Comparison of chemical profiles of Kānuka (Kunzea robusta de Lange & Toelken, Myrtaceae) essential oils

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Lewe, N.
Young, M.
Vorster, J.
Paenga, B.
Skinner, D.
Harcourt, N.
de Lange, Peter
Haira, T.
Blockley-Powell, S.
Munkasci, A.
Kaysers, R.
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Journal Article
Ngā Upoko Tukutuku (Māori subject headings)
New Zealand
kānuka (Kunzea robusta)
essences and essential oils
botanical chemistry
Māori medicine
ANZSRC Field of Research Code (2020)
Lewe, N., Young, M., Vorster, J., Paenga, B., Skinner, D., Harcourt, N., de Lange, P., Haira, T., Blockley-Powell, S., Munkacsi, A., & Keysers, R. (2023). Comparison of chemical profiles of Kānuka (Kunzea robusta de Lange & Toelken, Myrtaceae) essential oils. Phytochemistry letters, 56, 50-56. htpp://doi:10.1016/j.phytol.2023.06.006
HIGHLIGHTS • Pilot study statistically comparing GCMS and NMR data of kānuka essential oils. • Both analytical platforms deliver statistically consistent results. • Either approach is suitable for chemometrics analysis of kānuka. •Determination of absolute configuration of α-pinene as (+)-enantiomer. ABSTRACT Kānuka/rawirinui (Kunzea robusta de Lange & Toelken) is an endemic plant species in Aotearoa/New Zealand, which is still used today and traditionally by Māori. Chemical profiling of kānuka essential oils has been performed previously, although comprehensive studies are rare, as is the integration of multiple analytical platforms. In this study, we wished to compare the use of GCMS and NMR metabolomic methods for the analysis of eleven kānuka essential oils, and to apply statistical tools to evaluate how well the data sets corresponded. The main compounds detected were α-pinene (35-59%), p-cymene (0.1-19%), γ-terpinene (not detected-12%), α-terpinolene (0.1-4%), linalool (1-5%), limonene (2-3%), eucalyptol (0.1-7%) and sesquiterpenoid viridiflorol (2-9%). Use of Procrustes analysis to compare the analytical data obtained from a pilot study using both GCMS and NMR metabolomic profiling indicated a high level of correlation between the data sets, suggesting either approach is suitable for analysis of kānuka essential oils in an unbiased fashion. In addition, we also report on the absolute configuration of the major component of the essential oil, (+)-D-α-pinene.
Published by Elsevier Ltd on behalf of Phytochemical Society of Europe
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