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Hamouda RA, Hussein MH, Abo-Elmagd RA, Bawazir SS. Synthesis and biological characterization of silver nanoparticles derived from the cyanobacterium Oscillatoria limnetica. Sci Rep 2019; 9:13071. [PMID: 31506473 PMCID: PMC6736842 DOI: 10.1038/s41598-019-49444-y] [Citation(s) in RCA: 271] [Impact Index Per Article: 54.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 08/09/2019] [Indexed: 12/13/2022] Open
Abstract
Using aqueous cyanobacterial extracts in the synthesis of silver nanoparticle is looked as green, ecofriendly, low priced biotechnology that gives advancement over both chemical and physical methods. In the current study, an aqueous extract of Oscillatoria limnetica fresh biomass was used for the green synthesis of Ag-NPs, since O. limnetica extract plays a dual part in both reducing and stabilizing Oscillatoria-silver nanoparticles (O-AgNPs). The UV-Visible absorption spectrum, Fourier transforms infrared (FT-IR), transmission electron microscopy (TEM) and scanning electron microscope (SEM) were achieved for confirming and characterizing the biosynthesized O-AgNPs. TEM images detected the quasi-spherical Ag-NPs shape with diverse size ranged within 3.30-17.97 nm. FT-IR analysis demonstrated the presence of free amino groups in addition to sulfur containing amino acid derivatives acting as stabilizing agents as well as the presence of either sulfur or phosphorus functional groups which possibly attaches silver. In this study, synthesized Ag-NPs exhibited strong antibacterial activity against multidrug-resistant bacteria (Escherichia coli and Bacillus cereus) as well as cytotoxic effects against both human breast (MCF-7) cell line giving IC50 (6.147 µg/ml) and human colon cancer (HCT-116) cell line giving IC50 (5.369 µg/ml). Hemolytic activity of Ag-NPs was investigated and confirmed as being non- toxic to human RBCs in low concentrations.
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Affiliation(s)
- Ragaa A Hamouda
- Department of biology, Faculty of sciences and Arts Khulais, University of Jeddah, Jeddah, Saudi Arabia.
- Department of Microbial Biotechnology, Genetic Engineering & Research Institute, Sadat University, Sadat city, Egypt.
| | - Mervat H Hussein
- Botany department, Faculty of science, Mansoura University, Mansoura, Egypt
| | - Rasha A Abo-Elmagd
- Botany department, Faculty of science, Mansoura University, Mansoura, Egypt
| | - Salwa S Bawazir
- Department of biology, Faculty of sciences and Arts Khulais, University of Jeddah, Jeddah, Saudi Arabia
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Milferstedt K, Kuo-Dahab WC, Butler CS, Hamelin J, Abouhend AS, Stauch-White K, McNair A, Watt C, Carbajal-González BI, Dolan S, Park C. The importance of filamentous cyanobacteria in the development of oxygenic photogranules. Sci Rep 2017; 7:17944. [PMID: 29263358 PMCID: PMC5738420 DOI: 10.1038/s41598-017-16614-9] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 11/15/2017] [Indexed: 11/09/2022] Open
Abstract
Microorganisms often respond to their environment by growing as densely packed communities in biofilms, flocs or granules. One major advantage of life in these aggregates is the retention of its community in an ecosystem despite flowing water. We describe here a novel type of granule dominated by filamentous and motile cyanobacteria of the order Oscillatoriales. These bacteria form a mat-like photoactive outer layer around an otherwise unconsolidated core. The spatial organization of the phototrophic layer resembles microbial mats growing on sediments but is spherical. We describe the production of these oxygenic photogranules under static batch conditions, as well as in turbulently mixed bioreactors. Photogranulation defies typically postulated requirements for granulation in biotechnology, i.e., the need for hydrodynamic shear and selective washout. Photogranulation as described here is a robust phenomenon with respect to inoculum characteristics and environmental parameters like carbon sources. A bioprocess using oxygenic photogranules is an attractive candidate for energy-positive wastewater treatment as it biologically couples CO2 and O2 fluxes. As a result, the external supply of oxygen may become obsolete and otherwise released CO2 is fixed by photosynthesis for the production of an organic-rich biofeedstock as a renewable energy source.
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Affiliation(s)
- Kim Milferstedt
- LBE, Univ Montpellier, INRA, 102 Avenue des étangs, 11100, Narbonne, France.
| | - W Camilla Kuo-Dahab
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Caitlyn S Butler
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Jérôme Hamelin
- LBE, Univ Montpellier, INRA, 102 Avenue des étangs, 11100, Narbonne, France
| | - Ahmed S Abouhend
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
- Marine Pollution Laboratory, National Institute of Oceanography and Fisheries, Hurghada, 84511, Egypt
| | - Kristie Stauch-White
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Adam McNair
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Christopher Watt
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | | | - Sona Dolan
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Chul Park
- LBE, Univ Montpellier, INRA, 102 Avenue des étangs, 11100, Narbonne, France.
- Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA.
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