title: Extracellular synthesis of mycogenic silver nanoparticles by Cylindrocladium floridanum and its homogeneous catalytic degradation of 4-nitrophenol.
abstract: Green synthesis of extracellular mycogenic silver nanoparticles using the fungus, Cylindrocladium floridanum is reported. The synthesized mycogenic silver nanoparticles were characterized using UV-Vis absorption spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM) techniques. The nanoparticles exhibit fcc structure with Bragg's reflections of (111), (200), (220) and (311) was evidenced by XRD pattern, high-resolution TEM lattice fringes and circular rings in selected-area electron diffraction (SAED) pattern. The morphology of nanoparticles was roughly spherical in shape with an average size of ca. 25 nm. From FTIR spectrum, it was found that the biomolecules with amide I and II band were involved in the stabilization of nanoparticles. These mycogenic silver nanoparticles exhibited the homogeneous catalytic potential in the reduction of pollutant, 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using sodium borohydride, which followed a pseudo-first-order kinetic model. Thus, the synthesis of metal nanoparticles using sustainable microbial approach opens up possibilities in the usage of mycogenic metal nanoparticles as catalysts in various chemical reactions.
authors: Department of Biotechnology, School of Life Sciences, Pondicherry University, Kalapet, Puducherry 605 014, India; School of Biotechnology, Graduate School of Biochemistry, and Research Institute of Protein Sensor, Yeungnam University, Gyeongsan 712 749, South Korea.
authors: Kannan Badri
authors: KB
authors: Narayanan
authors: Hyun Ho
authors: HH
authors: Park
authors: Natarajan
authors: N
authors: Sakthivel
mesh_terms: D000627:Aminophenols / Q000737:chemistry / Q000302:isolation & purification*; D001203:Ascomycota / Q000378:metabolism*; D002384:Catalysis; D004785:Environmental Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D055772:Green Chemistry Technology; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009596:Nitrophenols / Q000737:chemistry / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000627:Aminophenols; D004785:Environmental Pollutants; D009596:Nitrophenols; D012834:Silver; C026729:4-aminophenol; C024836:4-nitrophenol
keywords: 4-Nitrophenol; Cylindrocladium floridanum; Electron microscopy; Homogeneous catalysis; Mycogenic; Silver nanoparticles