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Ballottin D, Fulaz S, Souza ML, Corio P, Rodrigues AG, Souza AO, Gaspari PM, Gomes AF, Gozzo F, Tasic L. Elucidating Protein Involvement in the Stabilization of the Biogenic Silver Nanoparticles. NANOSCALE RESEARCH LETTERS 2016; 11:313. [PMID: 27356560 PMCID: PMC4927534 DOI: 10.1186/s11671-016-1538-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/24/2016] [Indexed: 05/18/2023]
Abstract
Silver nanoparticles (AgNPs) have been broadly used as antibacterial and antiviral agents. Further, interests for green AgNP synthesis have increased in recent years and several results for AgNP biological synthesis have been reported using bacteria, fungi and plant extracts. The understanding of the role and nature of fungal proteins, their interaction with AgNPs and the subsequent stabilization of nanosilver is yet to be deeply investigated. Therefore, in an attempt to better understand biogenic AgNP stabilization with the extracellular fungal proteins and to describe these supramolecular interactions between proteins and silver nanoparticles, AgNPs, produced extracellularly by Aspergillus tubingensis-isolated as an endophytic fungus from Rizophora mangle-were characterized in order to study their physical characteristics, identify the involved proteins, and shed light into the interactions among protein-NPs by several techniques. AgNPs of around 35 nm in diameter as measured by TEM and a positive zeta potential of +8.48 mV were obtained. These AgNPs exhibited a surface plasmon resonance (SPR) band at 440 nm, indicating the nanoparticles formation, and another band at 280 nm, attributed to the electronic excitations in tryptophan, tyrosine, and/or phenylalanine residues in fungal proteins. Fungal proteins were covalently bounded to the AgNPs, mainly through S-Ag bonds due to cysteine residues (HS-) and with few N-Ag bonds from H2N- groups, as verified by Raman spectroscopy. Observed supramolecular interactions also occur by electrostatic and other protein-protein interactions. Furthermore, proteins that remain free on AgNP surface may perform hydrogen bonds with other proteins or water increasing thus the capping layer around the AgNPs and consequently expanding the hydrodynamic diameter of the particles (~264 nm, measured by DLS). FTIR results enabled us to state that proteins adsorbed to the AgNPs did not suffer relevant secondary structure alteration upon their physical interaction with the AgNPs or when covalently bonded to them. Eight proteins in the AgNP dispersion were identified by mass spectrometry analyses. All these proteins are involved in metabolic pathways of the fungus and are important for carbon, phosphorous and nitrogen uptake, and for the fungal growth. Thereby, important proteins for fungi are also involved in the formation and stabilization of the biogenic AgNPs.
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Affiliation(s)
- Daniela Ballottin
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
- NanoBioss, SisNano, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Stephanie Fulaz
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Michele L Souza
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
- Instituto de Ciências Exatas, Universidade Federal Fluminense, Volta Redonda, RJ, Brazil
| | - Paola Corio
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | | | - Ana O Souza
- Laboratório de Bioquímica e Biofísica, Instituto Butantan, São Paulo, SP, Brazil
| | - Priscyla M Gaspari
- Laboratório de Nanobiotecnologia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Riberão Preto, SP, Brazil
| | - Alexandre F Gomes
- Laboratório Dalton, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Fábio Gozzo
- Laboratório Dalton, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Ljubica Tasic
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil.
- NanoBioss, SisNano, Universidade Estadual de Campinas, Campinas, SP, Brazil.
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Liu Y, Lee DY, Monteux C, Crosby AJ. Hyperbranched polymer structures via flexible blade flow coating. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23952] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yujie Liu
- Polymer Science and EngineeringUniversity of Massachusetts Amherst120 Governors DriveAmherst Massachusetts01003
| | - Dong Yun Lee
- Polymer Science and EngineeringUniversity of Massachusetts Amherst120 Governors DriveAmherst Massachusetts01003
| | - Cécile Monteux
- PPMD/SIMM, UMR 7615 CNRS‐ESPCI‐Université Pierre Et Marie Curie, ESPCI10 Rue VauquelinParis75005 France
| | - Alfred J. Crosby
- Polymer Science and EngineeringUniversity of Massachusetts Amherst120 Governors DriveAmherst Massachusetts01003
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Farcau C, Potara M, Leordean C, Boca S, Astilean S. Reliable plasmonic substrates for bioanalytical SERS applications easily prepared by convective assembly of gold nanocolloids. Analyst 2014; 138:546-52. [PMID: 23171872 DOI: 10.1039/c2an36440a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The ability to easily prepare Surface Enhanced Raman Scattering (SERS) substrates by the assembly of chemically synthesized gold nanocolloids is of great interest for the advancement of SERS-based optical detection and identification of molecular species of biological or chemical interest, pollutants or warfare agents. In this work we employ three very simple strategies, which can be implemented in any laboratory without the need for specialized equipment, to prepare assemblies of citrate-stabilized spherical gold colloids: (i) drop-coating, which induces the assembly of colloids in so-called coffee rings; (ii) a simplified variant of convective self-assembly (CSA), based on water evaporation in a constrained geometry, which yields highly uniform strips of nanoparticles (NP); (iii) assembly onto chemically functionalized glass surfaces which yields randomly assembled colloids and colloidal clusters. The SERS properties of the resulting colloidal assemblies are comparatively evaluated under multiple excitation lines with p-aminothiophenol (pATP) as a model Raman scatterer. The NP strips obtained by CSA prove to be SERS-active both in the visible and NIR and possess a highly uniform SERS response as demonstrated by spectra at individually selected sites and by confocal SERS mapping. Further it is shown that these NP strips are effective for the detection of cytosine, a DNA component, and for multi-analyte SERS detection. These results, showing how an efficient SERS substrate can be obtained by a very simple assembly method from easy-to-synthesize colloidal gold NP, can have an impact on the development of analytical SERS applications.
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Affiliation(s)
- Cosmin Farcau
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research in Bio-Nano-Sciences, Faculty of Physics, Babes-Bolyai University, 42 Treboniu Laurian, 400271 Cluj-Napoca, Romania.
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Amiens C, Chaudret B, Ciuculescu-Pradines D, Collière V, Fajerwerg K, Fau P, Kahn M, Maisonnat A, Soulantica K, Philippot K. Organometallic approach for the synthesis of nanostructures. NEW J CHEM 2013. [DOI: 10.1039/c3nj00650f] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Farcau C, Sangeetha NM, Decorde N, Astilean S, Ressier L. Microarrays of gold nanoparticle clusters fabricated by Stop&Go convective self-assembly for SERS-based sensor chips. NANOSCALE 2012; 4:7870-7877. [PMID: 23149550 DOI: 10.1039/c2nr32781c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
SERS substrates fabricated from chemically synthesized nanoparticles (NPs) offer a distinct advantage of localizing and enhancing the electromagnetic fields by facile tuning of NP size, shape and interparticle distances. In this report, two-dimensional arrays of micrometre-sized clusters of gold nanoparticles protected by (i) sodium citrate and (ii) tris(2,4-dimethyl-5-sulfonatophenyl)phosphine (TDSP) ligands were directly assembled from colloidal suspensions onto flat, non-patterned substrates by discontinuous ('Stop&Go') convective self-assembly. The micrometric spacing between the NP clusters makes it easy to address them individually by confocal Raman microscopy. The packing of the gold NPs within these clusters with interparticle spacings of the order of nanometres leads to an optical response dominated by coupled surface plasmon resonances, and favours a strong enhancement of electromagnetic fields useful for surface enhanced Raman scattering (SERS). These NP clusters make very uniform SERS substrates, with reproducible SERS responses from cluster to cluster. The potential of these NP clusters for optical biosensing is demonstrated by the SERS detection of a biologically relevant molecule, cytosine, adsorbed onto the NP clusters. The presented results are promising for designing an original class of nanoparticle-based SERS microarrays. The new paradigm of convective self-assembly could be exploited generally for the patterning of various other types of colloidal micro- and nano-objects, such as semiconducting NPs, magnetic NPs, bacteria or proteins.
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Affiliation(s)
- Cosmin Farcau
- Babes-Bolyai University, Faculty of Physics, Institute for Interdisciplinary Research in Bio-Nano-Sciences, 1 M. Kogalniceanu, 400084 Cluj-Napoca, Romania
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Farcau C, Sangeetha NM, Moreira H, Viallet B, Grisolia J, Ciuculescu-Pradines D, Ressier L. High-sensitivity strain gauge based on a single wire of gold nanoparticles fabricated by stop-and-go convective self-assembly. ACS NANO 2011; 5:7137-43. [PMID: 21819134 DOI: 10.1021/nn201833y] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
High-sensitivity strain gauges based on single wires of close-packed 14 nm colloidal gold nanoparticles are obtained by a novel variant of convective self-assembly (CSA). This CSA mode named stop-and-go CSA enables the fabrication of nanoparticle wires only a few micrometers wide, separated by distances that can be easily tuned over tens to hundreds of micrometers. Nanoparticle wires are obtained in a single step by direct deposition of nanoparticles from suspensions onto flexible polyethylene terephthalate films, without any lithographic prepatterning. When connected between two electrodes, such single nanoparticle wires function as miniature resistive strain gauges. The high sensitivity, repeatability, and robustness demonstrated by these single-wire strain gauges make them extremely promising for integration into micro-electromechanical systems or for high-resolution strain mapping.
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Affiliation(s)
- Cosmin Farcau
- Université de Toulouse, LPCNO, INSA-CNRS-UPS, 135 Avenue de Rangueil, Toulouse, 31077, France
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Siffalovic P, Chitu L, Vegso K, Majkova E, Jergel M, Weis M, Luby S, Capek I, Keckes J, Maier GA, Satka A, Perlich J, Roth SV. Towards strain gauges based on a self-assembled nanoparticle monolayer--SAXS study. NANOTECHNOLOGY 2010; 21:385702. [PMID: 20739738 DOI: 10.1088/0957-4484/21/38/385702] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An in situ small-angle x-ray scattering study of the nanoparticle displacement in a self-assembled monolayer as a function of a supporting membrane strain is presented. The average nanoparticle spacing is 6.7 nm in the unstrained state and increases in the applied force direction, following linearly the membrane strain which reaches the maximum value of 11%. The experimental results suggest a continuous mutual shift of the nanoparticles and their gradual separation with the growing stress rather than nanoparticle islands formation. No measurable shift of the nanoparticles was observed in the direction perpendicular to the applied stress.
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Affiliation(s)
- P Siffalovic
- Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia.
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