scholarly journals One-Step Synthesis of Anisotropic Gold Nanoparticles with the Aid Extract from Wuluh Starfruit (Averrhoa Bilimbi) Fruit as Reducing and Morphology Controlling Agent

2019 ◽  
Vol 35 (4) ◽  
pp. 1453-1462
Author(s):  
Foliatini ◽  
Nurdiani

The synthesis of anisotropic gold nanoparticles have been successfully conducted using one-step experimental procedures, with the aid of extract from wuluh starfruit (Averrhoa bilimbi) as reducing agent. The synthesis was carried out in the microwave oven at certain power of irradiation. The as-formed nanoparticles were characterized by UV-Vis spectrophotometry and transmission electron microscopy (TEM). The phytochemical assay and ascorbic acid determination was done to support the prediction about the contribution of those compounds in the synthesis. The antimicrobial activity was assayed toward some bacteria. The results confirmed that the amount of phytochemicals and ascorbic acid in the extracts may contribute largely to the effectivity of the synthesis. The morphology of these nanoparticles was greatly affected by both the Au precursor concentration and volume ratio of precursor : extract. The as-formed nanoparticles have medium antibacterial activity, toward Escherichia coli and Bacillus, in which the magnitude of antibacterial activity depends on the ratio of precursor : extract.

2013 ◽  
Vol 88 ◽  
pp. 839-846 ◽  
Author(s):  
Adriana Vulcu ◽  
Camelia Grosan ◽  
Liana Maria Muresan ◽  
Stela Pruneanu ◽  
Liliana Olenic

2000 ◽  
Vol 368 (5) ◽  
pp. 466-470 ◽  
Author(s):  
E. Turkusic ◽  
V. Milicevic ◽  
H. Tahmiscija ◽  
M. Vehabovic ◽  
S. Basic ◽  
...  

Author(s):  
Is Fatimah ◽  
Putwi Widya Citradewi ◽  
Amri Yahya ◽  
Bambang Nugroho ◽  
Habibi Hidayat ◽  
...  

Abstract The composite of green synthesized gold nanoparticles (Au NPs)-doped hydroxyapatite (HA) has been prepared. The gold nanoparticles were produced via bioreduction of HAuCl4 with Clitoria ternatea flower extract, and utilized in the synthesis of hydroxyapatite using Ca(OH)2 and ammonium diphosphate as precursor. The aim of this research is to study the structural analysis of the composite and antibacterial activity test toward Eschericia coli, Staphylococcus aureus, Klebsiela pneumoniae, and Streptococcus pyogenes. In addition, the antioxidant activity was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging method. The monitoring of gold nanoparticles formation was conducted by UV–vis spectroscopy and particle size analyses, meanwhile the synthesized composite was studied using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that homogeneously dispersed gold nanoparticles in HA structure was obtained with the particle size ranging at 5-80 nm. The nanocomposite demonstrated antibacterial activity against tested bacteria. The nanocomposite expressed an antioxidant activity as shown by the DPPH scavenging activity of 66 and 58% at the concentration of 100 μg/mL and 50 μg/mL, respectively.


2007 ◽  
Vol 121-123 ◽  
pp. 251-254 ◽  
Author(s):  
Zhi Rui Guo ◽  
Y. DuanMu ◽  
Ning Gu

Nanoscaled fibrous aggregates of gold nanoparticles have been synthesized by a simultaneous reduction-oxidation polymerization process using aniline as reducing agent as well as monomer in an ethanol medium. Time-dependent UV-Vis absorption spectroscopy was used to track the formation process of gold nanoparticles. The transmission electron microscopy (TEM) images and Fourier transform infrared (FT-IR) spectrum of the as-preapred products indicate these gold nanoparticles were binded by the oxidation polymerization resultant of aniline.


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