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Kulakovich O, Scherbovich A, Koktysh I, Melnikova Y, Ramanenka A, Gaponenko S, Maskevich S. Optical and topographic characteristics of silver films deposited from a colloidal solution on polyelectrolytes for IgG-FITC fluorescence analysis. Z PHYS CHEM 2022. [DOI: 10.1515/zpch-2021-3110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
The optimization of the fluorescence enhancement factor of the IgG-FITC conjugate as an immunofluorescent marker, depending on the optical and topographic parameters of the colloidal silver film on the surface of a polystyrene plate for immunoassay, was carried out for the first time, and the factors effecting the enhancement were identified. By means of time-resolved spectroscopy as well as by detection the relative concentrations of IgG-FITC adsorbed on the solid phase with enzyme-linked immunoassay, it was shown that fluorescence enhancement in the presence of silver nanoparticles is a resonance process associated with plasmon effects. The most important parameters correlating with the fluorescence enhancement factor are the optical density value at the wavelength of excitation and emission of the fluorophore. The maximum enhancement factor of 10.2 times was obtained for Ag films with the highest optical density.
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Affiliation(s)
- Olga Kulakovich
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus , 68-2 Nezaliezhnasci Avenue , 220072 , Minsk , Republic of Belarus
| | - Anastasia Scherbovich
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus , 68-2 Nezaliezhnasci Avenue , 220072 , Minsk , Republic of Belarus
- Belarusian State University, International Sakharov Environmental Institute of BSU , Dolgobrodskaya Str. , Minsk 220070 , Republic of Belarus
| | - Irina Koktysh
- Belarusian State University, International Sakharov Environmental Institute of BSU , Dolgobrodskaya Str. , Minsk 220070 , Republic of Belarus
| | - Yanina Melnikova
- Belarusian State University, International Sakharov Environmental Institute of BSU , Dolgobrodskaya Str. , Minsk 220070 , Republic of Belarus
| | - Andrei Ramanenka
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus , 68-2 Nezaliezhnasci Avenue , 220072 , Minsk , Republic of Belarus
| | - Sergey Gaponenko
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus , 68-2 Nezaliezhnasci Avenue , 220072 , Minsk , Republic of Belarus
| | - Sergey Maskevich
- Belarusian State University, International Sakharov Environmental Institute of BSU , Dolgobrodskaya Str. , Minsk 220070 , Republic of Belarus
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Brahmkhatri VP, Chandra K, Dubey A, Atreya HS. An ultrastable conjugate of silver nanoparticles and protein formed through weak interactions. NANOSCALE 2015; 7:12921-12931. [PMID: 26166696 DOI: 10.1039/c5nr03047a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In recent years, silver nanoparticles (AgNPs) have attracted significant attention owing to their unique physicochemical, optical, conductive and antimicrobial properties. One of the properties of AgNPs which is crucial for all applications is their stability. In the present study we unravel a mechanism through which silver nanoparticles are rendered ultrastable in an aqueous solution in complex with the protein ubiquitin (Ubq). This involves a dynamic and reversible association and dissociation of ubiquitin from the surface of AgNP. The exchange occurs at a rate much greater than 25 s(-1) implying a residence time of <40 ms for the protein. The AgNP-Ubq complex remains stable for months due to steric stabilization over a wide pH range compared to unconjugated AgNPs. NMR studies reveal that the protein molecules bind reversibly to AgNP with an approximate dissociation constant of 55 μM and undergo fast exchange. At pH > 4 the positively charged surface of the protein comes in contact with the citrate capped AgNP surface. Further, NMR relaxation-based experiments suggest that in addition to the dynamic exchange, a conformational rearrangement of the protein takes place upon binding to AgNP. The ultrastability of the AgNP-Ubq complex was found to be useful for its anti-microbial activity, which allowed the recycling of this complex multiple times without the loss of stability. Altogether, the study provides new insights into the mechanism of protein-silver nanoparticle interactions and opens up new avenues for its application in a wide range of systems.
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Zhang R, Kang Y, Xie B. Assembly and antibacterial activity of horizontally oriented silver nanoplates. J Appl Polym Sci 2015. [DOI: 10.1002/app.42070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Renjie Zhang
- National Engineering Technology Research Center for Colloidal Materials; Shandong University; Jinan 250199 People's Republic of China
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education; Shandong University; Jinan 250199 People's Republic of China
- Key Laboratory of Special Functional Aggregated Materials of the Ministry of Education; Shandong University; Jinan 250199 People's Republic of China
| | - Yongqing Kang
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education; Shandong University; Jinan 250199 People's Republic of China
| | - Beibei Xie
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education; Shandong University; Jinan 250199 People's Republic of China
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Totally Ecofriendly Synthesis of Silver Nanoparticles from Aqueous Dissolutions of Polysaccharides. INT J POLYM SCI 2013. [DOI: 10.1155/2013/436021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In this contribution, a totally ecofriendly synthesis of silver nanoparticles from aqueous dissolution of polysaccharides is reported. The synthesis of nanoparticles was performed using aqueous dissolutions of silver nitrate (AgNO3) and carboxymethyl-cellulose (CMC) as both reducing and stabilization agent and using different AgNO3 : CMC weight ratios. Resultant yellowish to reddish dispersions were characterized by means of transmission electron microscopy and their related techniques, such as bright field and Z-contrast imaging and electron diffraction, as well as ultraviolet-visible and infrared spectroscopic techniques. The experimental evidence suggests that the morphology and particle size distribution of the silver nanoparticles depend on the AgNO3 : CMC weight ratio. This feature seems to be related to the stabilization given by the CMC matrix, which, according to our experimental findings, is steric in nature. Regarding such experimental evidence, a synthesis mechanism in which CMC acts as stabilizer and reducing agent is proposed.
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Machado G, Feil AF, Migowski P, Rossi L, Giovanela M, Crespo JDS, Miotti L, Sortica MA, Grande PL, Pereira MB, Correia RRB. Structural control of gold nanoparticles self-assemblies by layer-by-layer process. NANOSCALE 2011; 3:1717-1723. [PMID: 21445414 DOI: 10.1039/c0nr01023e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work presents a novel way to introduce gold nanoparticles (Au NPs) in a multilayer polymer produced by the layer-by-layer (LbL) assembling technique. The technique chosen shows that, depending on the pH used, different morphological structures can be obtained from monolayer or bilayer Au NPs. The MEIS and RBS techniques allowed for the modelling of the interface polymer-NPs, as well as the understanding of the interaction of LbL system, when adjusting the pH in weak polyelectrolytes. The process reveals that the optical properties of multilayer systems could be fine-tuned by controlling the addition of metallic nanoparticles, which could also modify specific polarization responses.
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Affiliation(s)
- Giovanna Machado
- Centro de Tecnologias Estratégica do Nordeste-CETENE, Recife, PE, Brazil.
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