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Șuică-Bunghez IR, Senin RM, Sorescu AA, Ganciarov M, Răut I, Firincă C, Constantin M, Gifu IC, Stoica R, Fierăscu I, Fierăscu RC. Application of Lavandula angustifolia Mill. Extracts for the Phytosynthesis of Silver Nanoparticles: Characterization and Biomedical Potential. PLANTS (BASEL, SWITZERLAND) 2024; 13:333. [PMID: 38337867 PMCID: PMC10857192 DOI: 10.3390/plants13030333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/17/2024] [Accepted: 01/21/2024] [Indexed: 02/12/2024]
Abstract
Nanotechnology can offer a series of new "green" and eco-friendly methods for developing different types of nanoparticles, among which the development of nanomaterials using plant extracts (phytosynthesis) represents one of the most promising areas of research. This present study details the use of lavender flowers (Lavandula angustifolia Mill., well-known for their use in homeopathic applications) for the biosynthesis of silver nanoparticles with enhanced antioxidant and antibacterial properties. Several qualitative and quantitative assays were carried out in order to offer an image of the extracts' composition (the recorded total phenolics content varied between 21.0 to 40.9 mg GAE (gallic acid equivalents)/g dry weight (d.w.), while the total flavonoids content ranged between 3.57 and 16.8 mg CE (catechin equivalents)/g d.w.), alongside modern analytical methods (such as gas chromatography-mass spectrometry-GC-MS, quantifying 12 phytoconstituents present in the extracts). The formation of silver nanoparticles (AgNPs) using lavender extract was studied by UV-Vis spectroscopy, Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and dynamic light scattering (DLS)/zeta potential, with the selected nanoparticles having crystallite sizes of approx. 14.55 nm (AgNP-L2) and 4.61 nm, respectively (for AgNP-L4), and hydrodynamic diameters of 392.4 nm (for AgNP-L2) and 391.6 nm (for AgNP-L4), determined by DLS. A zeta potential of around -6.4 mV was displayed for both samples while presenting as large aggregates, in which nanoparticle clusters with dimensions of around 130-200 nm can be observed. The biomedical applications of the extracts and the corresponding phytosynthesized nanoparticles were evaluated using antioxidant and antimicrobial assays. The obtained results confirmed the phytosynthesis of the silver nanoparticles using Lavandula angustifolia Mill. extracts, as well as their antioxidant and antimicrobial potential.
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Affiliation(s)
- Ioana Raluca Șuică-Bunghez
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Raluca Mădălina Senin
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Ana Alexandra Sorescu
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Mihaela Ganciarov
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Iuliana Răut
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Cristina Firincă
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
- Faculty of Biology, University of Bucharest, 91 Splaiul Independenței, 050104 Bucharest, Romania
| | - Mariana Constantin
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
- Faculty of Pharmacy, “Titu Maiorescu” University, 187 Calea Vacaresti, 040051 Bucharest, Romania
| | - Ioana Cătălina Gifu
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Rusăndica Stoica
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
| | - Irina Fierăscu
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Marasti Blvd., 011464 Bucharest, Romania
| | - Radu Claudiu Fierăscu
- The National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.R.Ș.-B.); (A.A.S.); (M.G.); (I.R.); (C.F.); (M.C.); (I.C.G.); (R.S.); (I.F.)
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gheorghe Polizu St., 011061 Bucharest, Romania
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Makky S, Rezk N, Abdelsattar AS, Hussein AH, Eid A, Essam K, Kamel AG, Fayez MS, Azzam M, Agwa MM, El-Shibiny A. Characterization of the biosynthesized Syzygium aromaticum-mediated silver nanoparticles and its antibacterial and antibiofilm activity in combination with bacteriophage. RESULTS IN CHEMISTRY 2023. [DOI: 10.1016/j.rechem.2022.100686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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Thermoplastic Starch Composites Reinforced with Functionalized POSS: Fabrication, Characterization, and Evolution of Mechanical, Thermal and Biological Activities. Antibiotics (Basel) 2022; 11:antibiotics11101425. [PMID: 36290082 PMCID: PMC9598116 DOI: 10.3390/antibiotics11101425] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/09/2022] [Accepted: 10/11/2022] [Indexed: 11/16/2022] Open
Abstract
Rapid advancements in materials that offer the appropriate mechanical strength, barrier, and antimicrobial activity for food packaging are still confronted with significant challenges. In this study, a modest, environmentally friendly method was used to synthesize functionalized octakis(3-chloropropyl)octasilsesquioxane [fn-POSS] nanofiller. Composite films compared to the neat thermoplastic starch (TS) film, show improved thermal and mechanical properties. Tensile strength results improved from 7.8 MPa to 28.1 MPa (TS + 5.0 wt.% fn-POSS) with fn-POSS loading (neat TS). The barrier characteristics of TS/fn-POSS composites were increased by fn-POSS by offering penetrant molecules with a twisting pathway. Also, the rates of O2 and H2O transmission were decreased by 50.0 cc/m2/day and 48.1 g/m2/day in TS/fn-POSS composites. Based on an examination of its antimicrobial activity, the fn-POSS blended TS (TSP-5.0) film exhibits a favorable zone of inhibition against the bacterial pathogenic Staphylococcus aureus and Escherichia coli. The TS/fn-POSS (TSP-5.0) film lost 78.4% of its weight after 28 days in natural soil. New plastic materials used for packaging, especially food packaging, are typically not biodegradable, so the TS composite with 5.0 wt.% fn-POSS is therefore of definite interest. The incorporation of fn-POSS with TS composites can improve their characteristics, boost the use of nanoparticles in food packaging, and promote studies on biodegradable composites.
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Antibacterial Activity of Silver Nanoparticles Synthesized by Aspergillus flavus and its Synergistic Effect with Antibiotics. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2022. [DOI: 10.22207/jpam.16.3.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Microbial antibiotic resistance is rapidly increasing as a result of overuse or misuse of antibiotics, as well as a lack of new, effective antibiotics. Alternative antimicrobial treatments, such as nanoparticles, and their potential for stronger synergetic effect when paired with other active chemicals, could be a viable option. This study is prepared to estimate the antibacterial activity of silver nanoparticles (AgNPs) that have been synthesized using the biomass-free filtrate of Aspergillus flavus. The formation of AgNPs was reported by color changed to a dark brownish-black after 72 hours of incubation. The AgNPs surface plasmon resonance peak was indicated in the UV–Vis spectrum at 427 nm. The synthesis of AgNPs with a nanoparticle size of 10 to 35 nm was validated using transmission electron microscopy. The increase in folding area was calculated to detect the synergistic potential of the combined AgNPs with a broad range of conventional antibiotics. AgNPs have broad-spectrum activity against all strains tested. The most sensitive strain was Escherichia coli (11 mm), whereas the most resistant strain was Pseudomonas aeruginosa, as indicated by the lowest inhibition zone (7 mm). The lowest Minimum Inhibitory Concentration indicated was against K. pneumonia and Enterobacter cloacae (0.025 mg/mL, each), followed by Staphylococcus epidermidis (0.05 mg/mL), E. coli and Shigella sp. (0.075 mg/mL, each), and then S. aureus (0.1 mg/mL). Notable synergy was reported between AgNPs and either ampicillin, erythromycin, ceftriaxone, vancomycin, azlocillin, or amoxicillin against S. aureus in the range between 29.3-fold to 8-fold. In addition, synergy was seen between AgNPs and either vancomycin, clindamycin, or erythromycin against P. aeruginosa (31.1-8.0-fold). Also, a maximum increase in IFA when erythromycin and vancomycin were synergized with AgNPs against E. cloacae was reported (IFA of 10.0 and 9.0, respectively). Similarly, AgNPs with either aztreonam or azlocillin against E. coli and amoxicillin, ciprofloxacin, or ceftriaxone against Shigella sp. caused an increase in the fold area of inhibition of between 5.3-3.7-fold. This result may have an advantage in encouraging the use of combined AgNPS with conventional antibiotics in treating infectious diseases caused by antibiotic-resistant bacteria.
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Green Synthesis, Characterization and Application of Natural Product Coated Magnetite Nanoparticles for Wastewater Treatment. NANOMATERIALS 2020; 10:nano10081615. [PMID: 32824673 PMCID: PMC7466664 DOI: 10.3390/nano10081615] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 12/12/2022]
Abstract
Adsorption of organic pollutants, toxic metal ions, and removal of harmful bacteria can give us clean and pure drinkable water from wastewater resources. Respective magnetite nanoparticles (MNPs) were synthesized using a cheaper and greener way in an open-air environment with the use of crude latex of Jatropha curcas (JC) and leaf extract of Cinnamomum tamala (CT). Characterization of MNPs had been performed by dynamic light scattering (DLS), Ultraviolet-visible (UV-vis) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, powdered X-ray diffraction (XRD), and field emission scanning electron microscope (FE-SEM). The size ranges of the synthesized MNPs were observed in between 20-42 nm for JC-Fe3O4 and within 26-35 nm for CT-Fe3O4 by FE-SEM images. The effect of synthesized magnetic nanoparticles in wastewater treatment (bacterial portion), dye adsorption, toxic metal removal as well as antibacterial, antioxidant, and cytotoxic activities were studied. This purification will lead to an increase in the resources of pure drinking water in the future.
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Gaurav I, Singh T, Thakur A, Kumar G, Rathee P, Kumari P, Sweta K. Synthesis, In-Vitro and In-Silico Evaluation of Silver Nanoparticles with Root Extract of Withania somnifera for Antibacterial Activity via Binding of Penicillin-Binding Protein-4. Curr Pharm Biotechnol 2020; 21:1674-1687. [PMID: 32614743 DOI: 10.2174/1389201021666200702152000] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/24/2020] [Accepted: 05/08/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Metal Nanoparticles (NPs) have been widely used for various applications in biomedical sciences, including in drug delivery, and as therapeutic agents, but limited owing to their toxicity towards the healthy tissue. This warrants an alternative method, which can achieve the desired activity with much reduced or no toxicity. Being a biological product, Withania somnifera (W. somnifera) is environment friendly, besides being less toxic as compared to metal-based NPs. However, the exact mechanism of action of W. somnifera for its antibacterial activities has not been studied so far. OBJECTIVE To develop "silver nanoparticles with root extract of W. somnifera (AgNPs-REWS)" for antimicrobial and anticancer activities. Furthermore, the analysis of their mechanism of action will be studied. METHODS Using the in-silico approach, the molecular docking study was performed to evaluate the possible antibacterial mechanism of W. somnifera phytochemicals such as Anaferine, Somniferine, Stigmasterol, Withaferin A, Withanolide- A, G, M, and Withanone by the inhibition of Penicillin- Binding Protein 4 (PBP4). Next, we utilized a bottom-up approach for the green synthesis of AgNPs- REWS, performed an in-detail phytochemical analysis, confirmed the AgNPs-REWS by SEM, UVvisible spectroscopy, XRD, FT-IR, and HPLC. Eventually, we examined their antibacterial activity. RESULTS The result of molecular docking suggests that WS phytochemicals (Somniferine, Withaferin A, Withanolide A, Withanolide G, Withanolide M, and Withanone) possess the higher binding affinity toward the active site of PBP4 as compared to the Ampicillin (-6.39 kcal/mol) reference molecule. These phytochemicals predicted as potent inhibitors of PBP4. Next, as a proof-of-concept, AgNPs- REWS showed significant antibacterial effect as compared to crude, and control; against Xanthomonas and Ralstonia species. CONCLUSION The in-silico and molecular docking analysis showed that active constituents of W. somnifera such as Somniferine, Withaferin A, Withanolide A, Withanolide G, Withanolide M, and Withanone possess inhibition potential for PBP4 and are responsible for the anti-bacterial property of W. somnifera extract. This study also establishes that AgNPs via the green synthesis with REWS showed enhanced antibacterial activity towards pathogenic bacteria.
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Affiliation(s)
- Isha Gaurav
- Department of Botany, Magadh University, Bodh Gaya, Bihar, India
| | - Tanuja Singh
- Department of Botany, Thakur Prasad Singh College (Patliputra University), Patna, Bihar, India
| | - Abhimanyu Thakur
- Department of Pharmaceutical Sciences and Technology, Birla Institute of Technology Mesra, Ranchi, Jharkhand, India
| | - Gaurav Kumar
- School of Biological and Biomedical Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| | - Parth Rathee
- Department of Chemistry, University of Miami, Coral Gables, Florida, United States
| | - Puja Kumari
- Department of Pharmaceutical Sciences and Technology, Birla Institute of Technology Mesra, Ranchi, Jharkhand, India
| | - Kumari Sweta
- Department of Pharmaceutical Sciences and Technology, Birla Institute of Technology Mesra, Ranchi, Jharkhand, India
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Green Synthesis of Silver Nanoparticles from Caralluma tuberculata Extract and its Antibacterial Activity. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01586-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Mohamed DS, Abd El-Baky RM, Sandle T, Mandour SA, Ahmed EF. Antimicrobial Activity of Silver-Treated Bacteria against other Multi-Drug Resistant Pathogens in Their Environment. Antibiotics (Basel) 2020; 9:antibiotics9040181. [PMID: 32326384 PMCID: PMC7235873 DOI: 10.3390/antibiotics9040181] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 04/08/2020] [Accepted: 04/10/2020] [Indexed: 11/16/2022] Open
Abstract
Silver is a potent antimicrobial agent against a variety of microorganisms and once the element has entered the bacterial cell, it accumulates as silver nanoparticles with large surface area causing cell death. At the same time, the bacterial cell becomes a reservoir for silver. This study aims to test the microcidal effect of silver-killed E. coli O104: H4 and its supernatant against fresh viable cells of the same bacterium and some other species, including E. coli O157: H7, Multidrug Resistant (MDR) Pseudomonas aeruginosa and Methicillin Resistant Staphylococcus aureus (MRSA). Silver-killed bacteria were examined by Transmission Electron Microscopy (TEM). Agar well diffusion assay was used to test the antimicrobial efficacy and durability of both pellet suspension and supernatant of silver-killed E. coli O104:H4 against other bacteria. Both silver-killed bacteria and supernatant showed prolonged antimicrobial activity against the tested strains that extended to 40 days. The presence of adsorbed silver nanoparticles on the bacterial cell and inside the cells was verified by TEM. Silver-killed bacteria serve as an efficient sustained release reservoir for exporting the lethal silver cations. This promotes its use as a powerful disinfectant for polluted water and as an effective antibacterial which can be included in wound and burn dressings to overcome the problem of wound contamination.
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Affiliation(s)
- Doaa Safwat Mohamed
- Microbiology and Immunology Department, Faculty of Pharmacy, Deraya University, Minia 11566, Egypt; (D.S.M.); (S.A.M.); (E.F.A.)
| | - Rehab Mahmoud Abd El-Baky
- Microbiology and Immunology Department, Faculty of Pharmacy, Deraya University, Minia 11566, Egypt; (D.S.M.); (S.A.M.); (E.F.A.)
- Microbiology and Immunology Department, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
- Correspondence:
| | - Tim Sandle
- School of Health Sciences, Division of Pharmacy & Optometry, University of Manchester, Manchester M13 9NT, UK;
| | - Sahar A. Mandour
- Microbiology and Immunology Department, Faculty of Pharmacy, Deraya University, Minia 11566, Egypt; (D.S.M.); (S.A.M.); (E.F.A.)
| | - Eman Farouk Ahmed
- Microbiology and Immunology Department, Faculty of Pharmacy, Deraya University, Minia 11566, Egypt; (D.S.M.); (S.A.M.); (E.F.A.)
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Agressott EV, Blätte D, Cunha FA, Noronha VT, Ciesielski R, Hartschuh A, Paula AJD, Fechine PB, Souza Filho A, Paschoal AR. Vibrational Spectroscopy and Morphological Studies on Protein-Capped Biosynthesized Silver Nanoparticles. ACS OMEGA 2020; 5:386-393. [PMID: 31956786 PMCID: PMC6964295 DOI: 10.1021/acsomega.9b02867] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 10/28/2019] [Indexed: 05/26/2023]
Abstract
Silver nanoparticles (AgNPs) have a large number of applications in technology and physical and biological sciences. These nanomaterials can be synthesized by chemical and biological methods. The biological synthesis using fungi represents a green approach for nanomaterial production that has the advantage of biocompatibility. This work studies silver nanoparticles (AgNPs) produced by fungi Rhodotorula glutinis and Rhodotorula mucilaginosa found in ordinary soil of the Universidade Federal do Ceará campus (Brazil). The biosynthesized AgNPs have a protein-capping layer involving a metallic Ag core. The focus of this paper is to investigate the size and structure of the capping layer, how it interacts with the Ag core, and how sensitive the system (core + protein) is to visible light illumination. For this, we employed SEM, AFM, photoluminescence spectroscopy, SERS, and dark-field spectroscopy. The AgNPs were isolated, and SEM measurements showed the average size diameter between 58 nm for R. glutinis and 30 nm for R. mucilaginosa. These values are in agreement with the AFM measurements, which also provided the average size diameter of 85 nm for R. glutinis and 56 nm for R. mucilaginosa as well as additional information about the average size of the protein-capping layers, whose found values were 24 and 21 nm for R. mucilaginosa and R. glutinis nanoparticles, respectively. The protein-capping layer structure seemed to be easily disturbed, and the SERS spectra were unstable. It was possible to identify Raman peaks that might be related to α-helix, β-sheet, and protein mixed structures. Finally, dark-field microscopy showed that the silver cores are very stable, but some are affected by the laser energy due to heating or melting.
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Affiliation(s)
| | - Dominic Blätte
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Francisco Afrânio Cunha
- Grupo de Química de Materiais
Avançados (GQMat), Departamento de Química Analítica
e Físico-Química, Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
- Laboratório
de Microbiologia de Leveduras da Faculdade de Farmácia da Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
| | - Victor T. Noronha
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Richard Ciesielski
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Achim Hartschuh
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Amauri Jardim de Paula
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Pierre Basílio
Almeida Fechine
- Grupo de Química de Materiais
Avançados (GQMat), Departamento de Química Analítica
e Físico-Química, Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
| | - Antônio
Gomes Souza Filho
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Alexandre Rocha Paschoal
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
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Abstract
In this study, colloidal metal nanoparticles have been prepared by the wet-chemical synthesis method. Gold and silver nanoparticles with approximate sphere shape were synthesized through the citrate-reduction method. The colloidal metal nanoparticles were characterized by using UV-vis absorption spectroscopy, photon cross-correlation spectroscopy (PCCS) and transmission electron microscope (TEM). Catalytic activities of the metal nanoparticles were investigated through reduction of 2,4-dinitrophenol to 2,4-diaminophenol in the presence of NaBH4 at room temperature. Both gold and silver nanoparticles showed an excellent catalytic activity.
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