Reza Dehghani Bidgoli

In this study, we investigated the chemical composition, the antibacterial activity, and the antioxidant properties of extracts obtained from the leaves, flowers, and fruits of Eucalyptus largiflorens F. Muell. The antioxidant effects of the methanolic extract of aerial parts of the plant, obtained by Soxhlet apparatus, were estimated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and β-carotene/linoleic acid methods. The essential oils were chemically characterized by gas chromatography (GC) coupled with mass spectrometry (MS) and flame ionization detector (FID). Thirty compounds were identified, with 1,8-cineol, α-pinene, aromadendrene, globulol and α-phellandrene being the major components. The antibacterial activities of the essential oils were tested against several bacterial isolates, including Staphylococcus aureus, Staphylococcus epidermidis and Escherichia Coli, using the disc diffusion method. All the essential oils exhibited antibacterial activity. The maximum zone of inhibition was observed for Escherichia coli, with the fruit essential oil in the concentration (100 μL). There was no significant antioxidant activity in the essential oils, while the extracts exhibited considerable antioxidant effects in comparison to butylated hydroxytoluene (BHT). In this regard, the flower extract showed the highest antioxidant activity in both DPPH (IC50 = 21.5±0.2 μg/mL) and β-carotene/linoleic acid tests (Inhibition (%) = 84.3±0.7). Finally, the fruit essential oil exerts a significant antibacterial activity against several bacterial strains and exhibits a significant antioxidant effect in the β-carotene/linoleic acid tests, thus it may represent an innovative nutraceutical tool able to act on bacteria and host oxidative stress related to infections.

Background Ballota nigra L. is a perennial herb of the Lamiaceae family and it's native to the Mediterranean region and central Asia, also it can found throughout Europe. during this research, the volatile oil composition and antimicrobial activity of the methanol extract from flowering aerial parts of two subspecies of B. nigra (B. nigra ssp. foetida and B. nigra ssp. anatolica) were evaluated. Plant extraction was prepared by the maceration method and the antibacterial activity of methanolic extracts against 12 microorganisms was investigated by disc diffusion and minimal inhibitory concentration (MIC) methods.Results: GC/MS analysis of the volatile oil confirms the presence of 25 constituents in B. nigra ssp. foetida and 27 constituents in B. nigra ssp. anatolica. the most constituents in these two subspecies were α- Terpineol, Eicosane, Hexadecanoic acid, Longipinene epoxide, and Ethyl linoleate, which had slight differences within the amount of total volatile oil. within the antibacterial and MIC tests, indicated that methanolic extract of two subspecies Ballota nigra L. had acceptable antibacterial activity and therefore the B. nigra ssp. anatolica had more antibacterial activity in compression to B. nigra ssp. foetida.Conclusion: Today the tendency of natural products due to antioxidant and antimicrobial properties is increasing, and plants are the main source of these safe materials. During this respect, our study is often considered because of the first report on the volatile oil composition and antimicrobial activity of methanol extract of various subspecies of .B. nigra.

Artemisia is the largest and most diverse genus from the Asteraceae family that named locally "Dermaneh" in Iran. This study was conducted to determine, the chemical compounds of Artemisia persica Boiss essential oil and its antifungal effect, toward six toxigenic fungal strains in vitro. The yield of essential oil from the aerial parts of this plant species, using hydrodistillation method obtained 0.18% (v/w). The results of GC/MS analysis identified 31 components in the essential oil that laciniata furanone E (17.1%), artedouglasia oxide C (13.2%), Trans-pinocarveol (10.2%), pinocarvone (8.5%), and α-pinene (5.8%) were the major compounds. The results of the antifungal activity showed that the most sensitive fungal strains to A. persica Boiss. essential oil were Aspergillus ochraceus and Aspergillus parasiticus with lower minimal fungicidal concentration (MFC) of 1.25 μl/ml (v/v). Also the strong fungicidal effect was observed against Aspergillus flavus and Aspergillus nidulans at a MFC value of 2.5 μl/ml, while the fungicidal activity against Aspergillus fumigatus and Aspergillus niger observed in the 10 μl/ml oil concentration. According to the results A. persica Boiss essential oil has a acceptable antifungal activity against Aspergillus strains and can be used to prevent food crops from fungal contaminations.

Background: Environmental factors and biological regulators have effects on plants morpho-physiological and phytochemical charecteristics. Objective: The aim of this study was to investigate the growth and yield of Rosmarinus officinalis in coexistence with plant growth-promoting rhizobacteria (PGPR) under purified urban wastewater. Method: This study was done in research greenhouse of ...

Bidgoli RD. 2019. Effect of inoculation of two Aztobacter and nitrogen fertilizer on of peppermint (Mentha piperita) essential oil. Asian J Agric 3: 22-25. This study was conducted to study changes of percentage and yield of essential oil of peppermint (Mentha piperita) as a split factorial in a randomized complete block design (RCBD) with three replications in 2016-2017. The experimental treatments were nitrogen at four levels 0, 50, 100 and 150 kg/ha as the main factor and two strains of PGPR (Aztobacter chroococcum MZ11, MZ26) in two state of (use and non-use) was considered as sub factors. Results showed that use of these two of A. chroococcum strains has led to increase in the percentage and yield of peppermint essential oil more than all Nitrogen fertilizer treatments. Also, the highest peppermint essential oil percentage (0.73%) obtained the in the of triple interaction of Nitrogen (100 kg/ha) A. chroococcum MZ11 and A. chroococcum MZ26 The highest essential oil yield (91.65 kg/ha)observed under the influence of the triple interaction of Nitrogen (100 kg/ha) , A. chroococcum MZ11 and A. chroococcum MZ26.