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• W3045462912 abstract "Direct analysis of chemicals on a surface using mass spectrometry (MS) is of great importance in forensics, food and drug safety, environmental monitoring, and defense. Solvent extraction-based surface analysis offers a convenient way of controlling the desorption conditions and applying internal standards. To date, it mainly relies on a separate electrospray process to nebulize and ionize the solvents. Here, we report a simple and stand-alone ionization system for the solvent extraction-based surface analysis without the need for high voltage, based on vibrating sharp-edge spray ionization (VSSI).We modified the original VSSI device and developed a stand-alone, integrated surface sampling, and ionization system for MS analysis. By incorporating a micropipette-based solvent dispenser with the VSSI device, the new system performs solvent extraction and ionization, and still maintains a small footprint.We demonstrated a four order-of-magnitude linear response for glucose spotted on a glass surface with a limit of detection (LOD) of 0.1 pg/mm2 . We further characterized the performance of this method with a series of compounds and demonstrated a similar LOD to literature values obtained by desorption electrospray ionization. Finally, we applied this method to quantitatively measure the concentration of a pesticide ametryn on spinach surfaces. We demonstrated good linearity (R2 = 0.99) for ametryn with surface densities in the range of 8-800 pg/mm2 and an LOD of 9 pg/mm2 .We have demonstrated a simple, effective, direct ambient-ionization method that is highly sensitive to molecules on a wide range of surfaces. The flexibility, small footprint, low cost, and voltage-free nature of this method make it an attractive technique for direct surface sample analysis using MS." @default.
• W3045462912 created "2020-07-29" @default.
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• W3045462912 date "2020-08-17" @default.
• W3045462912 modified "2023-10-18" @default.
• W3045462912 title "Direct analysis of surface chemicals using vibrating sharp‐edge spray ionization mass spectrometry" @default.
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• W3045462912 doi "https://doi.org/10.1002/rcm.8902" @default.
• W3045462912 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7811172" @default.
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• W3045462912 hasPublicationYear "2020" @default.
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