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A polycationic surfactant (hexadimetrine bromide, HDB), which dynamically coats the inner surface of the capillary and causes a fast anodic electroosmotic flow, was added to the electrolyte. The main factors affecting co\u2010electroosmotic flow (EOF) such as type of modifier, concentration, and influence of organic solvents have been studied. Other parameters such as pH, type, and concentration of buffer, applied voltage, and injection time were also optimised using hydrodynamic injection for 8 s and UV detection at 210 nm. The composition optimum of the running buffer used was a 20% 2\u2010propanol, 0.001% HDB, and 50 mM sodium borate at a pH value of 9.6. The method has been applied to determination and quantification of fourteen phenolic acids at ppb levels in olive oil samples after a liquid\u2010liquid extraction.<\/jats:p>","DOI":"10.1002\/jssc.200400107","type":"journal-article","created":{"date-parts":[[2005,5,25]],"date-time":"2005-05-25T09:46:35Z","timestamp":1117014395000},"page":"925-934","source":"Crossref","is-referenced-by-count":49,"title":["Co\u2010electroosmotic capillary electrophoresis determination of phenolic acids in commercial olive oil"],"prefix":"10.1002","volume":"28","author":[{"given":"Alegr\u00eda","family":"Carrasco Pancorbo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Segura Carretero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Fern\u00e1ndez Guti\u00e9rrez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,6,13]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1097\/00008469-199710000-00002"},{"key":"e_1_2_1_3_2","first-page":"102","volume":"9","author":"Caruso D.","year":"1999","journal-title":"Nutr. 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