Eucalyptus polybractea

The main essential oil-producing species of Eucalyptus include Eucalyptus globulus, also called blue gum eucalyptus Eucalyptus dives, known as broadleaved peppermint eucalyptus Eucalyptus citriodora, known as lemon-scented eucalyptus Eucalyptus radiata, known as narrow-leaved peppermint gum Eucalyptus smithii, known as gully gum and Eucalyptus polybractea, known as blue mallee. Within each species there are many subspecies and chemo-types. This illustrates a very complex situation, producing essential oils with varying compositions and properties. 

The oil is produced from the leaves and twigs of Eucalyptus globulus Labillardiere [283-406-2 84625-32-1], Eucalyptus polybractea R. T. Baker [294-961-5 91771-67-4], Eucalyptus smithii R. T. Baker [294-962-0 91771-68-5] (Myrtaceae) by steam distillation. 

Miyazawa, M M. Shindo, and T. Shimada, 2001b, Oxidation of 1,8-cineole, the monoterpene cyclic ether originated from Eucalyptus polybractea, by cytochrome P450 3A enzymes in rat and human liver microsomes. Drug Metab. Dispos., 29 200-205. 

Definition Eucalyptus oil is obtained by steam distillation and recti cation of the fresh leaves or the fresh terminal branchlets of various species of Eucalyptus rich in 1,8 cineole. The spe cies mainly used are Eucalyptus globulus LabilL, Eucalyptus polybractea R.T. Baker, and Eucalyptus smithii R.T. Baker. 

A relatively new technique that saves time in loading and unloading of the biomass is the onsite or container distillation. The technique is very simple as the container that is used to pick up the biomass and transport it to the distillery serves itself as the still pot. The first plant crops treated in this way were peppermint and mint, clary sage, lavandin grosso, L. angustifolia. Eucalyptus polybractea, and tea tree. In its simplest form, the mobile still assembly is composed of the following components A tractor is coupled to an agricultural harvester that cuts the plant material and delivers it directly into the still pot (or vat) via a chute. The still pot (vat) is permanently fixed onto a trailer that is coupled to the harvester. Once the still pot is completely filled, it is towed by the tractor into the factory where it is uncoupled and attached to the steam supply and condenser and... 

Cineole, a monoterpene cyclic ether, is known to be a major flavor constituent of lime (Citrus aurantiifolia) and Eucalyptus polybractea has been used for many years as a fragrance and flavoring agent (Miyazawa et al., 2001a). Although there are no in vivo data about the metabolism of... 

Cineole, a monoterpene cyclic ether which is also named eucalyptol, is widely distributed in plants and is found in high concentrations in the essential oil of Eucalyptus polybractea. It is extensively used in cosmetics, for cough treatment, muscular pain, neurosis, rheumatism, asthma, and urinary stones (Wichtel, 2002). Using rat liver microsomes, 1,8-cineole is predominantly converted to 3-hydroxy-l,8-cineole, followed by 2- and then 9-hydroxycineole (Miyazawa et al., 2001b). As seen in Figure 8.7, in human liver microsomes, however, only the 2-hydroxy- and 3-hydroxy products... 

Santalum spicatum Prostanthem melissifolia Leptospermum petersonii Melaleuca alternifolia Agonisfragram Melaleuca ericifolia Melaleuca quinquenervia Eucalyptus citriodora Eucalyptus polybractea Eucalyptus staigeriana Eucalyptus radiata... 

For the oils tested against Culex quinquefasciatus, the MPTs ranged from 20 to 100 minutes with the longest, 100 minutes, provided by Corymbia citriodora, which was significantly (FIO, 32 = 4.46, p = 0.002) greater than Prostanthera melissifolia, Agonisfragrans, Eucalyptus polybractea. Eucalyptus radiata, Melaleuca ericifolia, Melaleuca quinquenervia, and Santalum spicatum. 

Eucalyptus Eucalyptus globulus E. smithii E. polybractea (Myrtaceae) fresh leaves... 

EUCALYPTUS OIL Eucalypti aetheroleum is obtained by steam distillation of fresh leaves (in practice whole twigs) of Eucalyptus /lobulus Labill. and other Eucalyptus species, such as E. fructicetorum F. von Muller (=E. polybractea RF. Baker), family Myrtaceae. The genus Eucalyptus belongs to the Australian flora, but now has a global distribution by... 

Production By steam distillation of leaves of Eucalyptus globulus (Spain, Portugal, China, Chile), E. smithii (South Africa), E. polybractea and E. radiata (Australia). The world-wide annual production is probably between 2000 and 30001. 

---