Integrating Effect-Directed Analysis and Chemically Indicative Mass Spectral Fragmentation to Screen for Toxic Organophosphorus Compounds.
Anal Chem
; 95(5): 2623-2627, 2023 02 07.
Article
em En
| MEDLINE
| ID: mdl-36689728
ABSTRACT
Analytical chemists are often challenged to screen for bioactive compounds in complex matrices, sometimes without a priori knowledge of the exact compound of interest. Therefore, "flagging" techniques, highlighting common characteristics of bioactive compounds, are highly sought after. In this work, we demonstrate a double flagging method, where unknown organophosphorus acetylcholinesterase inhibitors are "flagged" out of a complex matrix by the presence of organophosphorus-indicative ions as well as their acetylcholinesterase inhibition. This is accomplished by flagging the LC chromatographic retention time of phosphorus-indicative ions using accurate mass high-energy in-source CID products, and the retention time of acetylcholinesterase inhibiting compounds using a parallel microfractionation-based bioassay. We successfully apply this method to screen VX, VM, and RVX nerve agents as well as methomyl, a carbamate pesticide, out of soil and whole blood samples at low µM to sub-µM concentrations. This methodology can be easily extended to diverse chemical families and biological activities of interest.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Compostos Organofosforados
/
Acetilcolinesterase
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article