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All the experiments were carried out using a glass commercial ME device containing two pairs of integrated sensing electrodes. The running buffer composed of 20 mmol\/L amino\u20102\u2010(hydroxymethyl) propane\u20101,3\u2010diol and 10 mmol\/L 3,4\u2010dimethoxycinnamic acid provided the best separation conditions for COC and its adulterants with baseline resolution (<jats:italic>R<\/jats:italic>\u00a0&gt;\u00a01.6), separation efficiencies ranging from (2.9 \u00b1 0.1) to (3.2 \u00b1 0.2) \u00d7 10<jats:sup>5<\/jats:sup> plates\/m, and estimated LOD values between 40 and 150 \u03bcmol\/L. The quantification of COC was successfully performed in four samples seized by the Brazilian Federal Police Department and all predicted values agree with values estimated by the reference method. Some other interfering species were detected in the seized samples during the screening procedure on ME\u2013C<jats:sup>4<\/jats:sup>D devices. While lidocaine was detected in sample 3, the presence of levamisole was observed in samples 2 and 4. However, their concentrations were estimated to be below the LOQ. ME\u2013C<jats:sup>4<\/jats:sup>D devices have proved to be quite efficient for the identification and quantification of COC with errors lower than 10% when compared to the data obtained by a reference method. The approach herein reported offers great potential to be used for on\u2010site COC screening in seized samples.<\/jats:p>","DOI":"10.1002\/elps.201800137","type":"journal-article","created":{"date-parts":[[2018,6,27]],"date-time":"2018-06-27T02:23:10Z","timestamp":1530066190000},"page":"2188-2194","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Screening of seized cocaine samples using electrophoresis microchips with integrated contactless conductivity detection"],"prefix":"10.1002","volume":"39","author":[{"given":"Roger Cardoso","family":"Moreira","sequence":"first","affiliation":[{"name":"Instituto de Qu\u00edmica Universidade Federal de Goi\u00e1s  Goi\u00e2nia GO Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brenda M. 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