Abstract:
Essential oils of different medicinal and aromatic plants have been potential candidates as source
of food preservation, pharmaceuticals, alternative medicines and natural therapies in addition to
their pharmacological properties like hepatoprotective, carminative, anticarcinogenic and
antiviral effects.
In present study some selected plants from Pothohar plateau were collected and subjected to
essential oil extraction by hydrodistillation followed by assessment of their physical parameters
like color, specific gravity, % yield etc and their biological activities including antioxidant,
antimicrobial and cytotoxic attributes. The oils were then characterized by using GC and GC-MS
techniques to find the chemical constituents. Overall the examined oils exhibited good
antioxidant and antimicrobial behavior. To the best of our knowledge the essential oil of
Parthenium hysterophorus has never been reported with regard to its composition as well as
biological activities before present study. In general, Trachyspermum ammi and Cuminum
cyminum essential oils showed significant activity in most of the assays performed in this study.
Both showed remarkable potential for scavenging of DPPH free radical with IC50 values 2.61and
16.86 μg/mL, respectively and inhibited linoleic acid by 80.73 and 79.36% respectively. For T.
ammi most sensitive bacterium was Streptococcus mutans (Inhibition zone=19.7mm; MIC=1.41
mg/mL) and fungus was Ganoderma lucidum (Inhibition zone=17.0mm; MIC=1.72 mg/mL)
while for C. cyminum most sensitive bacterium was Bacillus subtilis (Inhibition zone=27.3mm;
MIC=1.10 mg/mL) and fungus was Ganoderma lucidum (Inhibition zone=27.0mm; MIC=1.40
mg/mL). Both T. ammi and C. cyminum exhibited minimum hemolysis of human erythrocytes
i.e. 7.98 and 4.51% respectively at 0.5 mg/mL concentration. GC-MS analysis revealed that
thymol (37.75%) was the major component of T. ammi essential oil while cumaldehyde
(24.10%) in C. cyminum essential oil. All the experiments were done in triplicate and mean ±
S.D. was calculated.
