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Spontaneous Transformation of Biomedical Polymeric Silver Salt into a Nanocomposite: Physical-Chemical and Antimicrobial Properties Dramatically Depend on the Initial Preparation State. Int J Mol Sci 2022; 23:ijms231810963. [PMID: 36142870 PMCID: PMC9501147 DOI: 10.3390/ijms231810963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 09/15/2022] [Accepted: 09/16/2022] [Indexed: 11/24/2022] Open
Abstract
An antimicrobial polyacrylic silver salt (freshly prepared, stored for one year and model-aged) was studied by physical–chemical techniques for nanoparticle detection. In all cases, this salt represents a composite of radical-enriched macromolecules and silver(0) nanoparticles. As time passed, the initial small spherical nanoparticles were converted into larger non-spherical silver nanoparticles. The initial highly water-soluble antimicrobial solid nanocomposite almost loses its solubility in water and cannot be used as an antimicrobial agent. Unlike insoluble solid silver polyacrylate, its freshly prepared aqueous solution retains a liquid-phase consistency after one year as well as pronounced antimicrobial properties. The mechanism of these spontaneous and model-simulated processes was proposed. These results have attracted attention for officinal biomedicinal silver salts as complex radical-enriched nanocomposite substances; they also indicate contrasting effects of silver polymeric salt storing in solid and solution forms that dramatically influence antimicrobial activity.
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Novikov MA, Titov EA, Sosedova LM, Rukavishnikov VS, Vokina VA, Lakhman OL. Comparative Assessment of Silver Nanocomposites' Biological Effects on the Natural and Synthetic Matrix. Int J Mol Sci 2021; 22:ijms222413257. [PMID: 34948053 PMCID: PMC8706262 DOI: 10.3390/ijms222413257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 11/29/2021] [Accepted: 12/08/2021] [Indexed: 11/21/2022] Open
Abstract
The aim of our investigation was to make a comparative assessment of the biological effects of silver nanoparticles encapsulated in a natural and synthetic polymer matrix. We carried out a comparative assessment of the biological effect of silver nanocomposites on natural (arabinogalactan) and synthetic (poly-1-vinyl-1,2,4-triazole) matrices. We used 144 three-month-old white outbred male rats, which were divided into six groups. Substances were administered orally for 9 days at a dose 500 μg/kg. Twelve rats from each group were withdrawn from the experiment immediately after nine days of exposure (early period), and the remaining 12 rats were withdrawn from the experiment 6 months after the end of the nine-day exposure (long-term period). We investigated the parietal–temporal area of the cerebral cortex using histological (morphological assessments of nervous tissue), electron microscopic (calculation of mitochondrial areas and assessment of the quality of the cell nucleus), and immunohistochemical methods (study of the expression of proteins regulating apoptosis bcl-2 and caspase 3). We found that the effect of the nanocomposite on the arabinogalactan matrix causes a disturbance in the nervous tissue structure, an increase in the area of mitochondria, a disturbance of the structure of nerve cells, and activation of the process of apoptosis.
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Khutsishvili SS, Ganenko TV, Sukhov BG. Formation and paramagnetic properties of manganese-containing bionanocomposites based on natural polysaccharide matrices. J Carbohydr Chem 2021. [DOI: 10.1080/07328303.2021.1990314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Spartak S. Khutsishvili
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Tat’yana V. Ganenko
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
| | - Boris G. Sukhov
- V. V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
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Modification of Arabinogalactan Isolated from Larix sibirica Ledeb. into Sulfated Derivatives with the Controlled Molecular Weights. Molecules 2021; 26:molecules26175364. [PMID: 34500801 PMCID: PMC8434177 DOI: 10.3390/molecules26175364] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/26/2021] [Accepted: 08/31/2021] [Indexed: 01/18/2023] Open
Abstract
The process of sulfation of arabinogalactan—a natural polysaccharide from Larix sibirica Ledeb.—with sulfamic acid in 1,4-dioxane using different activators has been studied for the first time. The dynamics of the molecular weight of sulfated arabinogalactan upon variation in the temperature and time of sulfation of arabinogalactan with sulfamic acid in 1,4-dioxane has been investigated. It has been found that, as the sulfation time increases from 10 to 90 min, the molecular weights of the reaction products grow due to the introduction of sulfate groups without significant destruction of the initial polymer and sulfation products. Sulfation at 95 °C for 20 min yields the products with a higher molecular weight than in the case of sulfation at 85 °C, which is related to an increase in the sulfation rate; however, during the further process occurring under these conditions, sulfation is accompanied by the destruction and the molecular weight of the sulfated polymer decreases. The numerical optimization of arabinogalactan sulfation process has been performed. It has been shown that the optimal parameters for obtaining a product with a high sulfur content are a sulfamic acid amount of 20 mmol per 1 g of arabinogalactan, a process temperature of 85 °C, and a process time of 2.5 h.
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Kuznetsova SA, Vasilyeva NY, Drozd NN, Mikhailenko MA, Shakhtshneider TP, Malyar YN, Kuznetsov BN, Chesnokov NV. Sulfated Derivatives of Arabinogalactan and Their Anticoagulant Activity. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1068162020070079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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6
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NonToxic Silver/Poly-1-Vinyl-1,2,4-Triazole Nanocomposite Materials with Antibacterial Activity. NANOMATERIALS 2020; 10:nano10081477. [PMID: 32731519 PMCID: PMC7466392 DOI: 10.3390/nano10081477] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/19/2020] [Accepted: 07/27/2020] [Indexed: 02/06/2023]
Abstract
Novel silver/poly-1-vinyl-1,2,4-triazole nanocomposite materials-possessing antimicrobial activity against Gram-positive and Gram-negative bacteria-have been synthesized and characterized in the solid state and aqueous solution by complex of modern physical-chemical and biologic methods. TEM-monitoring has revealed the main stages of microbial cell (E. coli) destruction by novel nanocomposite. The concept of direct polarized destruction of microbes by nanosilver proposed by the authors allows the relationship between physicochemical and antimicrobial properties of novel nanocomposites. At the same time, it was shown that the nanocomposite was nontoxic to the fibroblast cell culture. Thus, the synthesized nanocomposite combining antibacterial activity against Gram-positive and Gram-negative bacteria as well as the absence of toxic effects on mammalian cells is a promising material for the development of catheters, coatings for medical devices.
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Synthesis of selenium and silver nanobiocomposites and their influence on phytopathogenic bacterium Clavibacter michiganensis subsp. sepedonicus. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2052-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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8
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Lesnichaya MV, Sukhov BG, Aleksandrova GP, Gasilova ER, Vakul'skaya TI, Khutsishvili SS, Sapozhnikov AN, Klimenkov IV, Trofimov BA. Chiroplasmonic magnetic gold nanocomposites produced by one-step aqueous method using κ-carrageenan. Carbohydr Polym 2017; 175:18-26. [PMID: 28917855 DOI: 10.1016/j.carbpol.2017.07.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 07/12/2017] [Accepted: 07/13/2017] [Indexed: 01/14/2023]
Abstract
Novel water-soluble chiroplasmonic nanobiocomposites with directly varied gold content were synthesized by a one-step redox method in water using a biocompatible polysaccharide κ-carrageenan (industrial product from algae) as both reducing and stabilizing matrix. The influence of the reactants ratio, temperature, and pH on the reaction was studied and the optimal reaction parameters were found. The structure and the properties of composite nanomaterials were examined in solid state and aqueous solutions by using complementary physical-chemical methods X-ray diffraction analysis, transmission electron microscopy, spectroscopy of electron paramagnetic resonance, atomic absorption and optical spectroscopy, polarimetry including optical rotatory dispersion with registration of interphase-crossbred Cotton effect of a chiral polysaccharide matrix on plasmonic chromophore of gold nanoparticles, dynamic and static light scattering. The new perspective multi-purpose nanocomposites demonstrate a complex of chiroplasmonic and magnetic properties, imparted by both nanoparticles and radicals enriched chiral polysaccharide matrix.
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Affiliation(s)
- Marina V Lesnichaya
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia.
| | - Boris G Sukhov
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia
| | - Galina P Aleksandrova
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia
| | - Ekaterina R Gasilova
- Institute of Macromolecular Compounds, Russian Academy of Sciences, 31, Bolshoy pr., 199004, Saint-Petersburg, Russia
| | - Tamara I Vakul'skaya
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia
| | - Spartak S Khutsishvili
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia
| | - Anatoliy N Sapozhnikov
- A.P. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, 1a, Favorsky St., 664033, Irkutsk, Russia
| | - Igor V Klimenkov
- Limnological Institute, Siberian Branch, Russian Academy of Sciences, 3, Ulan-Batorskaya St., 664033, Irkutsk, Russia
| | - Boris A Trofimov
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1, Favorsky St., 664033, Irkutsk, Russia
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Parshina LN, Grishchenko LA, Larina LI, Novikova LN, Trofimov BA. Cross-coupling of propargylated arabinogalactan with 2-bromothiophene. Carbohydr Polym 2016; 150:82-8. [DOI: 10.1016/j.carbpol.2016.04.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/21/2016] [Accepted: 04/23/2016] [Indexed: 10/21/2022]
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10
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Shurygina IA, Shurygin MG, Dmitrieva LA, Fadeeva TV, Ganenko TV, Tantsyrev AP, Sapozhnikov AN, Sukhov BG, Trofimov BA. Bacterio- and lymphocytotoxicity of silver nanocomposite with sulfated arabinogalactan. Russ Chem Bull 2016. [DOI: 10.1007/s11172-015-1052-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Fernández JG, Almeida CA, Fernández-Baldo MA, Felici E, Raba J, Sanz MI. Development of nitrocellulose membrane filters impregnated with different biosynthesized silver nanoparticles applied to water purification. Talanta 2015; 146:237-43. [PMID: 26695258 DOI: 10.1016/j.talanta.2015.08.060] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 08/25/2015] [Accepted: 08/26/2015] [Indexed: 01/19/2023]
Abstract
Bactericidal water filters were developed. For this purpose, nitrocellulose membrane filters were impregnated with different biosynthesized silver nanoparticles. Silver nanoparticles (AgNPs) from Aspergillus niger (AgNPs-Asp), Cryptococcus laurentii (AgNPs-Cry) and Rhodotorula glutinis (AgNPs-Rho) were used for impregnating nitrocellulose filters. The bactericidal properties of these nanoparticles against Escherichia coli, Enterococcus faecalis and Pseudomona aeruginosa were successfully demonstrated. The higher antimicrobial effect was observed for AgNPs-Rho. This fact would be related not only to the smallest particles, but also to polysaccharides groups that surrounding these particles. Moreover, in this study, complete inhibition of bacterial growth was observed on nitrocellulose membrane filters impregnated with 1 mg L(-1) of biosynthesized AgNPs. This concentration was able to reduce the bacteria colony count by over 5 orders of magnitude, doing suitable for a water purification device.
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Affiliation(s)
- Jorge G Fernández
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina
| | - César A Almeida
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina
| | - Martín A Fernández-Baldo
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina
| | - Emiliano Felici
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina
| | - Julio Raba
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina
| | - María I Sanz
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina.
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12
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Bochek AM, Zabivalova NM, Gofman IV, Lebedeva MF, Popova EN, Lavrent’ev VK. Properties of composite films of methylcellulose with arabinogalactan. POLYMER SCIENCE SERIES A 2015. [DOI: 10.1134/s0965545x15040021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Papkina AV, Perfileva AI, Zhivet’yev MA, Borovskii GB, Graskova IA, Klimenkov IV, Lesnichaya MV, Sukhov BG, Trofimov BA. Complex effects of selenium-arabinogalactan nanocomposite on both phytopathogen Clavibacter michiganensis subsp. sepedonicus and potato plants. ACTA ACUST UNITED AC 2015. [DOI: 10.1134/s1995078015030131] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Sukhov BG, Pogodaeva NN, Kuznetsov SV, Kupriyanovich YN, Yurinova GV, Selivanova DS, Pristavka AA, Dzhioev YP, Popkova SM, Rakova EB, Medvedeva PA, Trofimov BA. Prebiotic effect of native noncovalent arabinogalactan—flavonoid conjugates on bifidobacteria. Russ Chem Bull 2015. [DOI: 10.1007/s11172-014-0718-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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15
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Rodionova LV, Shurygina IA, Sukhov BG, Popova LG, Shurygin MG, Artem’ev AV, Pogodaeva NN, Kuznetsov SV, Gusarova NK, Trofimov BA. Nanobiocomposite based on selenium and arabinogalactan: Synthesis, structure, and application. RUSS J GEN CHEM+ 2015. [DOI: 10.1134/s1070363215020218] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Ganenko TV, Tantsyrev AP, Sapozhnikov AN, Khutsishvili SS, Vakulskaya TI, Fadeeva TV, Sukhov BG, Trofimov BA. Nanocomposites of silver with arabinogalactan sulfate: Preparation, structure, and antimicrobial activity. RUSS J GEN CHEM+ 2015. [DOI: 10.1134/s1070363215020206] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Grischenko LA, Parshina LN, Larina LI, Novikova LN, Trofimov BA. Modification of arabinogalactan propargyl ethers by triazolyl functions. Carbohydr Polym 2015; 115:294-304. [PMID: 25439898 DOI: 10.1016/j.carbpol.2014.08.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 08/11/2014] [Accepted: 08/11/2014] [Indexed: 11/16/2022]
Abstract
Polysaccharide arabinogalactan (AG) has been modified by triazolyl functions via the copper-catalyzed 1,3-dipolar addition of azides to propargyl ethers. A range of new AG triazolo derivatives bearing benzyl, 4-vinylbenzyl, 1-naphthylmethyl, (1-vinylimidazol-2-yl)methyl, (1-ethylimidazol-2-yl)methyl, (1-vinylbenzimidazol-2-yl)methyl, allyl, carboxymethyl (as Na-salt) substituents is prepared by "one-pot" approach from organic azides generated in situ and AG propargyl ethers. The latter (degree of substitution 2.0-2.2) are converted into 1,2,3-triazolo AGs in DMSO/water mixture in the presence of CuSO4·5H2O/sodium ascorbate/Et3N in 82-94% yields and with 60-100% conversion.
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Affiliation(s)
- Lyudmila A Grischenko
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Lidiya N Parshina
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Lyudmila I Larina
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Lyubov N Novikova
- Irkutsk State Agricultural Academy, Molodezhny Settlement, 664038 Irkutsk, Russia
| | - Boris A Trofimov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia.
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Gao S, Ge W, Zhao C, Cheng C, Jiang H, Wang X. Novel conjugated Ag@PNIPAM nanocomposites for an effective antibacterial wound dressing. RSC Adv 2015. [DOI: 10.1039/c5ra01199j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It is well known that nanosilver or silver ions could act as an effective antibacterial agent without the development of bacterial resistance but long term exposure may induce in vivo toxicity.
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Affiliation(s)
- Shengping Gao
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Wei Ge
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Chunqiu Zhao
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Chuansheng Cheng
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
- School of Chemistry and Chemical Engineering
| | - Hui Jiang
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Xuemei Wang
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
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Lesnichaya MV, Sukhov BG, Sapozhnikov AN, Safronova LA, Evseenko OV, Ilyash VM, Podgorskii VS, Trofimov BA. New nanobiocomposites of ammonium magnesium phosphate and carrageenan as efficient prebiotics. DOKLADY CHEMISTRY 2014. [DOI: 10.1134/s0012500814080023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Medvedeva AS, Safronova LP, Ganenko TV, Sukhov BG, Larina LI, Kon’shina TM, Kotegov VP. Synthesis of water-soluble bioconjugate piroxicam—arabinogalactan sulfate. Russ Chem Bull 2014. [DOI: 10.1007/s11172-014-0711-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Grischenko LA, Parshina LN, Kanitskaya LV, Larina LI, Novikova LN, Trofimov BA. Propargylation of arabinogalactan with propargyl halides—a facile route to new functionalized biopolymers. Carbohydr Res 2013; 376:7-14. [DOI: 10.1016/j.carres.2013.04.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 04/25/2013] [Accepted: 04/26/2013] [Indexed: 10/26/2022]
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22
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Nanoscalic silver possesses broad-spectrum antimicrobial activities and exhibits fewer toxicological side effects than silver sulfadiazine. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2012; 8:478-88. [DOI: 10.1016/j.nano.2011.07.005] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 05/21/2011] [Accepted: 07/21/2011] [Indexed: 11/19/2022]
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23
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Study of Antibacterial Efficacy of Hybrid Chitosan-Silver Nanoparticles for Prevention of Specific Biofilm and Water Purification. ACTA ACUST UNITED AC 2011. [DOI: 10.1155/2011/693759] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Antibacterial efficacy of silver nanoparticles (Ag NPs) deposited alternatively layer by layer (LBL) on chitosan polymer in the form of a thin film over a quartz plate and stainless steel strip has been studied. An eight-bilayer chitosan/silver (Cs/Ag)8 hybrid was prepared having a known concentration of silver. Techniques such as UV-visible spectroscopy, inductively coupled plasma optical emission spectroscopy (ICP-OES), and atomic force microscopy (AFM) were carried out to understand and elucidate the physical nature of the film. Gram-negative bacteria, Escherichia coli (E. coli), were used as a test sample in saline solution for antibacterial studies. The growth inhibition at different intervals of contact time and, more importantly, the antibacterial properties of the hybrid film on repeated cycling in saline solution have been demonstrated. AFM studies are carried out for the first time on the microbe to know the morphological changes affected by the hybrid film. The hybrid films on aging (3 months) are found to be as bioactive as before. Cytotoxicity experiments indicated good biocompatibility. The hybrid can be a promising bioactive material for the prevention of biofilms specific to E. coli and in purification of water for safe drinking.
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