title: Catalytically and biologically active silver nanoparticles synthesized using essential oil.
abstract: There are numerous reports on phytosynthesis of silver nanoparticles and various phytochemicals are involved in the reduction and stabilization. Pure explicit phytosynthetic protocol for catalytically and biologically active silver nanoparticles is of importance as it is an environmentally benign green method. This paper reports the use of essential oil of Myristica fragrans enriched in terpenes and phenyl propenes in the reduction and stabilization. FTIR spectra of the essential oil and the synthesized biogenic silver nanoparticles are in accordance with the GC-MS spectral analysis reports. Nanosilver is initially characterized by an intense SPR band around 420 nm, followed by XRD and TEM analysis revealing the formation of 12-26 nm sized, highly pure, crystalline silver nanoparticles. Excellent catalytic and bioactive potential of the silver nanoparticles is due to the surface modification. The chemocatalytic potential of nanosilver is exhibited by the rapid reduction of the organic pollutant, para nitro phenol and by the degradation of the thiazine dye, methylene blue. Significant antibacterial activity of the silver colloid against Gram positive, Staphylococcus aureus (inhibition zone--12 mm) and Gram negative, Escherichia coli (inhibition zone--14 mm) is demonstrated by Agar-well diffusion method. Strong antioxidant activity of the biogenic silver nanoparticles is depicted through NO scavenging, hydrogen peroxide scavenging, reducing power, DPPH and total antioxidant activity assays.
authors: Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India; Department of Chemistry, Mar Ivanios College, Thiruvananthapuram 695015, India.
authors: Vidya
authors: V
authors: Vilas
authors: Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India. Electronic address: daizyp@rediffmail.com.
authors: Daizy
authors: D
authors: Philip
authors: Department of Chemistry, Mar Ivanios College, Thiruvananthapuram 695015, India.
authors: Joseph
authors: J
authors: Mathew
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000975:Antioxidants / Q000494:pharmacology; D002384:Catalysis / Q000187:drug effects; D016166:Free Radical Scavengers / Q000494:pharmacology; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008826:Microbial Sensitivity Tests; D009822:Oils, Volatile / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000494:pharmacology*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013211:Staphylococcus aureus / Q000187:drug effects; D014961:X-Ray Diffraction
chemical_list: D000900:Anti-Bacterial Agents; D000975:Antioxidants; D016166:Free Radical Scavengers; D009822:Oils, Volatile; D012834:Silver
keywords: Antibacterial activity; Antioxidant activity; Catalysis; Myristica fragrans; Silver nanoparticles