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Nanoextraction coupled to liquid chromatography mass spectrometry delivers improved spatially resolved analysis

Lewis, Holly-May, Webb, Roger, Verbeck, Guido F, Bunch, Josephine, De Jesus, Janella, Costa, Catia, Palitsin, Vladimir, Swales, John G., Goodwin, Richard J. A., Sears, Patrick and Bailey, Melanie Jane (2019) Nanoextraction coupled to liquid chromatography mass spectrometry delivers improved spatially resolved analysis Analytical Chemistry.

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Abstract

Direct analyte probed nanoextraction (DAPNe) is a technique that allows extraction of drug and endogenous compounds from a discrete location on a tissue sample using a nano capillary filled with solvent. Samples can be extracted from a spot diameters as low as 6 µm. Studies previously undertaken by our group have shown that the technique can provide good precision (5%) for analysing drug molecules in 150 µm diameter areas of homogenised tissue, provided an internal standard is sprayed on to the tissue prior to analysis. However, without an isotopically labelled standard, the repeatability is poor, even after normalisation to and the spot area or matrix compounds. By application to tissue homogenates spiked with drug compounds, we can demonstrate that it is possible to significantly improve the repeatability of the technique by incorporating a liquid chromatography separation step. Liquid chromatography is a technique for separating compounds prior to mass spectrometry (LC-MS) which enables separation of isomeric compounds that cannot be discriminated using mass spectrometry alone, as well as reducing matrix interferences. Conventionally, LC-MS is carried out on bulk or homogenised samples, which means analysis is essentially an average of the sample and does not take into account discrete areas. This work opens a new opportunity for spatially resolved liquid chromatography mass spectrometry with precision better than 20%.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Lewis, Holly-Mayholly-may.lewis@surrey.ac.uk
Webb, RogerR.Webb@surrey.ac.uk
Verbeck, Guido F
Bunch, Josephine
De Jesus, Janellaj.dejesus@surrey.ac.uk
Costa, Catiac.d.costa@surrey.ac.uk
Palitsin, VladimirV.Palitsin@surrey.ac.uk
Swales, John G.
Goodwin, Richard J. A.
Sears, Patrickp.sears@surrey.ac.uk
Bailey, Melanie JaneM.Bailey@surrey.ac.uk
Date : 20 November 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1021/acs.analchem.9b02821
Grant Title : Strategic equipment award
Copyright Disclaimer : Copyright © 2019 American Chemical Society
Depositing User : Clive Harris
Date Deposited : 27 Nov 2019 16:53
Last Modified : 27 Nov 2019 17:16
URI: http://epubs.surrey.ac.uk/id/eprint/853208

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