Characterisation of diarylheptanoid- and flavonoid-type phenolics in corylus avellana L. Leaves and bark by HPLC/DAD-ESI/MS

Eszter Riethmüller, Ágnes Alberti, Gergo Tõth, Szabolcs Béni, Francesco Ortolano, Ágnes Kéry

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Introduction The leaves of Corylus avellana L. (common hazel, Betulaceae), a plant with a wide distribution in Europe, have been used in folk medicine for various diseases, but phytochemical exploration of C. avellana is still incomplete. To the best of our knowledge there is no previous report concerning diarylheptanoids in C. avellana, although these compounds show a frequent occurrence among Betulaceae plants. Objective To improve existing online chromatographic methods for the investigation of the phenolic compounds in C. avellana leaves and bark, focusing on diarylheptanoid-type molecules. Methods Dried and powdered leaves and bark of C. avellana were extracted with increasing polarity solvents (n-hexane, chloroform, ethyl acetate and methanol) in Soxhlet extractor apparatus. For the characterisation of the phenolic compounds in the ethyl acetate and methanolic extracts, UV spectral data, obtained by LC with a diode-array detector (DAD), accurate molecular mass and formula, acquired by LC and electrospray ionisation (ESI) with time-of-flight (TOF) MS and fragmentation pattern, given by LC-ESI/MS/MS analyses were used. Quantitation of the compounds was performed by LC-MS/MS. Results In the methanolic and ethyl acetate extracts of C. avellana bark four flavonoid glycosides and a caffeoyl hexoside derivative were detected and characterised, while in C. avellana leaves, seven diarylheptanoid-type molecules were tentatively identified in addition to six flavonoid components. As far as we know this is the first study where the presence of diarylheptanoids in C. avellana is reported. Conclusion The improved HPLC/DAD-ESI/MS method was successfully utilised for the characterisation and quantitation of the phenolic compounds in C. avellana bark and leaves extracts.

Original languageEnglish
Pages (from-to)493-503
Number of pages11
JournalPhytochemical Analysis
Volume24
Issue number5
DOIs
Publication statusPublished - Sep 2013

Keywords

  • Corylus avellana
  • HPLC-MS
  • diarylheptanoid
  • flavonoid
  • hazel

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science
  • Biochemistry
  • Molecular Medicine
  • Plant Science
  • Drug Discovery
  • Complementary and alternative medicine

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