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Oves M, Rauf MA, Qari HA. Therapeutic Applications of Biogenic Silver Nanomaterial Synthesized from the Paper Flower of Bougainvillea glabra (Miami, Pink). NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13030615. [PMID: 36770576 PMCID: PMC9920917 DOI: 10.3390/nano13030615] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/30/2023] [Accepted: 01/30/2023] [Indexed: 05/29/2023]
Abstract
In this research, Bougainvillea glabra paper flower extract was used to quickly synthesize biogenic silver nanoparticles (BAgNPs) utilizing green chemistry. Using the flower extract as a biological reducing agent, silver nanoparticles were generated by the conversion of Ag+ cations to Ag0 ions. Data patterns obtained from physical techniques for characterizing BAgNPs, employing UV-visible, scattering electron microscope (SEM), transmission electron microscope (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR), suggested that the nanoparticles have a spherical to oval form with size ranging from 10 to 50 nm. Spectroscopy and microscopic analysis were used to learn more about the antibacterial properties of the biologically produced BAgNPs from Bougainvillea glabra. Further, the potential mechanism of action of nanoparticles was investigated by studying their interactions in vitro with several bacterial strains and mammalian cancer cell systems. Finally, we can conclude that BAgNPs can be functionalized to dramatically inhibit bacterial growth and the growth of cancer cells in culture conditions, suggesting that biologically produced nanomaterials will provide new opportunities for a wide range of biomedical applications in the near future.
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Affiliation(s)
- Mohammad Oves
- Centre of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 22252, Saudi Arabia
| | - Mohd Ahmar Rauf
- Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Huda A. Qari
- Biological Science Department, Faculty of Science, King Abdulaziz University, Jeddah 22252, Saudi Arabia
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2
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He Y, Capobianco J, Irwin P, Reed S, Lee J. Antimicrobial effect of zinc oxide nanoparticles on
Campylobacter jejuni
and
Salmonella enterica
serovar Enteritidis. J Food Saf 2022. [DOI: 10.1111/jfs.12979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yiping He
- United States Department of Agriculture, Agriculture Research Service Eastern Regional Research Center Wyndmoor Pennsylvania USA
| | - Joseph Capobianco
- United States Department of Agriculture, Agriculture Research Service Eastern Regional Research Center Wyndmoor Pennsylvania USA
| | - Peter Irwin
- United States Department of Agriculture, Agriculture Research Service Eastern Regional Research Center Wyndmoor Pennsylvania USA
| | - Sue Reed
- United States Department of Agriculture, Agriculture Research Service Eastern Regional Research Center Wyndmoor Pennsylvania USA
| | - Joe Lee
- United States Department of Agriculture, Agriculture Research Service Eastern Regional Research Center Wyndmoor Pennsylvania USA
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3
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Krishnamurthi VR, Niyonshuti II, Chen J, Wang Y. A new analysis method for evaluating bacterial growth with microplate readers. PLoS One 2021; 16:e0245205. [PMID: 33434196 PMCID: PMC7802944 DOI: 10.1371/journal.pone.0245205] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/23/2020] [Indexed: 12/19/2022] Open
Abstract
Growth curve measurements are commonly used in microbiology, while the use of microplate readers for such measurements provides better temporal resolution and higher throughput. However, evaluating bacterial growth with microplate readers has been hurdled by barriers such as multiple scattering. Here, we report our development of a method based on the time derivatives of the optical density (OD) and/or fluorescence (FL) of bacterial cultures to overcome these barriers. First, we illustrated our method using quantitative models and numerical simulations, which predicted the number of bacteria and the number of fluorescent proteins in time as well as their time derivatives. Then, we systematically investigated how the time derivatives depend on the parameters in the models/simulations, providing a framework for understanding the FL growth curves. In addition, as a demonstration, we applied our method to study the lag time elongation of bacteria subjected to treatment with silver (Ag+) ions and found that the results from our method corroborated well with that from growth curve fitting by the Gompertz model that has been commonly used in the literature. Furthermore, this method was applied to the growth of bacteria in the presence of silver nanoparticles (AgNPs) at various concentrations, where the OD curve measurements failed. We showed that our method allowed us to successfully extract the growth behavior of the bacteria from the FL measurements and understand how the growth was affected by the AgNPs.
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Affiliation(s)
| | - Isabelle I. Niyonshuti
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, United States of America
| | - Jingyi Chen
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, United States of America
- Materials Science and Engineering Program, University of Arkansas, Fayetteville, AR, United States of America
| | - Yong Wang
- Department of Physics, University of Arkansas, Fayetteville, AR, United States of America
- Materials Science and Engineering Program, University of Arkansas, Fayetteville, AR, United States of America
- Cell and Molecular Biology Program, University of Arkansas, Fayetteville, AR, United States of America
- * E-mail:
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4
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Guglielmelli A, Rosa P, Contardi M, Prato M, Mangino G, Miglietta S, Petrozza V, Pani R, Calogero A, Athanassiou A, Perotto G, De Sio L. Biomimetic keratin gold nanoparticle-mediated in vitro photothermal therapy on glioblastoma multiforme. Nanomedicine (Lond) 2021; 16:121-138. [PMID: 33426900 DOI: 10.2217/nnm-2020-0349] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Aim: To realize and characterize a new generation of keratin-coated gold nanoparticles (Ker-AuNPs) as highly efficient photosensitive nanosized therapeutics for plasmonic photothermal (PPT) therapy. Materials & methods: The chemical, physical, morphological and photothermal properties of Ker-AuNPs are investigated using dynamic light scattering, ζ-potential, UV-Visible, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, transmission electron microscopy and high-resolution thermography. In vitro experiments are performed on a human glioblastoma cell line (i.e., U87-MG), using viability assays, transmission electron microscopy, fluorescence microscopy, cytometric analyses and PPT experiments. Results: Experiments confirm the excellent biocompatibility of Ker-AuNPs, their efficient cellular uptake and localized photothermal heating capabilities. Conclusion: The reported structural and functional properties pointed out these Ker-AuNPs as a promising new tool in the field of biocompatible photothermal agents for PPT treatments against cancer-related diseases.
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Affiliation(s)
- Alexa Guglielmelli
- Department of Physics, University of Calabria, Arcavacata di Rende, Cosenza 87036, Italy.,CNR-Lab. LiCryl, Institute NANOTEC, Arcavacata di Rende 87036, Italy
| | - Paolo Rosa
- Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
| | - Marco Contardi
- Smart Materials, Istituto Italiano di Tecnologia, Via Morego, Genoa 30, 16163, Italy
| | - Mirko Prato
- Materials Characterization Facility, Istituto Italiano di Tecnologia, Via Morego, Genova 30, 16163, Italy
| | - Giorgio Mangino
- Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
| | - Selenia Miglietta
- Department of Anatomy, Histology, Forensic Medicine & Orthopaedics, Sapienza University of Rome, Via Alfonso Borelli, Rome 50, 00161, Italy
| | - Vincenzo Petrozza
- Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
| | - Roberto Pani
- Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
| | - Antonella Calogero
- Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
| | | | - Giovanni Perotto
- Smart Materials, Istituto Italiano di Tecnologia, Via Morego, Genoa 30, 16163, Italy
| | - Luciano De Sio
- CNR-Lab. LiCryl, Institute NANOTEC, Arcavacata di Rende 87036, Italy.,Department of Medico-surgical Sciences & Biotechnologies, Center for Biophotonics, Sapienza University of Rome, Corso della Repubblica, Latina 79, 04100, Italy
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5
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Krce L, Šprung M, Maravić A, Umek P, Salamon K, Krstulović N, Aviani I. Bacteria Exposed to Silver Nanoparticles Synthesized by Laser Ablation in Water: Modelling E. coli Growth and Inactivation. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E653. [PMID: 32024125 PMCID: PMC7040691 DOI: 10.3390/ma13030653] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 01/29/2020] [Accepted: 01/30/2020] [Indexed: 12/19/2022]
Abstract
This study is aimed to better understand the bactericidal mode of action of silver nanoparticles. Here we present the production and characterization of laser-synthesized silver nanoparticles along with growth curves of bacteria treated at sub-minimal and minimal inhibitory concentrations, obtained by optical density measurements. The main effect of the treatment is the increase of the bacterial apparent lag time, which is very well described by the novel growth model as well as the entire growth curves for different concentrations. The main assumption of the model is that the treated bacteria uptake the nanoparticles and inactivate, which results in the decrease of both the nanoparticles and the bacteria concentrations. The lag assumes infinitive value for the minimal inhibitory concentration treatment. This apparent lag phase is not postponed bacterial growth. It is a dynamic state in which the bacterial growth and death rates are close in value. Our results strongly suggest that the predominant mode of antibacterial action of silver nanoparticles is the penetration inside the membrane.
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Affiliation(s)
- Lucija Krce
- Faculty of Science, Department of Physics, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia;
| | - Matilda Šprung
- Faculty of Science, Department of Chemistry, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia;
| | - Ana Maravić
- Faculty of Science, Department of Biology, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia;
| | - Polona Umek
- Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;
| | - Krešimir Salamon
- Ruđer Bošković Institute, Bijenička cesta 54, 10 000 Zagreb, Croatia;
| | - Nikša Krstulović
- Institute of Physics, Bijenička cesta 46, 10000 Zagreb, Croatia;
| | - Ivica Aviani
- Faculty of Science, Department of Physics, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia;
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6
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Chatterjee T, Chatterjee BK, Chakrabarti P. Modelling of growth kinetics of Vibrio cholerae in presence of gold nanoparticles: effect of size and morphology. Sci Rep 2017; 7:9671. [PMID: 28851910 PMCID: PMC5575114 DOI: 10.1038/s41598-017-09357-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 07/25/2017] [Indexed: 01/05/2023] Open
Abstract
Emergence of multiple drug resistant strains of pathogenic bacteria calls for new initiatives to combat infectious diseases. Gold nanoparticles (AuNPs), because of their non-toxic nature and size/shape dependent optical properties, offer interesting possibility. Here we report the antibacterial efficacy of AuNPs of different size and shape (AuNS10, AuNS100 and AuNR10; the number indicating the diameter in nm; S stands for sphere and R for rod) against the classical (O395) and El Tor (N16961) biotypes of Vibrio cholerae, the etiological agent responsible for cholera. Growth kinetics was monitored by measuring optical density at different time intervals and fitted by non-linear regression of modified Buchanan model. Sigmoidal growth curve for VcO395 indicated the existence of single phenotype population and was affected by AuNR10 only, implying the importance of morphology of AuNP. Growth of VcN16961 was affected by all three AuNPs indicating the vulnerability of El Tor biotype. Interestingly, VcN16961 exhibited the occurrence of two phenotypic subpopulations - one with shorter (vulnerable Type 1) and the other with extended (tolerant Type 2) lag phase. Various assays were conducted to probe the impact of AuNPs on bacterial cells. Apart from AuNR10, antimicrobial efficacy of AuNS10 was better compared to AuNS100.
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Affiliation(s)
- Tanaya Chatterjee
- Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata, 700054, India.
| | - Barun K Chatterjee
- Department of Physics, Bose Institute, 93/1A.P.C. Road, Kolkata, 700009, India
| | - Pinak Chakrabarti
- Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata, 700054, India
- Bioinformatics Centre, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata, 700054, India
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7
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Gupta S, Kumar V, Joshi KB. Solvent mediated photo-induced morphological transformation of AgNPs-peptide hybrids in water-EtOH binary solvent mixture. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.03.114] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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8
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Chatterjee T, Chatterjee BK, Majumdar D, Chakrabarti P. Antibacterial effect of silver nanoparticles and the modeling of bacterial growth kinetics using a modified Gompertz model. Biochim Biophys Acta Gen Subj 2014; 1850:299-306. [PMID: 25450183 DOI: 10.1016/j.bbagen.2014.10.022] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 10/17/2014] [Accepted: 10/21/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND An alternative to conventional antibiotics is needed to fight against emerging multiple drug resistant pathogenic bacteria. In this endeavor, the effect of silver nanoparticle (Ag-NP) has been studied quantitatively on two common pathogenic bacteria Escherichia coli and Staphylococcus aureus, and the growth curves were modeled. METHODS The effect of Ag-NP on bacterial growth kinetics was studied by measuring the optical density, and was fitted by non-linear regression using the Logistic and modified Gompertz models. Scanning Electron Microscopy and fluorescence microscopy were used to study the morphological changes of the bacterial cells. Generation of reactive oxygen species for Ag-NP treated cells were measured by fluorescence emission spectra. RESULTS The modified Gompertz model, incorporating cell death, fits the observed data better than the Logistic model. With increasing concentration of Ag-NP, the growth kinetics of both bacteria shows a decline in growth rate with simultaneous enhancement of death rate constants. The duration of the lag phase was found to increase with Ag-NP concentration. SEM showed morphological changes, while fluorescence microscopy using DAPI showed compaction of DNA for Ag-NP-treated bacterial cells. CONCLUSIONS E. coli was found to be more susceptible to Ag-NP as compared to S. aureus. The modified Gompertz model, using a death term, was found to be useful in explaining the non-monotonic nature of the growth curve. GENERAL SIGNIFICANCE The modified Gompertz model derived here is of general nature and can be used to study any microbial growth kinetics under the influence of antimicrobial agents.
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Affiliation(s)
- Tanaya Chatterjee
- Department of Biochemistry, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata 700054, India.
| | - Barun K Chatterjee
- Department of Physics, Bose Institute, 93/1 A.P.C. Road, Kolkata 700009, India
| | - Dipanwita Majumdar
- Department of Physics, Bose Institute, 93/1 A.P.C. Road, Kolkata 700009, India
| | - Pinak Chakrabarti
- Department of Biochemistry, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata 700054, India; Bioinformatics Centre, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata 700054, India
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9
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Pramanik N, Bhattacharyya A, Kundu PP. Spectroscopic analysis and catalytic application of biopolymer capped silver nanoparticle, an effective antimicrobial agent. J Appl Polym Sci 2014. [DOI: 10.1002/app.41495] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Nilkamal Pramanik
- Advanced Polymer Laboratory; Department of Polymer Science and Technology; University of Calcutta; Kolkata West Bengal 700009 India
| | - Aditi Bhattacharyya
- Advanced Polymer Laboratory; Department of Polymer Science and Technology; University of Calcutta; Kolkata West Bengal 700009 India
| | - Patit Paban Kundu
- Advanced Polymer Laboratory; Department of Polymer Science and Technology; University of Calcutta; Kolkata West Bengal 700009 India
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10
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Aramwit P, Bang N, Ratanavaraporn J, Ekgasit S. Green synthesis of silk sericin-capped silver nanoparticles and their potent anti-bacterial activity. NANOSCALE RESEARCH LETTERS 2014; 9:79. [PMID: 24533676 PMCID: PMC3996096 DOI: 10.1186/1556-276x-9-79] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 02/10/2014] [Indexed: 06/03/2023]
Abstract
In this study, a 'green chemistry' approach was introduced to synthesize silk sericin (SS)-capped silver nanoparticles (AgNPs) under an alkaline condition (pH 11) using SS as a reducing and stabilizing agent instead of toxic chemicals. The SS-capped AgNPs were successfully synthesized at various concentrations of SS and AgNO3, but the yields were different. A higher yield of SS-capped AgNPs was obtained when the concentrations of SS and AgNO3 were increased. The SS-capped AgNPs showed a round shape and uniform size with diameter at around 48 to 117 nm. The Fourier transform infrared (FT-IR) spectroscopy result proved that the carboxylate groups obtained from alkaline degradation of SS would be a reducing agent for the generation of AgNPs while COO- and NH2 + groups stabilized the AgNPs and prevented their precipitation or aggregation. Furthermore, the SS-capped AgNPs showed potent anti-bacterial activity against various gram-positive bacteria (minimal inhibitory concentration (MIC) 0.008 mM) and gram-negative bacteria (MIC ranging from 0.001 to 0.004 mM). Therefore, the SS-capped AgNPs would be a safe candidate for anti-bacterial applications.
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Affiliation(s)
- Pornanong Aramwit
- Bioactive Resources for Innovative Clinical Applications Research Unit and Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Chulalongkorn University, 254 PhyaThai Road, Patumwan, Bangkok 10330, Thailand
| | - Nipaporn Bang
- Bioactive Resources for Innovative Clinical Applications Research Unit and Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Chulalongkorn University, 254 PhyaThai Road, Patumwan, Bangkok 10330, Thailand
| | - Juthamas Ratanavaraporn
- Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, 254 PhyaThai Road, Patumwan, Bangkok 10330, Thailand
| | - Sanong Ekgasit
- Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 PhyaThai Road, Patumwan, Bangkok 10330, Thailand
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11
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Meshram SM, Bonde SR, Gupta IR, Gade AK, Rai MK. Green synthesis of silver nanoparticles using white sugar. IET Nanobiotechnol 2013; 7:28-32. [DOI: 10.1049/iet-nbt.2012.0002] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Sachin M. Meshram
- Department of BiotechnologySGB Amravati UniversityAmravati 444 602MaharashtraIndia
| | - Shital R. Bonde
- Department of BiotechnologySGB Amravati UniversityAmravati 444 602MaharashtraIndia
| | - Indarchand R. Gupta
- Department of BiotechnologySGB Amravati UniversityAmravati 444 602MaharashtraIndia
| | - Aniket K. Gade
- Department of BiotechnologySGB Amravati UniversityAmravati 444 602MaharashtraIndia
| | - Mahendra K. Rai
- Department of BiotechnologySGB Amravati UniversityAmravati 444 602MaharashtraIndia
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12
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Differentiation and characterization of isotopically modified silver nanoparticles in aqueous media using asymmetric-flow field flow fractionation coupled to optical detection and mass spectrometry. Anal Chim Acta 2013; 763:57-66. [DOI: 10.1016/j.aca.2012.11.060] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 11/28/2012] [Accepted: 11/30/2012] [Indexed: 11/23/2022]
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13
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dos Santos CA, Jozala AF, Pessoa A, Seckler MM. Antimicrobial effectiveness of silver nanoparticles co-stabilized by the bioactive copolymer pluronic F68. J Nanobiotechnology 2012. [PMID: 23193983 PMCID: PMC3570368 DOI: 10.1186/1477-3155-10-43] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
BACKGROUND Silver nanoparticles (AgNps) have attracted much interest in biomedical engineering, since they have excellent antimicrobial properties. Therefore, AgNps have often been considered for incorporation into medical products for skin pathologies to reduce the risk of contamination. This study aims at evaluating the antimicrobial effectiveness of AgNps stabilized by pluronic™ F68 associated with other polymers such as polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP). METHODS AgNps antimicrobial activity was evaluated using the minimum inhibitory concentration (MIC) method. The action spectrum was evaluated for different polymers associated with pluronic™ F68 against the gram negative bacteria P. aeuroginosa and E. coli and the gram positive bacteria S. Aureus. RESULTS AgNps stabilized with PVP or PVA and co-stabilized with pluronic™ F68 are effective against E. coli and P. aeruginosa microorganisms, with MIC values as low as 0.78% of the concentration of the original AgNps dispersion. The antimicrobial action against S. aureus is poor, with MIC values not lower than 25%. CONCLUSIONS AgNps stabilized by different polymeric systems have shown improved antimicrobial activity against gram-negative microorganisms in comparison to unstabilized AgNps. Co-stabilization with the bioactive copolymer pluronic™ F68 has further enhanced the antimicrobial effectiveness against both microorganisms. A poor effectiveness has been found against the gram-positive S. aureus microorganism. Future assays are being delineated targeting possible therapeutic applications.
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Affiliation(s)
- Carolina Alves dos Santos
- Department of Chemical Engineering of the Polytechnic School, University of São Paulo (USP), São Paulo, Brazil.
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14
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Martínez-Abad A, Sánchez G, Lagaron J, Ocio M. On the different growth conditions affecting silver antimicrobial efficacy on Listeria monocytogenes and Salmonella enterica. Int J Food Microbiol 2012; 158:147-54. [DOI: 10.1016/j.ijfoodmicro.2012.07.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 06/29/2012] [Accepted: 07/08/2012] [Indexed: 10/28/2022]
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15
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Hydroxyl functional polyester dendrimers as stabilizing agent for preparation of colloidal silver particles—a study in respect to antimicrobial properties and toxicity against human cells. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2650-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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16
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Immobilization of antibacterial dihydropyrrol-2-ones on functional polymer supports to prevent bacterial infections in vivo. Antimicrob Agents Chemother 2011; 56:1138-41. [PMID: 22143522 DOI: 10.1128/aac.05814-11] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Antibiotic-resistant Staphylococcus aureus is of great concern, as it causes a wide range of life-threatening infections. The current study demonstrates that dihydropyrrolone (DHP)-coated polyacrylamide substrates are effective in reducing the number of culturable clinical isolates of S. aureus in vitro in a dose-dependent manner and are able to reduce the pathogenic potential of staphylococcal infection in a subcutaneous infection model. Covalently bound DHPs therefore show great potential for use as an antimicrobial strategy in device-related applications.
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