Structure elucidation of deoxylutein II isomers by on-line capillary high performance liquid chromatography-1H nuclear magnetic resonance spectroscopy

Petra Hentschel, Marc David Grynbaum, Péter Molnár, Karsten Putzbach, Jens Rehbein, József Deli, Klaus Albert

Research output: Contribution to journalArticle

11 Citations (Scopus)


Thermal and iodine-catalyzed photochemical (Z/E)-isomerization of deoxylutein II [(3R,6′R)-3-hydroxy-3′,4′-didehydro-β,γ-car otene, anhydrolutein I] (2), the dehydration product of lutein [(3R,3′R,6′R)-β,ε-carotene-3,3′-diol] (4), yielded multi-component mixtures of (Z)-isomers. By I2-catalyzed photoisomerization, (9Z)-2, (9′Z)-2, (13Z)-2, (13′Z)-2 and (15Z)-2 are generated as main products. In addition, this thermodynamic-equilibrium mixture contains traces of (9Z,9′Z)-2 and other (di-Z)-isomers in minor concentrations. Thirteen isomers are chromatographically separated and detected on-line by UV-vis and mass spectrometry. (all-E)-Deoxylutein II (2) and six of its (Z)-configured isomers are separated by capillary HPLC (acetone-d6/D2O = 85:15) and detected on-line by 1H NMR spectroscopy in a microprobe. With the microprobe and the active detection volume of 1.5 μl, it is possible to perform structure elucidation with very small amounts available for various (Z)-isomers of deoxylutein II (2) in the isomerization mixture.

Original languageEnglish
Pages (from-to)285-292
Number of pages8
JournalJournal of Chromatography A
Issue number1-2
Publication statusPublished - Apr 21 2006


  • Anhydrolutein I
  • Deoxylutein II
  • Microprobe
  • Photoisomerization
  • Z-isomers

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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