Journal of Medicinal Plants Biotechnology

Abstract Due to the side effects of resulting from the consumption of chemical preservatives and also over increasing of bacterial resistance to the antibiotic, identification of natural origin antimicrobial compounds are very important. Therefore, the present study was performed to evaluate the antibacterial activity of aqueous and ethanolic extracts of Dorema aucheri, Zataria multiflora Boiss and Ferulago angulate.  The antimicrobial activity of extracts evaluated by Disc diffusion. The Minimum Inhibitory Concentrations (MIC) and Minimum Bactericidal Concentration (MBC) were determined by using the dilution method. The Z. multiflora Boiss extract had a strong antibacterial activity and stopped the growth of both Listeria monocytogenes and Staphylococcus  aureus in MIC  of  10 & 20 μg/ml in respectively. Also Dorema aucheri ethanolic extract had antimicrobial activity against Listeria monocytogenes at less concentration andalso it was effective on Escherichia coli in concentration of 40μg/ml. Moreover, Ferulago angulata ethanolic extract was effective on bacteria tested in concentration used. The highest diameter of inhibition zone was related to Dorema aucheri ethanolic extract on Listeria monocytogenes. According to the results, these extracts can be used as a potential sources of antibacterial compounds for food and pharmaceutical industries.

Abstract Marine macroalgae are a rich source of unsaturated fatty acids and compounds with inhibitory properties of
free radicals that contain numerous physiological effects that can be play an important role in human health.
In this study, the fatty acid composition, physicochemical properties, ability of free radicals scavenging and
sensitivity evaluation of Nizimuddinia zanardini (collected from the coast of Qeshm ) were conducted.
Assessment of physicochemical properties of N. zanardini was performed with measuring the water holding
capacity, swelling capacity, and oil holding capacity and identify the fatty acid composition was conducted by
using a gas chromatography. The inhibitory activity of extract algae, investigated by measuring the inhibitory
effect of DPPH and superoxide radicals. As well as to assess the odor and flavor indicators of aqueous extract
of seaweed, the 17 non-trained panels were used. Water holding capacity and swelling capacity of N. zanardini,
not showed statistically significant differences with increasing temperature (p>0.05). N. zanardini had the
content of 41.61% SFAs, 30.82% MUFAs and 7.52% PUFAs, respectively. Superoxide radical scavenging
(21/05%) was high but DPPH free radical scavenging activity (2/73%) in the studied macroalgae, was low.
The results of the sensitiviti evaluation showed that the studied macroalgae have an acceptable odor and flavor.
Based on our results, N. zanardini can be considered as a potential source of unsaturated fatty acids and
compounds with inhibitory properties of free radicals for using in food and medicine industries.