title: Effect of poly-α, γ, L-glutamic acid as a capping agent on morphology and oxidative stress-dependent toxicity of silver nanoparticles.
abstract: Highly stable dispersions of nanosized silver particles were synthesized using a straightforward, cost-effective, and ecofriendly method. Nontoxic glucose was utilized as a reducing agent and poly-α, γ, L-glutamic acid (PGA), a naturally occurring anionic polymer, was used as a capping agent to protect the silver nanoparticles from agglomeration and render them biocompatible. Use of ammonia during synthesis was avoided. Our study clearly demonstrates how the concentration of the capping agent plays a major role in determining the dimensions, morphology, and stability, as well as toxicity of a silver colloidal solution. Hence, proper optimization is necessary to develop silver colloids of narrow size distribution. The samples were characterized by Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and zeta potential measurement. MTT assay results indicated good biocompatibility of the PGA-capped silver nanoparticles. Formation of intracellular reactive oxygen species was measured spectrophotometrically using 2,7-dichlorofluorescein diacetate as a fluorescent probe, and it was shown that the PGA-capped silver nanoparticles did not induce intracellular formation of reactive oxygen species.
authors: Institute of Technical Sciences of Serbian Academy of Sciences and Arts, Belgrade, Serbia. magdalena.stevanovic@itn.sanu.ac.rs
authors: Magdalena
authors: M
authors: Stevanović
authors: Branimir
authors: B
authors: Kovačević
authors: Jana
authors: J
authors: Petković
authors: Metka
authors: M
authors: Filipič
authors: Dragan
authors: D
authors: Uskoković
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry* / Q000633:toxicity; D002470:Cell Survival / Q000187:drug effects; D056945:Hep G2 Cells; D006801:Humans; D007700:Kinetics; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000633:toxicity; D008854:Microscopy, Electron; D018384:Oxidative Stress / Q000187:drug effects; D010316:Particle Size; D011099:Polyglutamic Acid / Q000737:chemistry* / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D012834:Silver / Q000737:chemistry* / Q000633:toxicity; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001672:Biocompatible Materials; D017382:Reactive Oxygen Species; D011099:Polyglutamic Acid; D012834:Silver