Chiral cyclodextrin-modified micellar electrokinetic chromatography and chemometric techniques for green tea samples origin discrimination

Benedetta Pasquini, Serena Orlandini, Mohammad Goodarzi, Claudia Caprini, Roberto Gotti, Sandra Furlanetto

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Catechins and methylxanthines were determined in 92 green tea (GT) samples originating from Japan and China by using micellar electrokinetic chromatography with the addition of (2-hydroxypropyl)-β-cyclodextrin. GT samples showed high concentrations of (-)-epigallocatechin gallate and caffeine, with (-)-epigallocatechin, (-)-epicatechin gallate and (-)-epicatechin in relevant content and (+)-catechin, (-)-catechin and theobromine in much lower amounts. The amount of all the considered compounds was higher for Chinese GTs, with the exception of (-)-epicatechin gallate. Pattern recognition methods were applied to discriminate GTs according to geographical origin, which is an important factor to determine quality and reputation of a commercial tea product. Data analysis was performed by principal component analysis and hierarchical cluster analysis as exploratory techniques. Linear discriminant analysis and quadratic discriminant analysis were utilized as discrimination techniques, obtaining a very good rate of correct classification and prediction.

Original languageEnglish (US)
Pages (from-to)7-13
Number of pages7
JournalTalanta
Volume150
DOIs
StatePublished - Apr 1 2016

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Keywords

  • Capillary Electrophoresis
  • Classification models
  • Discriminant analysis
  • Green tea
  • Hierarchical cluster analysis
  • Principal component analysis

ASJC Scopus subject areas

  • Chemistry(all)

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