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Normal stacking mode (NSM), field\u2010enhanced sample injection (FESI), and stacking with matrix removal (SWMR) are explored to increase the sensitivity of the CE\u2010UV analysis of a selected group of pesticides (cyprodinil, cyromazine, pyrifenox, pirimicarb, and pyrimethanil). It could be observed that reverse polarity\u2010stacking with matrix removal (RP\u2010SWMR) provided the best results in terms of sensitivity (enhancement was up to 272\u2010fold compared with normal injection). The separation buffer consisted of 0.4\u00a0m<jats:sc>M<\/jats:sc> cetyltrimethylammonium chloride (CTAC), 0.4\u00a0<jats:sc>M<\/jats:sc> acetic acid at pH 4 containing 5% v\u200a\/\u200av 2\u2010propanol. This approach was then combined with SPME to determine the pesticides in water, apple, and orange juice. The combination of both preconcentration procedures allowed the determination of these pesticides at concentrations down to 2.5\u00a0\u03bcg\u200a\/\u200aL in water and 3.1\u00a0\u03bcg\u200a\/\u200aL in juices (<jats:italic>i.e.,<\/jats:italic> levels well below the maximum residue limits allowed for these compounds). To our knowledge, this is the first report showing the great possibilities of the combined use of SPME, on\u2010line sample preconcentration, and CE for pesticide analysis.<\/jats:p>","DOI":"10.1002\/elps.200410321","type":"journal-article","created":{"date-parts":[[2005,2,15]],"date-time":"2005-02-15T09:49:06Z","timestamp":1108460946000},"page":"980-989","source":"Crossref","is-referenced-by-count":55,"title":["Combining solid\u2010phase microextraction and on\u2010line preconcentration\u2010capillary electrophoresis for sensitive analysis of pesticides in foods"],"prefix":"10.1002","volume":"26","author":[{"given":"Javier","family":"Hern\u00e1ndez\u2010Borges","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alejandro","family":"Cifuentes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francisco 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