Shahram Nazari; Sosan Bagheri; Lila Mohammadi; Gharib Majidi; Payman Azghani; Zohreh Darkhosh; Zohreh Nazari; Soudabeh Alizadeh Matboo
Volume 24, Issue 6 , March and April 2018, , Pages 112-120
Abstract
Background & Objectives: This study aimed to examine the antibacterial effect of Nano Polyamidoamine-G5 (NPAMAM-G5) dendrimer on Escherichia Coli, Proteus Mirabilis, Salmonella Typhi, Bacillus Subtilis and Staphylococcus Aureus isolated from the hospital environment. Materials & Methods:In this ...
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Background & Objectives: This study aimed to examine the antibacterial effect of Nano Polyamidoamine-G5 (NPAMAM-G5) dendrimer on Escherichia Coli, Proteus Mirabilis, Salmonella Typhi, Bacillus Subtilis and Staphylococcus Aureus isolated from the hospital environment. Materials & Methods:In this study, the antibacterial effects of NPAMAM-G5 dendrimer were studied by disc diffusion and micro-dilution method. Different concentrations of Polyamidoamine-G5 inoculated onto blank disks and were placed in Mueller-Hinton agar media. Zone of inhibition was investigated by bacterial inoculation according to the McFarland standard 0.5. Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of NPAMAM-G5 dendrimer were determined by micro-dilution method. Results: Zone of inhibition in Polyamidoamine-G5 dendrimers concentration of 25 μg/mL for Escherichia Coli, Proteus Mirabilis, Salmonella Typhi, Bacillus Subtilis and Staphylococcus Aureus were 22, 28, 21, 16 and 20 mm, respectively. Regarding the zone of inhibition in gram negative bacteria with gram positive ones was p=0.16 and was not significant different. The minimum inhibitory concentration for both Proteus Mirabilis and Salmonella Typhi was 2.5 μg/mL and for Escherichia Coli, Bacillus Subtilis and Staphylococcus Aureus was 25 μg/mL. The Minimum Bactericidal Concentration (MBC) for Salmonella Typhi was 50 μg/mL and for all Proteus Mirabilis, Escherichia Coli, Bacillus Subtilis and Staphylococcus Aureus was 100 μg/mL. Conclusion: According to the results, NPAMAM-G5 dendrimer can effectively eliminate Escherichia Coli, Proteus Mirabilis, Salmonella Typhi, Bacillus Subtilis and Staphylococcus Aureus.
Zahra Rezaei Gozal Abad; Ahmad Alah Abadi; Ahmad Hosseini-Bandegharaei; Ayoob Rastegar; Farzad Mohammadi; Shahram Nazari
Volume 23, Issue 4 , September and October 2016, , Pages 608-617
Abstract
Objectives Phenol is known as a toxic and carcinogen compound in the environment. It also produces unpleasant taste and odor in water reservoirs. In this study, the efficiencies of modified and conventional rice husk ashes as low-cost adsorbents were compared regarding phenol removal from aqueous solutions. ...
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Objectives Phenol is known as a toxic and carcinogen compound in the environment. It also produces unpleasant taste and odor in water reservoirs. In this study, the efficiencies of modified and conventional rice husk ashes as low-cost adsorbents were compared regarding phenol removal from aqueous solutions. Methods This study is an interventional laboratory research in which, at first carbonized rice husk was prepared at a temperature of 450°C. Then, to improve rice husk ash adsorption capacity, NH4CL was used for its modification. Then, the effects of physiochemical factors (pH, contact time, phenol concentration and adsorbent dose) on phenol removal were studied. Results Findings showed that the phenol removal by modified and conventional rice husk ash was 94.85% and 52.8%, respectively. The adsorption process for both adsorbents followed Freundlich isotherm (R2≥ 0. 99) and the pseudo-second order model (R2>0.99). Maximum adsorption capacity based on Langmuir model for the modified and conventional husk rice ashes were 66.6 mg/g and 4.7 mg/g, respectively. Conclusion Results indicated that efficiency of modified husk rice ash was more than that of the conventional type in phenol removal, causing less adsorbent consuming in the industrial treatment plants. Therefore, because of its availability and easy modification, it can be used in water and wastewater technology for phenol removal.