Lee, Joo Eun Oh, Han Bin Im, Hosub Han, Sang Beom Kim, Ki Hun 2024-01-19T17:03:05Z 2024-01-19T17:03:05Z 2021-09-05 2020-07-19 0021-9673 https://pubs.kist.re.kr/handle/201004/118376 In this study, a multiresidue analytical method was developed, validated, and applied for quantifying 85 persistent organic pollutants (POPs), including 38 polychlorinated biphenyls (PCBs), 23 polybrominated diphenyl ethers (PBDEs), and 24 organochlorine pesticides (OCPs) from 200 mu L of human serum. A modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method was applied to minimize the required sample amount and optimize various conditions including the extraction solvent and the number of extractions. The extraction efficiency was optimized using double extraction with an ethyl acetate/hexane/acetone mixture. Gas chromatography coupled with triple-quadrupole mass spectrometry was used for analysis, and two different ionization sources, electron impact ionization (EI) and atmospheric pressure chemical ionization (APCI), were used to compare their sensitivity. The APCI source employed soft ionization at atmospheric pressure, producing abundant molecular ion formation with minimal fragmentation, in contrast to extensive fragmentation caused by EI. Of the 85 POPs analyzed, 59 target compounds (69.4%) showed lower limits of detection that were two- to fifty-fold lower in APCI than those determined using EI. The developed method was validated for its detection limit (0.5-10 pg/mL for PCBs, 2-20 pg/mL for PBDEs, and 2-40 pg/mL for OCPs), precision (0.8%-34.3% of coefficient of variation), recovery (49.6%-77.1%), matrix effect (46.7%-156.9%), and accuracy (81.2%-113.1% for PCBs, 85.8%-112.2% for PBDEs, and 55.2%-113.9% for OCPs). Its linearity was R-2 > 0.99 for 84 compounds, and 96% average accuracy (for APCI) was obtained using the National Institute of Standards and Technology (NIST) standard reference materials (NIST 1957 and 1958). These ionization methods were compared by analyzing 25 real human serum samples. The observed species were 1.1-24.6 pg/mL of 28 PCBs, 2.5 pg/mL of BDE-47, and 6.5-195.1 pg/mL of 6 organochlorine pesticides (median concentration for each species), and only 11 compounds were detected with APCI owing to its enhanced sensitivity. (C) 2020 Elsevier B.V. All rights reserved. English ELSEVIER POLYBROMINATED DIPHENYL ETHERS BROMINATED FLAME RETARDANTS SOLID-PHASE EXTRACTION GAS-CHROMATOGRAPHY ORGANOCHLORINE PESTICIDES POLYCHLORINATED-BIPHENYLS ADIPOSE-TISSUE ASSOCIATION WOMEN POPS Multiresidue analysis of 85 persistent organic pollutants in small human serum samples by modified QuEChERS preparation with different ionization sources in mass spectrometry Article 10.1016/j.chroma.2020.461170 1 JOURNAL OF CHROMATOGRAPHY A, v.1623 JOURNAL OF CHROMATOGRAPHY A 1623 scie scopus 000538809300014 2-s2.0-85084942042 Biochemical Research Methods Chemistry, Analytical Biochemistry & Molecular Biology Chemistry Article POLYBROMINATED DIPHENYL ETHERS BROMINATED FLAME RETARDANTS SOLID-PHASE EXTRACTION GAS-CHROMATOGRAPHY ORGANOCHLORINE PESTICIDES POLYCHLORINATED-BIPHENYLS ADIPOSE-TISSUE ASSOCIATION WOMEN POPS Persistent organic pollutants Atmospheric pressure chemical ionization Electron impact ionization QuEChERS Human serum