title: Green synthesis and antibacterial effects of aqueous colloidal solutions of silver nanoparticles using camomile terpenoids as a combined reducing and capping agent.
abstract: Green synthesis method using camomile extract was applied to synthesize silver nanoparticles to tune their antibacterial properties merging the synergistic effect of camomile and Ag. Scanning transmission electron microscopy revealed that camomile extract (CE) consisted of porous globular nanometer sized structures, which were a perfect support for Ag nanoparticles. The Ag nanoparticles synthesized with the camomile extract (AgNPs/CE) of 7 nm average sizes, were uniformly distributed on the CE support, contrary to the pure Ag nanoparticles synthesized with glucose (AgNPs/G), which were over 50 nm in diameter and strongly agglomerated. The energy dispersive X-ray spectroscopy chemical analysis showed that camomile terpenoids act as a capping and reducing agent being adsorbed on the surface of AgNPs/CE enabling their reduction from Ag(+) and preventing them from agglomeration. Fourier transform infrared and ultraviolet-visible spectroscopy measurements confirmed these findings, as the spectra of AgNPs/CE, compared to pure CE, did not contain the 1109 cm(-1) band, corresponding to -C-O groups of terpenoids and the peaks at 280 and 320 nm, respectively. Antibacterial tests using four bacteria strains showed that the AgNPs/CE performed five times better compared to CE AgNPs/G samples, reducing totally all the bacteria in 2 h.
authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, 31342, Kraków, Poland. bpparlin@cyf-kr.edu.pl.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Parlinska-Wojtan
authors.affiliation: Biotechnology Centre for Applied and Fundamental Sciences, Department of Biotechnology, University of Rzeszow, Sokołowska Street 26, 36-100, Kolbuszowa, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Kus-Liskiewicz
authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, 31342, Kraków, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Depciuch
authors.affiliation: Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA.
authors.forename: Omowunmi
authors.initials: O
authors.lastname: Sadik
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000494:pharmacology*; D020843:Chamomile / Q000737:chemistry*; D003102:Colloids; D053768:Metal Nanoparticles / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D010084:Oxidation-Reduction; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013729:Terpenes / Q000737:chemistry*; D014867:Water
chemical_list: D000900:Anti-Bacterial Agents; D003102:Colloids; D013729:Terpenes; D014867:Water; D012834:Silver
keywords: Antibacterial properties; Camomile; Green synthesis; Silver nanoparticles