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1

SYNTHESIS OF SILVER NANOPARTICLES IN A CHITOSAN SOLUTION

100%

Modrzejewska Z., Zarzycki R., Sielski J.

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vol. 15

63 - 72

EN

In the present study silver nanoparticles were obtained using the ability of chitosan to form chelate compounds with metal ions and taking advantage of its reducing properties. The reduction process was conducted at the temperature 60°C or applying γ radiation from 60Co cobalt source. A preliminary characteristic which allows us to realize the size of formed silver nanoparticles was made on the basis of the measurements of UV absorption and dynamic light dispersion.

2

Silver nanoparticle accumulation by aquatic organisms – neutron activation as a tool for the environmental fate of nanoparticles tracing

88%

Asztemborska M., Jakubiak M., Książyk M., Stęborowski R., Polkowska-Motrenko H., Bystrzejewska-Piotrowska G.

Nukleonika

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2014

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vol. 59

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issue 4

169-173

EN

Water environments are noted as being some of the most exposed to the influence of toxic nanoparticles (NPs). Therefore, there is a growing need for the investigation of the accumulation and toxicity of NPs to aquatic organisms. In our studies neutron activation followed by gamma spectrometry and liquid scintillation counting were used for studying the accumulation of silver nanoparticles (AgNPs) by freshwater larvae of Chironomus and fish Danio rerio. The influence of exposition time, concentration and the source of nanoparticles on the efficiency of AgNP accumulation were studied. It was found that AgNPs are efficiently accumulated by Chironomid larvae for the first 30 hours of exposition; then, the amount of silver nanoparticles decreases. The silver content in larvae increases together with the NP concentration in water. Larvae which have accumulated AgNPs can be a source of nanoparticles for fish and certainly higher levels of Ag in the trophic chain. In comparison with water contamination, silver nanoparticles are more efficiently accumulated if fish are fed with AgNP-contaminated food. Finally, it was concluded that the applied study strategy, including neutron activation of nanoparticles, is very useful technique for tracing the uptake and accumulation of NPs in organisms

3

THE EFFECT OF A COMPOSITE CHITOSAN-SILVER(I) ION COATING ON THE CORROSION RESISTANCE OF THE COBALT-CHROMIUM-MOLYBDENUM ALLOY IN SALINE SOLUTION

75%

Łosiewicz B., Osak P., Kubisztal J.

Progress on Chemistry and Application of Chitin and its Derivatives

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2023

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vol. 28

75-88

EN

We determined the in vitro corrosion resistance of the composite chitosan-silver(I) [Ag(I)] ion coating on the cobalt-chromium-molybdenum (CoCrMo) dental alloy in a 0.9% sodium chloride (NaCl) solution at 37°C. We obtained the novel composite chitosan–Ag(I) ion coating by electrophoretic deposition at 20 V for 30 s at room temperature in a 2% (v/v) aqueous solution of acetic acid with 1 g dm–3 chitosan and 10 g dm–3 silver nitrate. We evaluated the chemical composition with energy dispersive spectroscopy and Fouriert-ransform infrared spectroscopy. We investigated surface topography and electronic properties with a scanning Kelvin probe. We determined the mechanism and kinetics of the electrochemical corrosion of the obtained coatings by electrochemical impedance spectroscopy. The Ag content in the composite chitosan–Ag(I) ion coating was 1.9 ± 1 wt.%. The cataphoretic co-deposition of chitosan and Ag(I) ions in an aqueous solution can be used to modify the CoCrMo alloy surface to obtain new coatings with antibacterial properties.

4

GOLD AND SILVER NANOPARTICLES IN Spirulina platensis BIOMASS FOR MEDICAL APPLICATION

51%

Kalabegishvili T., Murusidze I., Kirkesali E., Rcheulishvili A., Ginturi E., Kuchava N., Bagdavadze N., Gelagutashvili E., Frontasyeva M. V., Zinicovscaia I., Pavlov S. S., Dmitriev A. Y.

Ecological Chemistry and Engineering S

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2013

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vol. 20

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issue 4

621-631

EN

The synthesis of gold and silver nanoparticles by the blue-green algae Spirulina platensis for medical purposes was studied. A complex of optical and analytical methods was used in order to characterize produced nanoparticles. It was shown that the extracellular formation of metal nanoparticles of spherical shape with sizes in the range between 8 and 40 nm (the average size of 20-30 nm) takes place. The characteristics of gold and silver nanoparticles in the Spirulina biomass were compared. The role of biosorption processes in the synthesis of nanoparticles was estimated by using equilibrium dialysis. A positive influence of sonication on the process of microbial synthesis and yield of nanoparticles were demonstrated. The neutron activation analysis and the atomic absorption spectrometry were applied for characterizing the dynamics of gold and silver nanoparticles formation in the Spirulina platensis biomass. The neutron activation analysis was used for studying the elemental content of the Spirulina platensis biomass.

PL

Zbadano syntezę nanocząstek złota i srebra przez niebieskozielone glony Spirulina platensis, które są wykorzystywane do celów medycznych. Do scharakteryzowania wytworzonych nanocząstek zastosowano szereg metod optycznych i analitycznych. Wykazano, że zachodzi tworzenie pozakomórkowej, sferycznej nanocząstki o rozmiarach w zakresie od 8 do 40 nm (średnia wielkość 20-30 nm). Porównano charakterystyki nanocząstek złota i srebra wytworzonych w biomasie Spiruliny. Do oceny roli procesów biosorpcji w syntezie nanocząstek wykorzystano dializy równowagowe. Wykazano pozytywny wpływ ultradźwięków na procesy mikrobiologiczne i na wydajność syntezy nanocząstek. Do określenia dynamiki tworzenia nanocząsteczek złota i srebra w biomasie Spirulina platensis zastosowano neutronową analizę aktywacyjną i spektrometrię absorpcji atomowej. Stężenia pierwiastków w biomasie Spirulina platensis określono za pomocą neutronowej analizy aktywacyjnej

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2 Progress on Chemistry and Application of Chitin and its Derivatives

1 Ecological Chemistry and Engineering S

1 Nukleonika

1 2023

1 2014

1 2013

1 2010

1 Asztemborska M.

1 Bagdavadze N.

1 Bystrzejewska-Piotrowska G.

1 Dmitriev A. Y.

1 Frontasyeva M. V.

1 Gelagutashvili E.

1 Ginturi E.

1 Jakubiak M.

1 Kalabegishvili T.

1 Kirkesali E.

1 Książyk M.

1 Kubisztal J.

1 Kuchava N.

1 Modrzejewska Z.

1 Murusidze I.

1 Osak P.

1 Pavlov S. S.

1 Polkowska-Motrenko H.

1 Rcheulishvili A.

1 Sielski J.

1 Stęborowski R.

1 Zarzycki R.

1 Zinicovscaia I.

1 Łosiewicz B.

SYNTHESIS OF SILVER NANOPARTICLES IN A CHITOSAN SOLUTION

Silver nanoparticle accumulation by aquatic organisms – neutron activation as a tool for the environmental fate of nanoparticles tracing

THE EFFECT OF A COMPOSITE CHITOSAN-SILVER(I) ION COATING ON THE CORROSION RESISTANCE OF THE COBALT-CHROMIUM-MOLYBDENUM ALLOY IN SALINE SOLUTION

GOLD AND SILVER NANOPARTICLES IN Spirulina platensis BIOMASS FOR MEDICAL APPLICATION