الفهرس 
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Abstract
This study aims to evaluate the relationship between the soil chemical properties and associated species on essential oils and chemical compounds extracted from Deverra tortuosa in two types of Egyptian deserts (Coastal desert: West Alex and inland desert: Wadi Hagul).The results of this study showed that thirty seven species are recorded with D. tortuosa in both habitats of which thirty two are recorded in the coastal desert and fifteen species, soil chemical properties were generally higher in the coastal desert except pH and sulphates showed higher values in inland desert.
A comparative chemical profile study of the two localities essential oils (Coastal desert: West Alex and inland desert: Wadi Hagul) were performed using GC/MS analysis. GC/MS allowed the identification of forty compounds in both D. tortuosa essential oils (E.O Wadi Hagul and E.O West Alex.).The identified compounds were grouped into monoterpenes and sesquiterpenes.Thirty compounds were identified in the essential oil (E.O Wadi Hagul) representing 86.4 % of the total composition. Nineteen compounds were identified in the essential oil (E.O West Alex) representing 80.0 % of the total composition. The obtained results showed chemical variation between both D. tortuosa essential oil localities even with the presence of terpinen-4-ol (the major component of the both essential oil localities).
In this study, in Butanol Fraction three compounds (71,72 and 73) were reported from this plant species for the first time , Compound (71) is Luteolin 7-O-α-L-rhamnopyranoside , Compound (72) is Isorhamentin 3-O-rutinoside and Compound (73) is Luteolin 7-O-rutinoside.
All the obtained essential oils (E.O Wadi Hagul and E.O West Alex.), fractions and three isolated flavonoids were assessed for their antibacterial activity against (Streptococcus pyogenes, Staphylococcus aureus, Salmonella typhimurium, Escherichia coli and Klebsiella pneumonia).
On the basis of the antibacterial assay S. pyogenes was found the more susceptible to the employed D. tortuosa fractions and isolated compounds than S. aureus, S. typhimurium, E. coli and K. pneumoniae.
Briefly, this study has attempted to indicate the effect of soil chemical variables and climatic conditions on the composition of essential oils and isolated compounds from Deverra tortuosa in the coastal desert ( West Alex.) and inland desert (Wadi Hagul) in Egypt in addition to, in vitro antibacterial assessment for its all fractions and isolated compounds. The results contribute to improving the application of the plant as a source of essential oils.