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For analysis with liquid chromatography\u2013mass spectrometry (LC\u2010MS), chemical derivatization at the steroid moiety is a technique to improve the positive ionization efficiency of glucuronidated\/sulfated EAAS under collision\u2010induced dissociation (CID) conditions. However, regarding the chromatographic performance, there are still challenges to address, for example, poor peak shape, which is mainly caused by nondefined adsorption in the chromatographic system. Here, we show a novel derivatization technique for the analysis of selected phase II metabolites of EAAS, where the acidic moiety of the glucuronide\/sulfate is methylated with different methylation reagents to reduce nondefined adsorption. The methylation reagent trimethylsilyl\u2010diazomethane (TMSD) was preferred over the other tested reagents methyl iodide (MeI) and dimethyl sulfate (DMS). Glucuronidated and sulfated testosterone and epitestosterone were methylated, and their chromatographic performance and CID ion mass spectra obtained in positive ionization mode were investigated. The peak width and peak height were significantly improved for all substances. Methylated testosterone sulfate showed the best results with a 3.5 times narrower peak and 14 times increased intensity compared with underivatized testosterone sulfate. Furthermore, CID ion mass spectra obtained in positive ionization mode showed product ions characteristically for the steroidal backbone for all substances. This preliminary study shows the potential of methylation as a supplementary derivatization technique, which can assist in the development of more sensitive methods due to the improvements in method performance.<\/jats:p>","DOI":"10.1002\/dta.3694","type":"journal-article","created":{"date-parts":[[2024,4,21]],"date-time":"2024-04-21T19:24:31Z","timestamp":1713727471000},"page":"205-215","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Methylation of phase II metabolites of endogenous anabolic androgenic steroids to improve analytical performance"],"prefix":"10.1002","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8878-7551","authenticated-orcid":false,"given":"Sandra","family":"Pfeffer","sequence":"first","affiliation":[{"name":"Department of Pharmacy UiT \u2013 The Arctic University of Norway  Troms\u00f8 Norway"},{"name":"Doping Control Laboratory Seibersdorf Labor GmbH  Seibersdorf Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3968-2048","authenticated-orcid":false,"given":"Guenter","family":"Gmeiner","sequence":"additional","affiliation":[{"name":"Doping Control Laboratory Seibersdorf Labor GmbH  Seibersdorf Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9049-9463","authenticated-orcid":false,"given":"Guro","family":"Forsdahl","sequence":"additional","affiliation":[{"name":"Department of Pharmacy UiT \u2013 The Arctic University of Norway  Troms\u00f8 Norway"},{"name":"Doping Control Laboratory Seibersdorf Labor GmbH  Seibersdorf Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,4,21]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.toxlet.2005.06.005"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.beem.2021.101609"},{"key":"e_1_2_6_4_1","unstructured":"(WADA) WADA.The prohibited list.https:\/\/www.wada-ama.org\/en\/prohibited-list. 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