Leaf essential oils of the genusLeptospermum (Myrtaceae) in eastern Australia. Part 3.Leptospermum arachnoides and allies

Abstract

Fifteen related species of Leptospermum (L. arachnoides, L. crassifolium, L. deuense, L. epacridoideum, L. glabrescens, L. grandifolium, L. lanigerum, L. macrocarpum, L. nitidum, L. petraeum, L. riparium, L. spectabile, L. sphaerocarpum, L. thompsonii, L. turbinatum) yielded essential oils in which α‐, β‐ and γ‐eudesmol were usually the prominent components. Only the oils of L. deuense and L. turbinatum contained α‐pinene at >30%, while 1,8‐cineole was present at >10% only in the oils of L. glabrescens, L. spectabile and L. turbinatum. The two β‐triketones, flavesone and leptospermone, were found in the oil of L. glabrescens in amounts of 1% and 28%, respectively. Copyright © 1999 John Wiley & Sons, Ltd.

Essential oils from Leptospermums of the Sunshine Coast and Northern Rivers Regions

“…The genus wide prevalence of bicyclogermacrene observed in previous studies of Australian Leptospermum species was not seen in this study [ 1 - 5 , 15 , 16 ]. In fact bicyclogermacrene was not identified as a component in any Sunshine Coast and Northern Rivers Region Leptospermum species.…”

“…In fact bicyclogermacrene was not identified as a component in any Sunshine Coast and Northern Rivers Region Leptospermum species. The genus wide prevalence of α-himachalene and β-selinene observed in this study of Sunshine Coast and Northern Rivers Region Leptospermum species was not seen in prior work of Australian Leptospermum species and α-himachalene and β-selinene were observed in significantly smaller amounts in these previous studies [ 1 - 5 , 15 , 16 ]. α-pinene was observed in significantly higher proportions in the current work on L. laevigatum, L. liversidgei chemotypes I and II than in previous studies [ 2 , 3 ].…”

Rise of the killer plants: investigating the antimicrobial activity of Australian plants to enhance biofilter-mediated pathogen removal

“…Also of interest was the high activity demonstrated by L. lanigerum (8 mg/mL, [4–16 mg/mL]). To our knowledge, no previous studies have characterised the antimicrobial activity of this species, notwithstanding biochemical profiles demonstrating significant levels of antimicrobial-associated secondary metabolites [101]. These include the monoterpenoids α-pinene (0.5–20% oil content), β-pinene (1–21%) [102], 1,8-cineole (3–7%) [103], linalool (0.4–3%) and α-terpineol (2–3%) [104], in addition to the sesquiterpenes β-caryophyllene (13 ± 57%) [105] and humulene (2 ± 22%) [106].…”

A Comprehensive Review of the Botany, Bioactive Compounds and Health Benefits of Leptospermum

“…However, the composition of these triketones varies depending on the species. For example, L. scoparium essential oil has approximately 32% of leptospermone [22], whereas L. glabrescens essential oil only contains 28% of this aromatic compound [33]. Leptospermone is reported to exhibit antibacterial activity, mainly Gram-positive bacteria [24].…”