Determination of perfluoroalkyl sulfonic acid compounds by matrix-assisted laser desorption ionization time of flight mass spectrometry

  • WANG Ning ,
  • LIU Donghao ,
  • RONG Junnan ,
  • ZHOU Qingqiong ,
  • QI Yaqiao ,
  • QI Ping
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  • (Guangzhou Institute for Food Inspection, Guangzhou 511410, China)

Received date: 2021-10-27

  Revised date: 2022-01-24

  Online published: 2022-12-20

Abstract

A matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) was developed for the rapid detection of perfluoroalkyl sulfonic acid compounds. MALDI-TOF MS signals of five kinds of perfluorobutane sulfonic acid were ana- lyzed using α-cyano-4-hydroxycinnamic acid (HCCA),2,5-dihydroxybenzoic acid (DHB) and sinapinic acid (SA) as a matrix.The spectrum produced by common matrix in negative ion reflection mode and the interference to analytes were investigated. An internal stand- ard quantitative determination method for PFOS was established using HCCA as a matrix,which solved the problem of difficult quantitative determination in MALDI-TOF MS.Results showed that the MALDI-TOF MS internal standard method had good repeatability and sensitivi- ty for the determination of PFOS in water.The linear correlation coefficient R2 was 0.997 9 in the concentration range of 5-500 ng/mL,the recovery rate of water samples was 65% to 106%,and the relative standard deviation (RSD) ranged from 2.36% to 17.7%.This method can be used to detect perfluorooctanesulfonic acid (PFOS) in water,and can effectively realize the rapid quantitative analysis of PFOS in environmental water samples.

Cite this article

WANG Ning , LIU Donghao , RONG Junnan , ZHOU Qingqiong , QI Yaqiao , QI Ping . Determination of perfluoroalkyl sulfonic acid compounds by matrix-assisted laser desorption ionization time of flight mass spectrometry[J]. Food and Fermentation Industries, 2022 , 48(22) : 292 -298 . DOI: 10.13995/j.cnki.11-1802/ts.029816

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