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Title: Chemical characterisation and antimicrobial capacity of essential oils from 'Eremophila longifolia' (F. Muell) (Myoporaceae): an indigenous Australian medicinal plant with high geographic chemovariability
Contributor(s): Sadgrove, Nicholas (author); Smith, Joshua Eachan (author); Alter, Daniel  (author); Watson, Kenneth  (author); Tucker, David  (author); Jones, Graham L  (author)orcid 
Publication Date: 2009
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Abstract: Essential oils from the Australian Aboriginal medicinal plant 'Eremophila longifolia' (emu bush) were characterised using GC/MS and NMR, and antimicrobial capacity investigated using disc diffusion and broth dilution. Leaves were collected from various locations within New South Wales (NSW, Australia) and hydro-distilled for volatile leaf oils. Overall yield and oil constitution differed markedly according to the geographical region from which the plants were collected. 'E. longifolia' demonstrated a variety of chemotypes not yet recognised. Four further chemotypes are now recognised within NSW, in addition to the two previously characterised from other regions of Australia; the Northern Territory (NT) and the Murchison district in Western Australia (WA). Characterisation of NSW chemotypes revealed that here 'E. longifolia' does not produce the carcinogenic volatile compound, safrole, as previously described in the leaf oil from Murchison specimens (WA). Two separate chemotypes within NSW yielded oil as high as 7% w/w and 3.5% w/w consisting mostly of iso-menthone (70-90%) and karahanaenone (≈80%) respectively; marking these as the most abundant natural sources of these compounds so far described [3,4,5]. The two remaining chemotypes had a much lower yield, 0.2 and 0.7%, and were more similar to the chemotype found in the NT; leaf oils consisting of limonene (≈20%) and borneol (20-30%) respectively. Antimicrobial assays of volatile oils from the four chemotypes revealed a moderate to high antimicrobial capacity, varying with species and chemotype. Traditional (location specific) indigenous applications of the oils are consistent with these results. The essential oil from 'E. longifolia' may thus be a likely candidate for further investigation into cosmeceutical use addressing a similar market niche to that already successfully occupied by the essential oil of 'Melaleuca alternifolia' (tea tree oil) and more recently 'Backhousia citriodora' (lemon myrtle oil). Further investigations (wound healing, anti-inflammatory and cultivar chemotype requirements) are in progress.
Publication Type: Conference Publication
Conference Details: ISEO 2009: 40th International Symposium on Essential Oils, Savigliano, Italy, 6th - 9th September, 2009
Source of Publication: 40th International Symposium on Essential Oils (ISEO) Programme and Book of Abstracts, p. 43-43
Publisher: University of Turin
Place of Publication: Turin, Italy
Fields of Research (FoR) 2008: 030599 Organic Chemistry not elsewhere classified
Socio-Economic Objective (SEO) 2008: 920301 Aboriginal and Torres Strait Islander Health - Determinants of Health
HERDC Category Description: E3 Extract of Scholarly Conference Publication
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Appears in Collections:Conference Publication
School of Environmental and Rural Science

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