Oil Ginger-grass

Tho known constituents of ginger grass oil are the terpenes, diuen-tane, d-a-phellandreoo and rf-limonene, together with geraniol, ana an alonboJ which is identical with that obtained by the reduction of porUlio aldehyde, and which is known as perillic alcohol. 

Geraniol, Cj(,Hj-OH, is a constituent of many essential oils, both in the free state and in the form of esters. It is present to a very large extent in palmarosa oil, ginger-grass oil, and citronella oil, principally in the free state, and in geranium oil, to some extent in the free state, but principally in the form of esters. It is also an important constituent of otto of rose, and is present in numerous other oils belonging to the most distantly related groups. 

It was separated from geraniol, which accompanies it in ginger-grass oil by treatment with concentrated formic acid, which destroys the geraniol, but does not attack the perillic alcohol. It has the following characters —... 

Ginger-grass An East Indian grass (Cymbooogon flexuosus) which yields ginger-grass oil. 

Essential oils are isolated from various plant parts, such as leaves (patchouH), fmit (mandarin), bark (cinnamon), root (ginger), grass (citroneUa), wood (amyris), heartwood (cedar), gum (myrrh oil), balsam (tolu balsam oil), berries (pimento), seeds (diU), flowers (rose), twigs and leaves (thuja oil), and buds (cloves). 

Ginger grass or " Sofia grass oil diSerS in characters entirely from palmaroea or " Moiia " grass od. It has the following eharaclers —... 

An alcohol of the formula Cj Hj O was isolated from oil of ginger-grass by Schimmel Co., and described by them as dihydrocuminic alcohol. It has, however, now been shown by Semmler and Zaar not to have the constitution assigned to it by Schimmel Co., but to be identical with the alcohol obtained by reducing perillic aldehyde, Cj<,H 40, the aldehyde characteristic of the essential oil of PerUla nankinensis. 

Oil of yerl)enaj rose, geranitun, or ginger-grass 1 oa. 

The " Motia grass yields the important commercial oil, palmarosa oil, whilst the " Sofia grass yields the less valuable and quite different ginger-grQiSB oil. 

The goal of this work was studying of the antioxidant properties of the black pepper, ginger, cardamom, juniper, fennel, mace, lemon grass and caraway essential oils and comparison of antioxidant activity with essential oil composition and it s change during the process of autooxidation. 

Figure 1. Time of half-oxidation (THO) of trans-2-hexenal in various essential oils 1 - control, 2 -black pepper, 3 - berries of juniper, 4 - cardamom, 5 - seeds of caraway, 6 - fennel, 7 - lemon grass, 8 - ginger, 9 - mace Change of main component content in studied essential oils during autooxidation.

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