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MEEKC separation of curcuminoids was optimized, and a change in resolution was explained using a modified equation for resolution in MEEKC without electroosmosis. The suitable MEEKC conditions for separation of curcuminoids were obtained to be the microemulsion buffer containing 50 mM phosphate buffer at pH 2.5, 1.1% v\/v<jats:italic> n<\/jats:italic>\u2010octane as oil droplets, 180 mM SDS as surfactant, 890 mM 1\u2010butanol as cosurfactant, and 25% v\/v 2\u2010propanol as organic cosolvent; applied voltage of \u201315 kV; and separation temperature 25\u00b0C. Achieved baseline resolution of C\u00a0:\u00a0D and D\u00a0:\u00a0B was obtained with <jats:italic> R<\/jats:italic><jats:sub>s<\/jats:sub> \u02dc2.4 and analysis time within 18 min. In addition, high accuracy and precision of the method were obtained. This MEEKC method was used for quantitative determination of individual curcuminoids in medicinal turmeric capsules and powdered turmeric used as coloring additive in food, with simple sample preparation such as solvent extraction, dilution, and filtration, and without cleaning up by SPE.<\/jats:p>","DOI":"10.1002\/jssc.200500333","type":"journal-article","created":{"date-parts":[[2006,3,14]],"date-time":"2006-03-14T12:47:31Z","timestamp":1142340451000},"page":"666-676","source":"Crossref","is-referenced-by-count":44,"title":["Microemulsion electrokinetic chromatography for separation and analysis of curcuminoids in turmeric samples"],"prefix":"10.1002","volume":"29","author":[{"given":"Thumnoon","family":"Nhujak","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Warangkana","family":"Saisuwan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Monpichar","family":"Srisa\u2010art","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amorn","family":"Petsom","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,3,14]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1080\/10408398009527278"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2797(99)00096-4"},{"key":"e_1_2_1_4_2","first-page":"117","volume":"111","author":"Reddy A. 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