401
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Subba Rao Y, Kotakadi VS, Prasad TNVKV, Reddy AV, Sai Gopal DVR. Green synthesis and spectral characterization of silver nanoparticles from Lakshmi tulasi (Ocimum sanctum) leaf extract. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 103:156-9. [PMID: 23257344 DOI: 10.1016/j.saa.2012.11.028] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 11/03/2012] [Accepted: 11/06/2012] [Indexed: 05/09/2023]
Abstract
A simple method for the green synthesis of silver nanoparticles (AgNPs) using aqueous extract of Lakshmi tulasi (Ocimum sanctum) leaf as a reducing and stabilizing agent. AgNPs were rapidly synthesized using aqueous extract of tulasi leaf with AgNO(3) solution within 15 min. The green synthesized AgNPs were characterized using physic-chemical techniques viz., UV-Vis, X-ray diffraction (XRD), scanning electron microscope (SEM) coupled with X-ray energy dispersive spectroscopy (EDX) and Fourier transform-infrared spectroscopy (FT-IR). Characterization data reveals that the particles were crystalline in nature and triangle shaped with an average size of 42 nm. The zeta potential of AgNPs were found to be -55.0 mV. This large negative zeta potential value indicates repulsion among AgNPs and their dispersion stability.
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Affiliation(s)
- Y Subba Rao
- DST-PURSE Centre, Sri Venkateswara University, Tirupati 517 502, AP, India.
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402
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Priyadarshini S, Gopinath V, Meera Priyadharsshini N, MubarakAli D, Velusamy P. Synthesis of anisotropic silver nanoparticles using novel strain, Bacillus flexus and its biomedical application. Colloids Surf B Biointerfaces 2013; 102:232-7. [DOI: 10.1016/j.colsurfb.2012.08.018] [Citation(s) in RCA: 230] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 08/13/2012] [Indexed: 11/28/2022]
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403
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Apte M, Girme G, Bankar A, Ravikumar A, Zinjarde S. 3, 4-dihydroxy-L-phenylalanine-derived melanin from Yarrowia lipolytica mediates the synthesis of silver and gold nanostructures. J Nanobiotechnology 2013; 11:2. [PMID: 23363424 PMCID: PMC3660187 DOI: 10.1186/1477-3155-11-2] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/25/2013] [Indexed: 11/24/2022] Open
Abstract
Background Nanobiotechnology applies the capabilities of biological systems in generating a variety of nano-sized structures. Plants, algae, fungi and bacteria are some systems mediating such reactions. In fungi, the synthesis of melanin is an important strategy for cell-survival under metal-stressed conditions. Yarrowia lipolytica, the biotechnologically significant yeast also produces melanin that sequesters heavy metal ions. The content of this cell-associated melanin is often low and precursors such as L-tyrosine or 3, 4-dihydroxy-L-phenylalanine (L-DOPA) can enhance its production. The induced melanin has not been exploited for the synthesis of nanostructures. In this investigation, we have employed L-DOPA-melanin for the facile synthesis of silver and gold nanostructures. The former have been used for the development of anti-fungal paints. Methods Yarrowia lipolytica NCIM 3590 cells were incubated with L-DOPA for 18 h and the resultant dark pigment was subjected to physical and chemical analysis. This biopolymer was used as a reducing and stabilizing agent for the synthesis of silver and gold nanostructures. These nanoparticles were characterized by UV-Visible spectra, X-ray diffraction (XRD) studies, and electron microscopy. Silver nanoparticles were evaluated for anti-fungal activity. Results The pigment isolated from Y. lipolytica was identified as melanin. The induced pigment reduced silver nitrate and chloroauric acid to silver and gold nanostructures, respectively. The silver nanoparticles were smaller in size (7 nm) and displayed excellent anti-fungal properties towards an Aspergillus sp. isolated from a wall surface. An application of these nanoparticles as effective paint-additives has been demonstrated. Conclusion The yeast mediated enhanced production of the metal-ion-reducing pigment, melanin. A simple and rapid method for the extracellular synthesis of nanoparticles with paint-additive-application was developed.
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Affiliation(s)
- Mugdha Apte
- Institute of Bioinformatics and Biotechnology, University of Pune, Pune, India
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404
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Ganeshkumar M, Sathishkumar M, Ponrasu T, Dinesh MG, Suguna L. Spontaneous ultra fast synthesis of gold nanoparticles using Punica granatum for cancer targeted drug delivery. Colloids Surf B Biointerfaces 2013; 106:208-16. [PMID: 23434714 DOI: 10.1016/j.colsurfb.2013.01.035] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 01/02/2013] [Indexed: 12/19/2022]
Abstract
Rapid synthesis of mono-dispersed gold nanoparticles through economically feasible green chemistry approach is highly desirable. In this study, we have developed a method to synthesize mono-dispersed gold nanoparticles (PAuNPs) by mixing gold solution with fruit peel extract of Punica granutum without using any surfactant or external energy. In this method, physiologically stable, biocompatible PAuNPs were formed within 60s. Casein, being a biocompatible polymer, is used to couple the prepared PAuNPs for functionalization of folic acid, which is highly expressed in cancer cells. These functionalized PAuNPs could be used for targeted drug delivery for cancer with enhanced therapeutic efficacy and minimal side effects. PAuNPs were characterized by UV, IR, TEM, Particle size analyzer and zeta potential measurement. In vitro stability of the PAuNPs was also analyzed. Hemocompatibility of PAuNPs was evaluated in human blood samples and found that the particles were hemocompatible. The toxicity of the PAuNPs, 5-Fu and 5Fu@PAuNPs was analyzed in zebrafish embryos. The in vitro cytotoxicity of free 5-Fu, 5Fu@PAuNPs-Fa was investigated against MCF-7 cells (breast cancer) and observed that the amount of 5-Fu required to achieve 50% of growth of inhibition (Ic50) was much lower when compared to free 5-Fu.
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Affiliation(s)
- Moorthy Ganeshkumar
- Department of Biochemistry, Central Leather Research Institute, Council of Scientific and Industrial Research, Chennai 600020, India
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405
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Ladj R, Bitar A, Eissa M, Mugnier Y, Le Dantec R, Fessi H, Elaissari A. Individual inorganic nanoparticles: preparation, functionalization and in vitro biomedical diagnostic applications. J Mater Chem B 2013; 1:1381-1396. [PMID: 32260777 DOI: 10.1039/c2tb00301e] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Inorganic nanoparticles have become the focus of modern materials science due to their potential technological importance, particularly in bionanotechnology, which stems from their unique physical properties including size-dependent optical, magnetic, electronic, and catalytic properties. The present article provides an overview on the currently used individual inorganic nanoparticles for in vitro biomedical domains. These inorganic nanoparticles include iron oxides, gold, silver, silica, quantum dots (QDs) and second harmonic generation (SHG) particles. For each of these interesting nanoparticles, the main issues starting from preparation up to bio-related applications are presented.
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Affiliation(s)
- R Ladj
- University of Lyon, F-69622 Lyon, France, University of Lyon-1, Villeurbanne, LAGEP, UMR 5007, CPE, 43 bd 11 November 1918, F-69622 Villeurbanne, France.
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406
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Tian Z, Wang L, Jia L, Li Q, Song Q, Su S, Yang H. A novel biomass coated Ag–TiO2 composite as a photoanode for enhanced photocurrent in dye-sensitized solar cells. RSC Adv 2013. [DOI: 10.1039/c3ra40195b] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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407
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Alam MN, Roy N, Mandal D, Begum NA. Green chemistry for nanochemistry: exploring medicinal plants for the biogenic synthesis of metal NPs with fine-tuned properties. RSC Adv 2013. [DOI: 10.1039/c3ra23133j] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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408
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Fabrication of porous chitosan/silver nanocomposite film and its bactericidal efficacy against multi-drug resistant (MDR) clinical isolates. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.jopr.2012.11.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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409
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Reddy V, Torati RS, Oh S, Kim C. Biosynthesis of Gold Nanoparticles Assisted by Sapindus mukorossi Gaertn. Fruit Pericarp and Their Catalytic Application for the Reduction of p-Nitroaniline. Ind Eng Chem Res 2012. [DOI: 10.1021/ie302037c] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Venu Reddy
- Center for NanoBioEngineering & SpinTronics (nBEST) and Department of Materials Science and Engineering, Chungnam National University, Daejeon, 305-764, South Korea
| | - Ramulu Sri Torati
- Center for NanoBioEngineering & SpinTronics (nBEST) and Department of Materials Science and Engineering, Chungnam National University, Daejeon, 305-764, South Korea
| | - Sunjong Oh
- Center for NanoBioEngineering & SpinTronics (nBEST) and Department of Materials Science and Engineering, Chungnam National University, Daejeon, 305-764, South Korea
| | - CheolGi Kim
- Center for NanoBioEngineering & SpinTronics (nBEST) and Department of Materials Science and Engineering, Chungnam National University, Daejeon, 305-764, South Korea
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410
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Samundeeswari A, Dhas SP, Nirmala J, John SP, Mukherjee A, Chandrasekaran N. Biosynthesis of silver nanoparticles using actinobacteriumStreptomyces albogriseolusand its antibacterial activity. Biotechnol Appl Biochem 2012; 59:503-7. [PMID: 23586961 DOI: 10.1002/bab.1054] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 10/18/2012] [Indexed: 11/09/2022]
Affiliation(s)
| | - Sindhu Priya Dhas
- Centre for Nanobiotechnology; VIT University; Vellore; Tamil Nadu; India
| | - Joyce Nirmala
- Centre for Nanobiotechnology; VIT University; Vellore; Tamil Nadu; India
| | - Shiny Punalur John
- Centre for Nanobiotechnology; VIT University; Vellore; Tamil Nadu; India
| | - Amitava Mukherjee
- Centre for Nanobiotechnology; VIT University; Vellore; Tamil Nadu; India
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411
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Amin M, Iram F, Iqbal MS, Saeed MZ, Raza M, Alam S. Arabinoxylan-mediated synthesis of gold and silver nanoparticles having exceptional high stability. Carbohydr Polym 2012; 92:1896-900. [PMID: 23399234 DOI: 10.1016/j.carbpol.2012.11.056] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2012] [Revised: 11/10/2012] [Accepted: 11/21/2012] [Indexed: 10/27/2022]
Abstract
A green synthesis of highly stable gold and silver nanoparticles (NPs) using arabinoxylan (AX) from ispaghula (Plantago ovata) seed husk is being reported. The NPs were synthesized by stirring a mixture of AX and HAuCl(4)·H(2)O or AgNO(3), separately, below 100 °C for less than an hour, where AX worked as the reducing and the stabilizing agent. The synthesized NPs were characterized by surface plasmon resonance (SPR) spectroscopy, transmission electron microscopy (TEM), atomic force microscopy (AFM), and X-ray diffraction (XRD). The particle size was (silver: 5-20 nm and gold: 8-30 nm) found to be dependent on pH, temperature, reaction time and concentrations of AX and the metal salts used. The NPs were poly-dispersed with a narrow range. They were stable for more than two years time.
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Affiliation(s)
- Muhammad Amin
- Department of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
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412
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Synthesis and characterization of silver nanoparticles using Cynodon dactylon leaves and assessment of their antibacterial activity. Bioprocess Biosyst Eng 2012; 36:999-1004. [DOI: 10.1007/s00449-012-0841-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 10/10/2012] [Indexed: 10/27/2022]
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413
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MubarakAli D, Arunkumar J, Nag KH, SheikSyedIshack KA, Baldev E, Pandiaraj D, Thajuddin N. Gold nanoparticles from pro and eukaryotic photosynthetic microorganisms--comparative studies on synthesis and its application on biolabelling. Colloids Surf B Biointerfaces 2012. [PMID: 23201734 DOI: 10.1016/j.colsurfb.2012.10.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Today, a material science focuses on the nanoparticles synthesis in general and synthesizing them by biological entity in particular for their marvel production and its remarkable property. In this present study, synthesis of gold nanoparticles using photosynthetic microorganisms such as Coelastrella sp. (eukaryotes) and Phormidium sp. (prokaryotes) were reacted with Chloroauric acid (HAuCl(4)) and bioaccumulation was assessed. Various techniques were adopted for characterization of nanoparticles and compared. It was found to be 25 nm sized nanotriangles and 30 nm sized spherical shaped nanoparticles were synthesized by prokaryotic and eukaryotic microorganisms respectively by TEM analysis. Biogenic gold nanoparticles have potent antioxidant property and the interaction of gold nanoparticles with DNA was evaluated that biogenic nanoparticles were actively bound to DNA in increased concentration. It was revealed that biogenic nanoparticles have wide range of applications depends on the biological entity used. Selection of suitable biological entity is very much important for the production of nanoparticles with desirable shapes and size for the biomedical applications.
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Affiliation(s)
- D MubarakAli
- Division of Microbial Biodiversity and Bioenergy, Department of Microbiology, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
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414
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Jeyaraj M, Rajesh M, Arun R, MubarakAli D, Sathishkumar G, Sivanandhan G, Dev GK, Manickavasagam M, Premkumar K, Thajuddin N, Ganapathi A. An investigation on the cytotoxicity and caspase-mediated apoptotic effect of biologically synthesized silver nanoparticles using Podophyllum hexandrum on human cervical carcinoma cells. Colloids Surf B Biointerfaces 2012; 102:708-17. [PMID: 23117153 DOI: 10.1016/j.colsurfb.2012.09.042] [Citation(s) in RCA: 164] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 09/26/2012] [Accepted: 09/27/2012] [Indexed: 12/28/2022]
Abstract
Now-a-days synthesis and characterization of silver nanoparticles (AgNPs) through biological entity is quite interesting to employ AgNPs for various biomedical applications in general and treatment of cancer in particular. This paper presents the green synthesis of AgNPs using leaf extract of Podophyllum hexandrum Royle and optimized with various parameters such as pH, temperature, reaction time, volume of extract and metal ion concentration for synthesis of AgNPs. TEM, XRD and FTIR were adopted for characterization. The synthesized nanoparticles were found to be spherical shaped with average size of 14 nm. Effects of AgNPs were analyzed against human cervical carcinoma cells by MTT Assay, quantification of ROS, RT-PCR and western blotting techniques. The overall result indicates that AgNPs can selectively inhibit the cellular mechanism of HeLa by DNA damage and caspase mediated cell death. This biological procedure for synthesis of AgNPs and selective inhibition of cancerous cells gives an alternative avenue to treat human cancer effectively.
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Affiliation(s)
- Murugaraj Jeyaraj
- Department of Biotechnology and Genetic Engineering, School of Biotechnology, Bharathidasan University, Tamil Nadu, India.
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415
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Ashraf S, Abbasi AZ, Pfeiffer C, Hussain SZ, Khalid ZM, Gil PR, Parak WJ, Hussain I. Protein-mediated synthesis, pH-induced reversible agglomeration, toxicity and cellular interaction of silver nanoparticles. Colloids Surf B Biointerfaces 2012; 102:511-8. [PMID: 23107938 DOI: 10.1016/j.colsurfb.2012.09.032] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 09/15/2012] [Accepted: 09/17/2012] [Indexed: 12/30/2022]
Abstract
Casein, a milk protein, is used to produce biotolerable and highly stable silver nanoparticles with a fair control over their size without using any additional reducing agent. These silver nanoparticles undergo reversible agglomeration to form protein-silver nanoparticle composite agglomerates as pH approaches to the isoelectric point of casein protein (pI=4.6). These agglomerates can then easily be re-dispersed in alkaline aqueous media with no obvious change in their optical properties. The nanoparticles can withstand high salt concentration (~0.5M), and can also be freeze-dried, stored as dry powder and then dispersed in aqueous media whenever required. More interestingly, by controlling the concentration of casein protein and pH, it was also possible to control the self-assembly of silver nanoparticles to produce fairly uniform spherical agglomerates. The nanoparticles and their agglomerates were thoroughly characterized using UV-visible and FTIR spectroscopy, TEM, SEM and DLS, etc. Cytotoxicity of the hybrid materials was examined using a Resazurin based cytotoxicity assay. After determining the LD(50) using NIH/3T3 fibroblast cells, the cellular interaction of these hybrid nanoparticles was studied to examine the behavior of casein-coated nanoparticles for their potential bio-applications.
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Affiliation(s)
- Sumaira Ashraf
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Jhang road, Faisalabad, Pakistan
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416
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Bokare A, Sanap A, Pai M, Sabharwal S, Athawale AA. Antibacterial activities of Nd doped and Ag coated TiO2 nanoparticles under solar light irradiation. Colloids Surf B Biointerfaces 2012; 102:273-80. [PMID: 23010118 DOI: 10.1016/j.colsurfb.2012.08.030] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2012] [Revised: 08/13/2012] [Accepted: 08/14/2012] [Indexed: 10/28/2022]
Abstract
Nanosized (8-9 nm) Nd doped and Ag coated TiO(2) nanoparticles have been synthesized by sol-gel method. The physicochemical properties of these particles were investigated by X-ray diffraction (XRD), diffuse reflectance UV-visible (DRUV) spectra and Brunauer-Emmett-Teller (BET) surface area analysis. The antibacterial activities of the samples were studied for Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) both, under the light and dark conditions. The results reveal that the extent of activity shows the order as undoped TiO(2)<Nd doped TiO(2)<Ag coated TiO(2). The mechanism of bactericidal action of the nanoparticles, in presence of sunlight has been explained with the help of microscopic analyses. The bacterial damage is observed to proceed through initial perforation of the cell, damage of cell wall and finally the bacterial death.
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Affiliation(s)
- Anuja Bokare
- Department of Chemistry, University of Pune, Pune 411007, India
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417
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Amin M, Anwar F, Janjua MRSA, Iqbal MA, Rashid U. Green synthesis of silver nanoparticles through reduction with Solanum xanthocarpum L. berry extract: characterization, antimicrobial and urease inhibitory activities against Helicobacter pylori. Int J Mol Sci 2012; 13:9923-9941. [PMID: 22949839 PMCID: PMC3431837 DOI: 10.3390/ijms13089923] [Citation(s) in RCA: 153] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 07/23/2012] [Accepted: 07/25/2012] [Indexed: 11/16/2022] Open
Abstract
A green synthesis route for the production of silver nanoparticles using methanol extract from Solanum xanthocarpum berry (SXE) is reported in the present investigation. Silver nanoparticles (AgNps), having a surface plasmon resonance (SPR) band centered at 406 nm, were synthesized by reacting SXE (as capping as well as reducing agent) with AgNO(3) during a 25 min process at 45 °C. The synthesized AgNps were characterized using UV-Visible spectrophotometry, powdered X-ray diffraction, and transmission electron microscopy (TEM). The results showed that the time of reaction, temperature and volume ratio of SXE to AgNO(3) could accelerate the reduction rate of Ag(+) and affect the AgNps size and shape. The nanoparticles were found to be about 10 nm in size, mono-dispersed in nature, and spherical in shape. In vitro anti-Helicobacter pylori activity of synthesized AgNps was tested against 34 clinical isolates and two reference strains of Helicobacter pylori by the agar dilution method and compared with AgNO(3) and four standard drugs, namely amoxicillin (AMX), clarithromycin (CLA), metronidazole (MNZ) and tetracycline (TET), being used in anti-H. pylori therapy. Typical AgNps sample (S1) effectively inhibited the growth of H. pylori, indicating a stronger anti-H. pylori activity than that of AgNO(3) or MNZ, being almost equally potent to TET and less potent than AMX and CLA. AgNps under study were found to be equally efficient against the antibiotic-resistant and antibiotic-susceptible strains of H. pylori. Besides, in the H. pylori urease inhibitory assay, S1 also exhibited a significant inhibition. Lineweaver-Burk plots revealed that the mechanism of inhibition was noncompetitive.
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Affiliation(s)
- Muhammad Amin
- Department of Chemistry, University of Sargodha, Sargodha 40100, Pakistan; E-Mails: (M.A.); (M.R.S.A.J.); (M.A.I.)
| | - Farooq Anwar
- Department of Chemistry, University of Sargodha, Sargodha 40100, Pakistan; E-Mails: (M.A.); (M.R.S.A.J.); (M.A.I.)
| | | | - Muhammad Awais Iqbal
- Department of Chemistry, University of Sargodha, Sargodha 40100, Pakistan; E-Mails: (M.A.); (M.R.S.A.J.); (M.A.I.)
| | - Umer Rashid
- Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
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418
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Gopinath V, MubarakAli D, Priyadarshini S, Priyadharsshini NM, Thajuddin N, Velusamy P. Biosynthesis of silver nanoparticles from Tribulus terrestris and its antimicrobial activity: A novel biological approach. Colloids Surf B Biointerfaces 2012; 96:69-74. [DOI: 10.1016/j.colsurfb.2012.03.023] [Citation(s) in RCA: 355] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Accepted: 03/30/2012] [Indexed: 11/16/2022]
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419
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Vijayaraghavan K, Nalini SK, Prakash NU, Madhankumar D. One step green synthesis of silver nano/microparticles using extracts of Trachyspermum ammi and Papaver somniferum. Colloids Surf B Biointerfaces 2012; 94:114-7. [DOI: 10.1016/j.colsurfb.2012.01.026] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 01/20/2012] [Accepted: 01/20/2012] [Indexed: 10/14/2022]
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420
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Phyto-synthesis of silver nanoscale particles using Morinda citrifolia L. and its inhibitory activity against human pathogens. Colloids Surf B Biointerfaces 2012; 95:235-40. [DOI: 10.1016/j.colsurfb.2012.03.001] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 02/29/2012] [Accepted: 03/02/2012] [Indexed: 11/18/2022]
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421
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A novel study of antibacterial activity of copper iodide nanoparticle mediated by DNA and membrane damage. Colloids Surf B Biointerfaces 2012; 96:50-5. [PMID: 22521682 DOI: 10.1016/j.colsurfb.2012.03.021] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 02/08/2012] [Accepted: 03/28/2012] [Indexed: 11/20/2022]
Abstract
In this article potential activity of nanoparticles (NPs) of copper iodide (CuI) as an antibacterial agent has been presented. The nano particles are synthesized by co-precipitation method with an average size of 8 nm as determined by Transmission Electron Microscope (TEM). The average charge of the NPs is -21.5 mV at pH 7 as obtained by zeta potential measurement and purity is determined by XRD. These NPs are able to kill both gram positive and gram negative bacteria. Among the bacteria tested, DH5α is more sensitive but Bacillus subtilis is more resistant to NPs of CuI. Consequently, the MIC and MBC values of DH5α is least (0.066 mg/ml and 0.083 mg/ml respectively) and B. subtilis is highest (0.15 mg/ml and 0.18 mg/ml respectively) among the tested bacterial strains. From our studies it is inferred that CuI NPs produce reactive oxygen species (ROS) in both gram negative and gram positive bacteria and it also causes ROS mediated DNA damage for the suppression of transcription as revealed by reporter gene assay. Probably ROS is formed on the surface of NPs of CuI in presence of amine functional groups of various biological molecules. Furthermore they induce membrane damage as determined by atomic force microscopy (AFM). Thus production of ROS and membrane damage are major mechanisms of the bactericidal activity of these NPs of CuI.
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422
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Sharma TK, Chopra A, Sapra M, Kumawat D, Patil SD, Pathania R, Navani NK. Green Synthesis and Antimicrobial Potential of Silver Nanoparticles. ACTA ACUST UNITED AC 2012. [DOI: 10.1080/19430892.2012.656040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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423
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Enhanced antibacterial activity of amino acids-functionalized multi walled carbon nanotubes by a simple method. Colloids Surf B Biointerfaces 2011; 92:196-202. [PMID: 22197225 DOI: 10.1016/j.colsurfb.2011.11.045] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 10/28/2011] [Accepted: 11/22/2011] [Indexed: 11/20/2022]
Abstract
Multi-walled carbon nanotubes (MWCNTs) were first functionalized by arginine and lysine under microwave radiation. Surface functionalization was confirmed by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and transmission electron microscopy (TEM). After the MWCNTs were functionalized by arginine and lysine, the antibacterial activity of all treated samples was increased significantly against all bacteria that were tested. Based on the observed minimum inhibitory concentration and radial diffusion assay, the sequence of antibacterial activity was MWCNTs-arginine>MWCNTs-lysine>pristine MWCNTs. The functionalized MWCNTs were especially effective against gram-negative bacteria (e.g., Escherichia coli and Salmonella typhimurium). Interestingly, the MWCNT samples were effective against the resistant strain Staphylococcos aureus. The enhanced antibacterial activity was attributed to electrostatic adsorption of bacteria membrane due to positive charges of the functional groups on MWCNTs surface. Since MWCNTs have lower cytotoxicity than single-walled carbon nanotubes, their functionalization with cationic amino acids could be a beneficial approach in the disinfection industry.
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