Laser-induced electron transfer desorption/ionization on MoO 3 and WO 3 surfaces for the determination of dithiocarbamates.

Autor: Grechnikov AA; Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, Kosygin str., 19, Moscow, 119991, Russia. grechnikov@geokhi.ru., Laptinskaya PK; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia., Kuzmin II; Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, Kosygin str., 19, Moscow, 119991, Russia., Borodkov AS; Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, Kosygin str., 19, Moscow, 119991, Russia., Simanovsky YO; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia., Nikiforov SM; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia.
Jazyk: angličtina
Zdroj: Analytical and bioanalytical chemistry [Anal Bioanal Chem] 2022 Sep; Vol. 414 (23), pp. 6929-6937. Date of Electronic Publication: 2022 Aug 05.
DOI: 10.1007/s00216-022-04258-2
Abstrakt: Surface layers of molybdenum oxide MoO 3 and tungsten oxide WO 3 produced by thermal oxidation of molybdenum and tungsten plates in the air were studied for the first time as a platform for laser-induced electron transfer desorption/ionization. High analytical performance of such layers for the determination of metal complexes with dithiocarbamates, such as tetramethylthiuram disulfide, tetraethylthiuram disulfide, and diethyldithiocarbamate, has been demonstrated. All studied complexes are detected as radical cations, with no fragment ions. The ion yields from MoO 3 and WO 3 surfaces were found to be more than two orders of magnitude higher than those from nanocrystalline silicon surfaces. A novel method has been developed for the determination of trace amounts of dithiocarbamates based on the complexation of analytes with gold ions, followed by laser-induced electron transfer desorption/ionization. The limits of detection of dithiocarbamates were estimated to be about 1 ng/mL. The proposed method was successfully applied to the rapid screening of tetramethylthiuram disulfide residues in juice.
(© 2022. Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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