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Advances in Nano Research
  Volume 7, Number 2, March 2019, pages 125-134

The relationship between precursor concentration and antibacterial activity of biosynthesized Ag nanoparticles
Matej Baláž, Ĺudmila Balážová, Mária Kováčová, Nina Daneu, Aneta Salayová, Zdenka Bedlovičová and Ĺudmila Tkáčiková

Abstract     [Full Text]
    The Origanum vulgare L.-mediated synthesis of Ag nanoparticles was successfully realized within the present study. Various concentrations of the AgNO3 used as a silver precursor (1, 2.5, 5, 10 and 100 mM) were used. Very rapid formation of Ag nanoparticles was observed, as only minutes were necessary for the completion of the reaction. With the increasing concentration, red shift of the surface plasmon resonance peak was observed in the Vis spectra. According to photon cross-correlation spectroscopy results, the finest grain size distribution was obtained for the 2.5 mM sample. The transmission electron microscopy analysis of this sample has shown bimodal size distribution with larger crystallites with 100 nm size and smaller around 10 nm. The antibacterial activity was also the best for this sample so the positive correlation between good grain size distribution and antibacterial activity was found. The in-depth discussion of antibacterial activity with related works from the materials science point of view is provided, namely emphasizing the role of effective nanoparticles distribution within the plant extract or matrix. The antibacterial activity seems to be governed by both content of Ag nanoparticles and their effective distribution. This work contributes to still expanding environmentally acceptable field of green synthesis of silver nanoparticles.
Key Words
    silver nanoparticles; green synthesis; antibacterial activity; Origanum
(1) Matej Baláž, Mária Kováčová:
Department of Mechanochemistry, Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia;
(2) Ĺudmila Balážová, Mária Kováčová:
Department of Pharmacognosy and Botany, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181 Košice, Slovakia;
(3) Nina Daneu:
Advanced Materials Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;
(4) Aneta Salayová, Zdenka Bedlovičová:
Department of Chemistry, Biochemistry and Biophysics, Institute of Pharmaceutical Chemistry, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181 Košice, Slovakia;
(5) Ĺudmila Tkáčiková:
Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181 Košice, Slovakia.

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