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The CD\u2010MEKC was based on SDS as surfactant (90\u2009mM) and hydroxypropyl\u2010\u03b2\u2010CD (25\u2009mM) as chiral selector, under acidic conditions (25\u2009mM borate\u2013phosphate buffer, pH 2.5). The method was first applied to study the thermal epimerisation of epi\u2010structured catechins, (\u2212)\u2010epicatechin and (\u2212)\u2010epigallocatechin, to non\u2010epi\u2010structured (\u2212)\u2010catechin and (\u2212)\u2010gallocatechin. The latter compounds, being non\u2010native molecules, were for the first time regarded as useful phytomarkers of tea samples subjected to thermal treatment. The proposed method was applied to the analysis of more than twenty tea samples of different geographical origins (China, Japan, Ceylon), having undergone different storage conditions and manufacturing processes. Finally, factor analysis was used to visualise the useful information contained in the data set, showing that it was possible to distinguish tea samples on the basis of their different contents of native and non\u2010native catechins.<\/jats:p>","DOI":"10.1002\/elps.200800795","type":"journal-article","created":{"date-parts":[[2009,7,27]],"date-time":"2009-07-27T07:49:36Z","timestamp":1248680976000},"page":"2922-2930","source":"Crossref","is-referenced-by-count":40,"title":["Differentiation of green tea samples by chiral CD\u2010MEKC analysis of catechins 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