Biosynthesis of silver and gold nanoparticles by novel sundriedCinnamomum camphoraleaf

Abstract

The synthesis of nanocrystals is in the limelight in modern nanotechnology. Biosynthesis of nanoparticles by plant extracts is currently under exploitation. Not only could silver nanoparticles ranging from 55 to 80 nm in size be fabricated, but also triangular or spherical shaped gold nanoparticles could be easily modulated by reacting the novel sundried biomass of Cinnamomum camphora leaf with aqueous silver or gold precursors at ambient temperature. The marked difference of shape control between gold and silver nanoparticles was attributed to the comparative advantage of protective biomolecules and reductive biomolecules. The polyol components and the water-soluble heterocyclic components were mainly responsible for the reduction of silver ions or chloroaurate ions and the stabilization of the nanoparticles, respectively. The sundried leaf in this work was very suitable for simple synthesis of nanoparticles.

Catharanthus roseus: a natural source for the synthesis of silver nanoparticles

“…A comparison of our XRD spectrum with the standard confirmed that the silver particles formed in our experiments were in the form of nanocrystals, as evidenced by the peaks at 2 毴 values of 26.2 曘 , 27.9 曘 , and 32.3 曘 , corresponding to (125), (226), and (264), respectively, for silver. The X-ray diffraction results clearly show that the silver nanoparticles formed by the reduction of Ag + ions by the C. roseus leaf extract are crystalline in nature [26] . As mentioned in the method section, the silver nanoparticles once formed were repeatedly centrifuged and redispersed in sterile distilled water prior to XRD analysis, thus ruling out the presence of any free compound/protein that might independently crystallize and giving rise to Bragg reflections.…”

“…Its applications include jewels, utensils, currency, dental alloy, photography and explosives. Among silver's many applications, its disinfectant property is being exploited for hygienic and medicinal purposes, such as treatment of mental illness, nicotine addiction and infectious disease like syphilis and gonorrhea [26,27] . Silver nanoparticles have been demonstrated to exhibit antimicrobial properties against bacteria with close attachment of the nanoparticles themselves with the microbial cell and the activity being Theta-2Theta(dag) Figure 5.…”

Green synthesis, antimicrobial and cytotoxic effects of silver nanoparticles using Eucalyptus chapmaniana leaves extract

“…Although biosynthesis of silver nanoparticles by plants such as Desmodium triflorum [17] , Cinnamomum camphora [18] , Moringa oleifera [19] , and Eucalyptus hybrida [20] have been reported, the potential of the plants as biological materials for the synthesis of nanoparticles is currently under exploitation.…”

Extracellular synthesis of silver nanoparticles using dried leaves of pongamia pinnata (L) pierre

“…Mukherjee and co-workers [10] The band around 1069 cm -1 can be assigned to the ether linkages or -C-O- [14,25], whereas, the band around 1314 cm -1 and 1390 cm -1 can be assigned to geminal methyls [14] (see Fig. (5a)).…”

“…(5a)). To a large extent, the band at 1069 cm -1 might be contributed by the -C-O-groups of the polyols such as flavones, terpenoids and the polysaccharides present in the biomass [25]. The absorbance band centered at 1620 and 1653 cm -1 (5a) is associated with the stretching vibration of -C=C-or aromatic groups [14,25].…”