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Pascu B, Negrea A, Ciopec M, Duteanu N, Negrea P, Nemeş NS, Seiman C, Marian E, Micle O. A Green, Simple and Facile Way to Synthesize Silver Nanoparticles Using Soluble Starch. pH Studies and Antimicrobial Applications. MATERIALS 2021; 14:ma14164765. [PMID: 34443288 PMCID: PMC8399506 DOI: 10.3390/ma14164765] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/15/2021] [Accepted: 08/17/2021] [Indexed: 11/25/2022]
Abstract
Along with the progress of nanoscience and nanotechnology came the means to synthesize nanometric scale materials. While changing their physical and chemical properties, they implicitly changed their application area. The aim of this paper was the synthesis of colloidal silver nanoparticles (Ag-NPs by ultrasonic disruption), using soluble starch as a reducing agent and further as a stabilizing agent for produced Ag-NPs. In this context, an important parameter for Ag-NPs preparation is the pH, which can determine the particle size and stability. The physical-chemical behavior of the synthesized Ag-NPs (shape, size, dispersion, electric charge) is strongly influenced by the pH value (experiment being conducted for pH values in the range between 8 and 13). The presence of a peak located at 412 nm into the UV-VIS spectra demonstrates the presence of silver nano-spheres into the produced material. In UV/VIS spectra, we observed a specific peak for yellow silver nano-spheres located at 412 nm. Samples characterization was performed by scanning electron microscopy, SEM, energy-dispersive X-ray spectroscopy, EDX, Fourier-transform infrared spectroscopy, and FT-IR. For all Ag-NP samples, we determined the zeta and observed that the Ag-NP particles obtained at higher pH and have better stability. Due to the intrinsic therapeutic properties and broad antimicrobial spectrum, silver nanoparticles have opened new horizons and new approaches for the control of different types of infections and wound healing abilities. In this context, the present study also aims to confirm the antimicrobial effect of prepared Ag-NPs against several bacterial strains (indicator and clinically isolated strains). In this way, it was confirmed that the antimicrobial activity of synthesized Ag-NPs was good against Staphylococcus aureus (ATCC 25923 and S. aureus MSSA) and Escherichia coli (ATTC 25922 and clinically isolated strain). Based on this observation, we conclude that the prepared Ag-NPs can represent an alternative or auxiliary material used for controlling important nosocomial pathogens. The fungal reference strain Candida albicans was more sensitive at Ag-NPs actions (zone of inhibition = 20 mm) compared with the clinically isolated strain (zone of inhibition = 10 mm), which emphasizes the greater resistance of fungal strains at antimicrobial agent’s action.
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Affiliation(s)
- Bogdan Pascu
- Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 300006 Timisoara, Romania; (B.P.); (P.N.)
- Renewable Energy Research Institute, Politehnica University of Timisoara, 300501 Timişoara, Romania
| | - Adina Negrea
- Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 300006 Timisoara, Romania; (B.P.); (P.N.)
- Correspondence: (A.N.); (M.C.); (N.D.); (N.S.N.)
| | - Mihaela Ciopec
- Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 300006 Timisoara, Romania; (B.P.); (P.N.)
- Correspondence: (A.N.); (M.C.); (N.D.); (N.S.N.)
| | - Narcis Duteanu
- Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 300006 Timisoara, Romania; (B.P.); (P.N.)
- Correspondence: (A.N.); (M.C.); (N.D.); (N.S.N.)
| | - Petru Negrea
- Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 300006 Timisoara, Romania; (B.P.); (P.N.)
| | - Nicoleta Sorina Nemeş
- Renewable Energy Research Institute, Politehnica University of Timisoara, 300501 Timişoara, Romania
- Correspondence: (A.N.); (M.C.); (N.D.); (N.S.N.)
| | - Corina Seiman
- Faculty of Chemistry, Biology, Geography, West University Timisoara, 300115 Timisoara, Romania;
| | - Eleonora Marian
- Faculty of Medicine and Pharmacy, University of Oradea, 410068 Oradea, Romania; (E.M.); (O.M.)
| | - Otilia Micle
- Faculty of Medicine and Pharmacy, University of Oradea, 410068 Oradea, Romania; (E.M.); (O.M.)
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Ihegwuagu NE, Sha'Ato R, Tor-Anyiin TA, Nnamonu LA, Buekes P, Sone B, Maaza M. Facile formulation of starch–silver-nanoparticle encapsulated dichlorvos and chlorpyrifos for enhanced insecticide delivery. NEW J CHEM 2016. [DOI: 10.1039/c5nj01831e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The facile formulation of starch–silver nanoparticle encapsulated dichlorvos and chlorpyrifos, respectively, was explored in this study with the view to develop a safer and more economical insecticide delivery system.
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Affiliation(s)
- Nnemeka Edith Ihegwuagu
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology
- College of Graduate Studies
- University of South Africa
- Pretoria
- South Africa
| | - Rufus Sha'Ato
- Department of Chemistry & Centre for Agrochemical Technology
- University of Agriculture
- Makurdi
- Nigeria
| | - Terrumun Amom Tor-Anyiin
- Department of Chemistry & Centre for Agrochemical Technology
- University of Agriculture
- Makurdi
- Nigeria
| | - Lami Angela Nnamonu
- Department of Chemistry & Centre for Agrochemical Technology
- University of Agriculture
- Makurdi
- Nigeria
| | - Philip Buekes
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology
- College of Graduate Studies
- University of South Africa
- Pretoria
- South Africa
| | - Bertrand Sone
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology
- College of Graduate Studies
- University of South Africa
- Pretoria
- South Africa
| | - Malik Maaza
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology
- College of Graduate Studies
- University of South Africa
- Pretoria
- South Africa
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