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Several experimental parameters such as stationary phase type, mobile phase composition, buffer and pH, inner diameter of the columns, sample injection, were evaluated to obtain the complete separation of the analysed compounds. Baseline resolution of the studied polyphenols was achieved within 30 min by using a capillary column (id 100 \u03bcm) packed with bidentate C<jats:sub>18<\/jats:sub> particles for 24.5 cm and a mobile phase composed of 5 mM ammonium acetate buffer pH 4 with H<jats:sub>2<\/jats:sub>O\/ACN (80:20, v\/v). The applied voltage and the temperature were set at 30 kV and 20\u00b0C. Precision, detection and quantification limits, linearity, and accuracy were investigated. A good linearity (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> &gt; 0.9992) was achieved over a concentration working range of 2\u2013100 \u03bcg\/mL for all the analytes. LOD and LOQ were 1 and 2 \u03bcg\/mL, respectively, for all studied compounds. The CEC method was applied to the analysis of those polyphenols in green and black tea samples after an extraction procedure. Good recovery data from accuracy studies ranged between 90% and 112% for all analytes.<\/jats:p>","DOI":"10.1002\/jssc.200800634","type":"journal-article","created":{"date-parts":[[2009,3,5]],"date-time":"2009-03-05T10:30:21Z","timestamp":1236249021000},"page":"1002-1010","source":"Crossref","is-referenced-by-count":24,"title":["Separation of catechins and methylxanthines in tea samples by capillary electrochromatography"],"prefix":"10.1002","volume":"32","author":[{"given":"Ulku","family":"Dilek Uysal","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zeineb","family":"Aturki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Augusta","family":"Raggi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Salvatore","family":"Fanali","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,3,19]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/jf980223x"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/10408399209527581"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1093\/jn\/130.2.472S"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1097\/00041433-200202000-00007"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.lfs.2005.12.006"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1271\/bbb1961.55.1425"},{"key":"e_1_2_1_8_2","doi-asserted-by":"crossref","first-page":"968","DOI":"10.1128\/aem.59.4.968-973.1993","volume":"59","author":"Nakahara K.","year":"1993","journal-title":"Appl. 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