6 research outputs found
Synthesis and Characterization of Silver and Gold Nanoparticles Using Aqueous Extract of Seaweed, Turbinaria conoides,
Silver and gold nanoparticles were synthesized using an aqueous extract of the seaweed Turbinaria conoides and their antibiofilm activity against marine biofilm forming bacteria is reported here. The UV-Vis spectra showed the characteristics SPR absorption band for Ag NPs at 421 and for Au NPs at 538 nm. Further, the synthesized nanoparticles were characterized using FT-IR, XRD, FESEM, EDX, and HRTEM analysis. Spherical and triangular nanostructures of the Ag and Au nanoparticles were observed between the size ranges of 2–17 nm and 2–19 nm, respectively. The synthesized Ag NPs are efficient in controlling the bacterial biofilm formation; however, Au NPs did not show any remarkable antibiofilm activity. The maximum zone of inhibition was recorded against E. coli (17.6±0.42 mm), followed by Salmonella sp., S. liquefaciens, and A. hydrophila. The macrotube dilution method inferred the MIC (20–40 µL mL−1) and MBC (40–60 µL mL−1) of Ag NPs. The CLSM images clearly showed the weak adherence and disintegrating biofilm formation of marine biofilm bacterial strains treated with Ag NPs. The Artemia cytotoxicity assay recorded the LC50 value of 88.914±5.04 µL mL−1. Thus the present study proved the efficiency of Ag NPs as a potent antimicrofouling agent and became the future perspective for the possible usage in the biofouling related issues in the aquaculture installations and other marine systems
Biofabrication and characterization of silver nanoparticles using aqueous extract of seaweed Enteromorpha compressa and its biomedical properties
Green synthesis of nanoparticles using seaweeds are fascinating high research attention nowadays and also gaining center of attention in biomedical applications. In this work, we have synthesized biocompatible and functionalized silver nanoparticles using an aqueous extract of seaweed Enteromorpha compressa as a reducing as well as stabilizing agent and their efficient antimicrobial and anticancer activity are reported here. The UV–vis spectra of AgNPs showed the characteristics SPR absorption band at 421 nm. The chemical interaction and crystalline nature of the AgNPs were evaluated by FT-IR and XRD studies. The XRD result of AgNPs shows typical Ag reflection peaks at 38.1°, 44.2°, 64.4° and 77.1° corresponding to (111), (200), (220) and (311) Bragg’s planes. The surface morphology and composition of the samples were observed by HRTEM, EDS and SAED pattern analyses. Spherical shaped Ag nano structures were observed in the size ranges between 4 and 24 nm with clear lattice fringes in the HRTEM image. This report reveals that seaweed mediated synthesis of AgNPs and sustained delivery of Ag ions to the bacterial and fungal surface have been reducing their growth rate which was evaluated by well diffusion assay. The synthesized AgNPs showed favorable cytotoxicity against Ehlrich Ascites Carcinoma (EAC) cells with IC50 value was recorded at 95.35 μg mL−1. This study showed cost effective silver nanoparticles synthesis with excellent biocompatibility and thus could potentially be utilized in biomedical and pharmaceutical applications
Pt Nanoparticles Supported on Mesoporous CeO<sub>2</sub> Nanostructures Obtained through Green Approach for Efficient Catalytic Performance toward Ethanol Electro-oxidation
In
this report, an easy and green approach to the synthesis of
mesoporous cerium oxide (CeO<sub>2</sub>) nanostructures and followed
by supporting platinum nanoparticles (NPs) on CeO<sub>2</sub> nanostructures
(Pt/CeO<sub>2</sub>) and their application as versatile electrocatalysts
for ethanol electrooxidation has been established. The synthesis of
mesoporous Pt/CeO<sub>2</sub> nanostructures involves two steps. First,
mesoporous CeO<sub>2</sub> nanostructures were synthesized via macroalgae
polymer mediated approach and followed by supporting of PtNPs of ca.
5–10 nm over the mesoporous CeO<sub>2</sub> nanostructures
using seed-mediated chemical reduction process. The structural and
spectroscopic characterization techniques such as transmission electron
microscopy (TEM), X-ray diffraction (XRD), Raman, X-ray photoelectron
spectroscopy (XPS), and small-angle X-ray scattering (SAXS) studies
confirm the strong coupling between PtNPs and the mesoporous CeO<sub>2</sub> support resulting in the generation of more oxygen vacancies,
which can facilitate the enhanced charge transport at their functional
interface. Significantly, the synthesized mesoporous Pt/CeO<sub>2</sub> nanostructures were found to show enhanced electrocatalytic activity
for ethanol electrooxidation reaction. The enhanced performance is
attributed to the synergistic effect of both mesoporous structure
and the formation of more oxygen vacancies in the resultant Pt/CeO<sub>2</sub> nanostructures. Our facile and eco-friendly approach to the
synthesis of mesoporous CeO<sub>2</sub> nanostructures that supports
PtNPs with an excellent catalytic activity is validated as a promising
strategy for potential applications in fuel cells