Ravindra Ashok Sharma; Prajakta Kashinath Jagtap
Abstract
Recently, there has been an increase in research interest in metal nanoparticles and their synthesis because of their various applications in different industrial areas. The current study deals with the Actinomycetes-mediated synthesis of copper nanoparticles (CuNPs) isolated from mangrove soil and to ...
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Recently, there has been an increase in research interest in metal nanoparticles and their synthesis because of their various applications in different industrial areas. The current study deals with the Actinomycetes-mediated synthesis of copper nanoparticles (CuNPs) isolated from mangrove soil and to further access its application in different fields. Eight different soil samples were collected from three different mangrove sites located in Mumbai. A total of 15 different Actinomycetes isolates were obtained from soil samples and studied in the present investigation and were screened for metal tolerance. It was found that out of 15 isolates, only 3 were able to tolerate the highest metal salt concentration i.e. 10-1M. The synthesized CuNPs were further investigated with various characterizations such as UV-Vis spectroscopy, FTIR, and XRD. The identification of isolate GRC1 was done as per Bergey’s Manual of Systematic Bacteriology Volume 5 for preliminary identification of Actinomycetes and was identified as Streptomyces sp. This isolate was further characterized by Vitek MS and it was identified as Streptomyces verticillus. The inhibition zone by biosynthesized CuNPs was significantly greater when compared with standard antibiotics and CuSO4. The calculated degradation efficiency after 5hrs of incubation was 59.67% and 96.26% for Red M8B and Reactive green, respectively. Prevention of biofilm formation by CuNPs was confirmed by microscopic technique and significant inhibition of biofilm was observed. Thus, the mangrove Actinomycetes mediated bio-fabrication of CuNPs should gain much attention because of their unique properties like antimicrobial, anticancer, catalytic activity, wound healing, and antifouling.
Mahdi Seyfollahi; Habib Etemadi; Reza Yegani; Mahyar Rabeii; Elham Shokri
Abstract
In this study, membranes were prepared by pristine and polyethylene glycol (PEG)-grafted nanodiamond (ND) embedded in cellulose acetate (CA) as matrix polymer via non-solvent induced phase separation method. The antifouling properties of the membranes were studied during filtration of ...
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In this study, membranes were prepared by pristine and polyethylene glycol (PEG)-grafted nanodiamond (ND) embedded in cellulose acetate (CA) as matrix polymer via non-solvent induced phase separation method. The antifouling properties of the membranes were studied during filtration of bovine serum albumin (BSA) solutions and the governing fouling mechanisms of the membranes were also investigated using the Hermia model. Fourier Transform Infrared Spectroscopy (FTIR) and Thermal gravimetric analysis (TGA) confirmed that ND was successfully functionalized by PEG. CA/ND-PEG nanocomposite membranes have higher hydrophilicity, porosity, water uptake, mechanical strength and a lower amount of adsorbed protein than pure CA and CA/ND membranes. Besides, the antifouling performance of the CA/ND-PEG (0.5 wt.%) nanocomposite membrane also witnessed considerable improvement, in comparison with that of pure CA and CA/ND (0.5 wt.%) membranes. The obtained results showed that the best fit to experimental data for all membranes (pure and nanocomposite membranes) corresponds to the cake layer formation model.