Chitosan/silver nanocomposites: Synergistic antibacterial action of silver nanoparticles and silver ions

Kumar-Krishnan, Siva; Prokhorov, E.; Hernández‐Iturriaga, Montserrat; Mota‐Morales, Josué D.; Vázquez‐Lepe, Milton; Kovalenko, Yuriy; Sánchez, Isaac C.; Luna‐Bárcenas, Gabriel

doi:10.1016/j.eurpolymj.2015.03.066

Cited by 226 publications

(100 citation statements)

References 70 publications

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“…44 There is a range of pH near neutral condition for the growth of the most bacteria that do not affect the rate of growth and survival of the microorganisms, though this discussion involving the antimicrobial action of chitosan solubilized in HAc is rare. 21,45 The pH of the original aqueous suspension of chitosan in HAc 1.0% v/v, was adjusted with 1.0 mol L -1 NaOH aqueous solution, by adding dropwise under mechanical stirring. Figure 1 presents the UV-Vis spectra of these aqueous suspensions in different pH for monitoring the threshold of the chitosan solubilization.…”

Section: Resultsmentioning

confidence: 99%

Synergism in the Antibacterial Action of Ternary Mixtures Involving Silver Nanoparticles, Chitosan and Antibiotics

Brasil¹,

Filgueiras²,

Campos³

et al. 2018

J. Braz. Chem. Soc.

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The investigations of the antibacterial actions, observed in ternary associations involving silver nanoparticles (AgNPs), chitosan and the antibiotics azithromycin (AZ), levofloxacin (LE) or tetracycline (TE), against Gram-negative and Gram-positive bacterial strains, were performed by in vitro antimicrobial susceptibility testing and checkerboard assays. The pH impact in the culture medium was carefully discarded, but preserving the best conditions for solubilizing chitosan. The synergistic antibacterial effects were observed in the most combinations of AgNPs, chitosan and antibiotic, leading to a reduction from 37 to 97% in the minimum inhibitory concentration of the drugs. The mechanisms for the enhanced antimicrobial effects were proposed based on the investigations of the adsorptions of the drugs on the silver surfaces through surface-enhanced Raman scattering (SERS) spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Synergism in the Antibacterial Action of Ternary Mixtures Involving Silver Nanoparticles, Chitosan and Antibiotics

Brasil¹,

Filgueiras²,

Campos³

et al. 2018

J. Braz. Chem. Soc.

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“…This is due to their extremely large surface area, which provides better contact with microorganisms 49 and also the possibility of the nano silver particles not only interacting with the surface of membrane, but can also penetrate inside the bacteria. 50 Furthermore, according to various literatures and the standard antibacterial test "SNV 195920-1992", 51,52 specimens showing more than 1 mm microbial zone inhibition can be considered as good antibacterial agents. 4,23,51 Hence, the PEG stabilized nano silver particles synthesized from ball mill process can be considered as excellent antibacterial agents and has been proved to, effectively, work on the inactivation of the two bacteria tested.…”

Section: Antibacterial Studiesmentioning

confidence: 99%

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Jayaramudu

Raghavendra

Varaprasad

et al. 2015

J of Applied Polymer Sci

115

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Nano silver particles with an average mean crystallite size of between 10 and 12 nm were synthesized from different molecular weights of poly(ethylene glycol) as a stabilizing agents, through solid state oxidation of silver nitrate using a higher energy planetary ball mill. Ultraviolet-Visible spectra were used to confirm the synthesis of nano silver particles. The surface plasmon resonance bands were observed around 410 nm. Fourier transformed infrared spectrum, X-ray diffraction, and transmission electronic microscopy techniques were used to characterize the nano silver particles synthesized. Thermal stability was determined using thermogravimetic analysis and the elemental composition of the sample was determined by energy dispersive X-ray analysis. The nano silver particles synthesized, exhibited very good antibacterial activity against Gram-positive bacteria (Bacillus) and Gram-negative bacteria (Pseudomonas aeruginosa). Based on the obtained results, it was additionally explored that the size and the stabilization of the nano silver particles synthesized, strongly depend on the molecular weight of poly(ethylene glycol).

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“…Figure (c) shows two split peaks at 367.5 eV and 373.6 eV binding energy for the Ag/RGO/CS colloid, which can be assigned to the spin−orbit coupling of Ag (3d5/2 and 3d3/2). This proves clearly that silver is present only in metallic form, indicating the formation of AgNPs in the nanocomposite colloid . The N1 s peak at 400.0 eV is attributed to amine or amide groups of CS in RGO/CS .…”

Section: Resultsmentioning

confidence: 79%

Facile preparation of silver/reduced graphene oxide/chitosan colloid and application of the nanocomposite in antibacterial and catalytic activity

Guo

Yin

et al. 2018

Polymer International

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Reduced graphene oxide (RGO) decorated with silver nanoparticles (AgNPs) was synthesized by a facile solution‐based approach in chitosan (CS) solution. The morphology and elemental composition of as‐prepared Ag/RGO/CS colloid were characterized by SEM and energy dispersive X‐ray spectroscopy, respectively. TEM images show that most of the AgNPs are uniformly dispersed in the CS matrix while the other nanoparticles are decorated on the RGO nanosheets. XRD indicates that the interlayer distance of RGO is between 0.34 and 1.87 nm while the diameter of face‐centered cubic AgNPs is no more than 30 nm. Fourier transform infrared spectroscopy of the Ag/RGO/CS colloid confirms the formation of AgNPs and RGO. X‐ray photoelectron spectroscopy proves that both the Ag − O bond and the C − N bond exist in the nanocomposite. Antimicrobial assays were performed using the most common species of Gram bacteria. The inhibitory effect indicates that the incorporation of AgNPs and RGO significantly improves the antimicrobial activity of CS colloid. In addition, the nanocomposite colloid exhibits significant catalytic activity toward the reduction of 4‐nitrophenol by NaBH4. © 2018 Society of Chemical Industry

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Chitosan/silver nanocomposites: Synergistic antibacterial action of silver nanoparticles and silver ions

Cited by 226 publications

References 70 publications

Synergism in the Antibacterial Action of Ternary Mixtures Involving Silver Nanoparticles, Chitosan and Antibiotics

Synergism in the Antibacterial Action of Ternary Mixtures Involving Silver Nanoparticles, Chitosan and Antibiotics

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Facile preparation of silver/reduced graphene oxide/chitosan colloid and application of the nanocomposite in antibacterial and catalytic activity

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