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Chemical fixation has been previously applied to mammalian cells prior to sample introduction so that they can be resuspended in a solution suitable for SC-ICP-MS. However, the effect of fixation on the elemental composition of suspended cells is unknown, and robust methodologies are urgently needed so that the community can measure the effects of intracellular pathogens on elemental composition of their host cells. We demonstrate that different fixatives impact measured cell elemental composition. We have compared suspensions treated using different fixatives (methanol 60\u2013100% in H<jats:sub>2<\/jats:sub>O and 4% paraformaldehyde in phosphate-buffered saline solution), and the number of distinguishable single cell events, keeping a constant particle number concentration. Significantly more single cell events (<jats:italic>n<\/jats:italic>\u2009=\u20093, <jats:italic>P<\/jats:italic>\u2009\u2264\u20090.05) were observed for Ca and Mg when cells were fixed in 4% paraformaldehyde than for the methanol-based fixatives, confirming the hypothesis that methanol fixatives cause leaching of these elements from the cells. The impact of fixation on Mn and Zn was less pronounced. Microbial and viral infection of eukaryotic cells can have profound effects on their elemental composition, but chemical fixation is necessary to render infected cells safe before analysis. We have successfully applied our methodology to a macrophage model of tuberculosis demonstrating utility in understanding metal homeostasis during microbial infection of mammalian cells.<\/jats:p>\n                <jats:p><jats:bold>Graphical Abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s00216-024-05592-3","type":"journal-article","created":{"date-parts":[[2024,10,17]],"date-time":"2024-10-17T18:04:01Z","timestamp":1729188241000},"page":"6945-6955","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Single cell\u2013inductively coupled plasma\u2013mass spectrometry (SC-ICP-MS) reveals metallic heterogeneity in a macrophage model of infectious diseases"],"prefix":"10.1007","volume":"416","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6120-4451","authenticated-orcid":false,"given":"Claire","family":"Davison","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4373-1829","authenticated-orcid":false,"given":"Jordan","family":"Pascoe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9050-7910","authenticated-orcid":false,"given":"Melanie","family":"Bailey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6579-1366","authenticated-orcid":false,"given":"Dany J. 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