Erich V. Lassak

Triterpenoid saponins from leaves of Pittosporum undulatum

Abstract Three triterpenoid sapogenins were obtained on enzymatic hydrolysis of a saponin fraction from the leaves of Pittosporum undulatum . On the basis of

Leaf wax constituents of some myrtaceous species

Abstract Eucalyptin and 8-desmethyleucalyptin have been isolated from the leaf wax coatings of several species of Eucalyptus, from Syncarpia glomulifera, Lophostemon confertus and an Angophora hybrid indicating that C-methylated flavones may be fairly distinctive of the family Myrtaceae. Ursolic acid has been isolated from the leaf waxes of E. youmanii, S. glomulifera, Leptospermum petersonii and Melaleuca quinquenervia, friedelin from Lophostemon confertus and 4,6-dimethoxy-2-hydroxyacetophenone from E. michaeliana.

Constituents of Santalum spicatum (R.Br.) A. DC. Wood Oil

ABSTRACT The chemical composition of the steam-distilled wood oil of Santalum spicatum was investigated by means of GC/MS. The major constituents of the entirely sesquiterpenoid oil were trans, trans-farnesol (31.6%), epi-α-bisabolol (anymol) (10.7%), α-santalol (9.1%), Z-nuciferol (6.5%), cis-β-santalol (5.4%), cis-lanceol (3.9%) and epi-β-santalol (2.9%).

Volatile leaf oils of Eucalyptus delegatensis seedlings

Abstract A study of the volatile leaf oils of Eucalyptus delegatensis seedlings with respect to the geographic provenance of the parent seed has shown that oils of mainland Australian origin contained significantly higher proportions of 4-phenylbutan- 2-one than oils of Tasmanian origin.

The steam volatile leaf oils of some species of Eucalyptus subseries Strictinae

Abstract The volatile leaf oils of Eucalyptus stenostoma , E. fraxinoides , E. triflora , E. dendromorpha , E. burgessiana , E. rupicola , E. approximans subsp. approximans , E. approximans subsp. codonocarpa and E. paliformis were qualitatively very similar to each other but significantly different from the leaf oils of the remaining species of the subseries. Their leaf oils were characterized by high concentrations of p -cymene and by the presence of α- and β-phellandrene, variable amounts of piperitone, trans - and cis -piperitol and trans - and cis - p -menth- 2-en-1-ol. The three last named alcohols have not been previously reported from the Myrtaceae.

Steam Volatile Leaf Oil of Callistemon linearis (Schrader et Wendl.) Sweet

ABSTRACT The volatile leaf oil of Callistemon linearis (Schrader et Wendl.) Sweet (Myrtaceae) is predominantly monoterpenoid in character with 1,8-cineole accounting for 64% of the oil. Sesquiterpenoids make up less than 3% of the oil, spathulenol being the only significant one at 1.5% of the oil. A comparison of the chemistry of the volatile oils of Callistemon and of the closely related genus Melaleuca shows that the latter is the more varied one of the two, although Callistemon oils in general resemble 1,8-cineole-rich Melaleuca oils.

The Essential Oils of the Genus Doryphora

ABSTRACT The essential oils of two species within the genus Doryphora have been examined. The principal components of both the leaf oil and bark oil of D. sassafras Endl. were methyl eugenol (27–47%), safrole (15–30%) and camphor (15–19%). The oil obtained from the seed of this species had a similar composition. The leaf essential oil of D. aromatica (F. M. Bail.) L. S. Smith did not contain any aromatic compounds; its major components were sesquiterpene alcohols, with the principal members being α-, β- and γ-eudesmol, spathulenql, elemol and guaiol each in approximately 5–15% amounts.

Leaf Essential Oils of Some Leptospermum (Myrtaceae) Species from Southern and Western Australia

Abstract The oils of Leptospermum coriaceum (F. Muell. Ex Miq.) Cheel, L. fastigiatum S. Moore, and L. nitens Turcz. were analyzed by GC and GC/MS. The oil of L. coriaceum contained α-pinene (25.4%), 1,8-cineole (11.5%) and globulol (15.4%) as major components, whereas L. fastigiatum and L. nitens oils were found to contain 82.8% and 64.8–70.6% α-pinene, respectively.

Camphor in commercial and potentially commercial oils of Eucalyptus species and other Myrtaceae.

Abstract Analysis of a variety of Eucalyptus species shows that the concentration of camphor typically lies below 60 ppm; for commonly traded oils, this figure can be halved. These values are at odds with the current British and European Pharmacopoeia values of up to 0.1% (1000 ppm).

The Steam-Volatile Oil of Commercial “Almaciga” Resin (Agathis philippinensis Warb.) from the Philippines

Abstract Water distillation of the resinous exudate of Agathis philippinensis Warb. known as Almaciga resin as well as Manila copal, yielded an essential oil rich in limonene (72 %). Minor constituents, present in amounts greater than 1 % included α-pinene, p-cymene, terpinen-4-ol and α-terpineol. Recent views on the synonymy of species from which Almaciga resin (Manila copal) is obtained are included.