Showing 4 results for Antimicrobial
Ali Dehghan Kashani, Iraj Rasooli, Mohammad Bagher Rezaee, Parviz Owlia,
Volume 5, Issue 12 (9-2011)
Abstract
Background: Rosa damascena is a traditional medicinal plant used in Asia to treat several ailments. This study reports In vitro and In vivo antioxidative properties and toxicity of methanolic and aqueous extracts of white rose, an indigenous variety of Rosa damascena from Iran.
Methods: The antimicrobial activities, total phenolics, antioxidative properties and the blood sera Ferric-Reducing Antioxidant Power (FRAP) of the extracts were determined using standard methods. Acute and subchronic toxicity and cytotoxicity of the extracts were tested. Hematology and clinical chemistry parameters were investigated.
Results: S.aureus only was susceptible. The total phenol contents of the methanolic and aqueous extracts were 137.67±9.50 and 138.67±5.69 μg Gallic acid equivalent/mg sample respectively. DPPH scavenging and lipid peroxidation inhibition effects were higher than those of the synthetic antioxidants. A dose dependent FRAP was noted in blood sera of rats fed with the extracts. Cholesterol/HDL and LDL/HDL ratios, fasting glucose, blood urea nitrogen, creatinine and uric acid levels decreased. IC50 of 4.5 µg/ml was determined for cytotoxicity of the extract against Hela cell line.
Conclusion: Antioxidative activity and cytotoxicity of white rose suggests its promising applications as a natural antioxidant and health promoting agent for the treatment and prevention of free radicals associated diseases.
Maryam Kouhkan, Ali Souldozi, Reza Talebi ,
Volume 12, Issue 1 (1-2018)
Abstract
Background: In this study, we evaluated antibacterial and antifungle activity of these derivatives against gram positive (Staphylococcus aureus, Bacillus subtilis, B. cereus), gram negative (Proteus vulgaris) bacteria and fungale (Candida albicans, C. tropicalis and C. glabrata).
Methods: The broth macro dilution and well agar diffusion methods were used for determination of inhibition zoom (IZ) and minimum inhibitory concentration (MIC) during preliminary evaluation of antimicrobial activity.
Results: The (MIC) values of tested compounds revealed that all compounds were active against Staphylococcus oureus and exhibited the same antibacterial activity in comparison to ceftizoxim (MIC=125µg/mL). The results of antifungal screening showed that all the compounds were potent antimicrobial activity against tested pathogenic fungi (MIC=250 to1000 µg/ml). Compounds (6a) and (6b) showed the maximum activity with MIC value of 250 µg/ml against all tested fungi, but compound (6h) showed poor antifungal activity against all fungi. MIC values for title compounds were similar to MIC results for fluconazol.
Conclusions: All the compounds are potent antifungal and antibacterial activity against tested microorganism.
Hani Keshavarz Alikhani, Jamil Zargan, Ali Bidmeshkipour, Ashkan Haji Nour Mohammadi, Mohammad Hosseinpour, Ahmad Heydari, Abbas Hajizadeh,
Volume 14, Issue 2 (5-2020)
Abstract
Background: The venoms of some scorpions are rich in bioactive components that may be used in the development and discovery of new antibacterial drugs. The venoms have many components, such as neurotoxins, salts, proteins and peptides with therapeutic properties, and can rapidly eliminate a broad range of bacteria. This study evaluated the anti-bacterial activity of Odontobuthus bidentatus’ crude venom against typical Gram-positive and negative bacteria, such as Staphylococcus aureus, Bacillus subtilis, and Escherichia coli.
Methods: The antibacterial effects of the crude venom were evaluated using Minimal Inhibitory Concentration (MIC) and MTT assays and its IC50 value was determined, using GraphPad software.
Results: The crude venom significantly inhibited the growth of both Gram-positive and negative bacteria. Also the MTT results showed that the crude venom significantly reduced the viability of E. Coli, S. Aureus, and B. Subtilis bacteria compared with that for the controls. The IC50 values of the venom for E.coli, S.aureus, and B.subtilis were 30.19, 17.64, and 24.13 µM, respectively.
Conclusion: The findings suggest that the venom of O. bidentatus scorpion has antibacterial properties. Also, our results offer preliminary clues toward the development of new antibacterial agents and new drugs with high therapeutic potentials for use in animals and humans.
Mahboobeh Talebi Mehrdar,
Volume 14, Issue 3 (7-2020)
Abstract
Background: Antibacterial proteins are widely expressed in snake venoms. Previously, we have isolated two immunodominant proteins with molecular weights of 14 and 65 kD from the snake venom of Naja naja oxiana (N. oxiana). It was demonstrated that they had potent inhibitory effects against gram-positive bacteria, S. aureus and B. subtilis but were less effective against gram-negative bacteria, such as E. coli and P. aeruginosa. This study aimed at investigating the potential antibacterial effects of the two proteins against Bacillus anthracis and Streptococcus pneumoniae.
Methods: The proteins were identified by SDS-PAGE and western blot analysis, and isolated by Gel Electrophoresis (Electro-elution). The antibacterial effects were tested against the strains of Bacillus anthracis and Streptococcus pneumoniae, using broth microdilution and disc-diffusion assays. For comparison, the antibacterial effects of standard antibiotics, such as Gentamicin, Ampicillin, Penicillin, Amoxicillin and Ciprofloxacin were also tested on the same B. anthracis and S. pneumoniae batches under identical laboratory conditions.
Results: The two proteins showed high immunogenicity and strongly inhibited the growth of gram-positive bacteria, B. anthracis, and to a lesser extent S. pneumoniae.
Conclusion: The isolated proteins demonstrated strong antibacterial effects against Gram-positive bacteria, B. anthracis and S. pneumoniae, in addition to their previously known effects against S. aureus and B. subtilis.
