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During the optimization of field\u2010amplified sample injection\u2010sweeping MEEKC, the composition of sample matrix and the length of acidic plug were found to be the predominant influences for penicillin stacking. Both zwitterionic ampicillin and amoxicillin could only be stacked through cation\u2010selective\u2010exhaustive\u2010injection sweeping, whereas the other six penicillin compounds were found to be concentrated by anion\u2010selective\u2010exhaustive\u2010injection sweeping. Hence, in order to simultaneously concentrate the eight penicillins in a single\u2010run sweeping step, a combination of successive anion\u2010 and cation\u2010selective injections was used. When compared with previous CE\u2010UV methods, the proposed on\u2010line concentration MEEKC method provided better detection sensitivity and faster separation for these penicillins either in single ion\u2010selective injection or in successive anion\u2010\/cation\u2010selective injection where the LODs were in the range of 0.2\u20132.8\u2009\u00b5g\/L and 0.5\u20135.8\u2009\u00b5g\/L, respectively.<\/jats:p>","DOI":"10.1002\/elps.200800008","type":"journal-article","created":{"date-parts":[[2008,10,13]],"date-time":"2008-10-13T08:54:58Z","timestamp":1223888098000},"page":"3905-3915","source":"Crossref","is-referenced-by-count":23,"title":["Sample stacking for the analysis of penicillins by microemulsion electrokinetic chromatography"],"prefix":"10.1002","volume":"29","author":[{"given":"Hsi\u2010Ya","family":"Huang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shih\u2010Huan","family":"Hsieh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2008,10,10]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2004.05.057"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/rcm.964"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.aca.2004.04.022"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2005.10.073"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9673(04)01289-0"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/rcm.381"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1522-2683(19991001)20:15\/16<3269::AID-ELPS3269>3.0.CO;2-3"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1002\/1522-2683(200111)22:19<4249::AID-ELPS4249>3.0.CO;2-8"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/elps.200305639"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/elps.200500430"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jchromb.2003.10.017"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0731-7085(03)00195-X"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9673(97)00311-7"},{"key":"e_1_2_6_15_2","doi-asserted-by":"crossref","first-page":"951","DOI":"10.1093\/jaoac\/80.5.951","volume":"80","author":"Cutting J. 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