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Silver nanoparticles deposited on calcium hydrogenphosphate – silver phosphate matrix; biological activity of the composite

Szmuc K., Kus-Liskiewicz M., Szyller Ł., Szmuc D., Stompor M., Zawlik I., Ruman T., Wołowiec S., Cebulski J.

Polish Journal of Chemical Technology

2019

Vol. 21, nr 2

6--13

The composite containing nanosilver uniformly deposited on matrix composed of CaHPO4 x 2H2 O (brushite, ca 89 mass %), CaHPO4 (monteonite, ca 9.5 mass%), and Ag3 PO4 (0.5 mas%) was obtained by addition of calcium nitrate and silver nitrate aqueous solution at 30:1 Ca:Ag molar ratio into excess of (NH4 )2 PO4 solution at pH 5.0 – 5.5. The isolated solid was characterized by STEM, XRD, and LDI mass spectrometry. It has been found that nanosilver was uniformly distributed within composite as <10 nm diameter sized nanoparticles. Determination of silver by AAS showed that 60% of silver is present as Ag(0) nanoparticles, the present as matrix Ag3 PO4 as identified by XRD method. The composite showed strong growth inhibition in E. coli and P. aeruginosa strains, and moderate towards S. aureus. The C. albicans cells were the most resistant to the tested material, although still composite was moderately cytostatic for the yeast.

The Titanium(IV), Iron(III) and Manganese(II) Complexes of Chrysin-4'-sulfonate

Pusz J., Nitka B., Wołowiec S.

Polish Journal of Chemistry

2001

Vol. 75, nr 6

795-801

The chrysin-4_-sulfonic acid and its sodium salt (Nachsa-4_) have been synthesized and characterized by 1H and 13C NMR spectroscopy. New complexes of Ti(IV), Mn(II) and Fe(III) ions with chsa-4_ anion in solid state were obtained. Their composition and some physicochemical properties were studied by thermogravimetric analysis, UV/Vis, infrared spectroscopy and magnetic measurements. The structure of the compounds was elucidated on the basis of the results obtained.