-phase C₁₈ column using a gradient elution program of 5 mmol/L ammonium formate and 0.1% formic acid aqueous solution (A) and 0.1% formic acid in acetonitrile solution (B). All-ions MS/MS information of samples was obtained using Q-TOF MS (ESI+) in MSE mode, followed by peak recognition and library searching using the UNIFI Scientific Information System, as a result, suspected toxic compound α-solanine was primarily detected. Furthermore, the related chemicals including hydrolysates and metabolites were identified in both samples based on post-targeted screening strategy, such as α-chaconine, β-chaconine, γ-solanine/chaconine and solanidine. The concentration of α-solanine in both samples was approximately 0.1 mg/kg by one-point calibration method, the total amount of solanine analogues in two samples was about 0.5 mg/kg and 0.6 mg/kg respectively through normalization of peak area. The high resolution mass spectrometry screening strategy established here could provide efficient screening method for rapid detection and identification of toxicants in unknown food poisoning.
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