Biological synthesis of gold nanoparticles by Bacillus subtilis and evaluation of increased antimicrobial activity against clinical isolates

Thirumurugan, A.; Ramachandran, Somasundaram; Tomy, Neethu Anns; Jiflin, G. J.; Rajagomathi, G.

doi:10.1007/s11814-012-0055-7

Cited by 36 publications

(19 citation statements)

References 23 publications

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“…EDS micrograph (Figure 3(B)) showed that pure AuNPs were obtained after the bio-reduction of gold chloride salt. This result conforms to the observations reported in the work of Thirumurugan et al (36). TEM image of AuNPs was observed to ascertain the morphology and size of the synthesized material (Figure 3(C)).…”

Section: Characterizationsupporting

confidence: 92%

Synthesis, characterization, antimalarial, antitrypanocidal and antimicrobial properties of gold nanoparticle

Larayetan

Ojemaye

Okoh

et al. 2019

Green Chemistry Letters and Reviews

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In this study, we report on the biosynthesis of gold nanoparticles (AuNPs) by using Callistemon citrinus (C. citrinus) seed extract as both reducing and capping agent as well as its characterization. Likewise, the in vitro antiparasitic activities of both biosynthesized gold nanoparticles and crude seed extract of the plant were evaluated. The formation of biosynthesized AuNPs was confirmed by a color change immediately when the seed extract was added to the gold chloride (III) solution. Characterization of the AuNPs was done using analytical tools like ultraviolet-visible spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM) and Fourier transformed infra-red (FTIR). FTIR showed an absorption peak at 230 nm consistent with the absorption band for gold nanoparticles, the morphology and composition of AuNPs was ascertained by SEM and EDX micrographs; uneven spherical-shaped nanoparticles was established by SEM analysis, and an average particle size of about 37 nm was confirmed by the TEM analysis. The crude seed extracts exhibited antitrypanosoma activities with an IC50 of 11.06 µg/mL. Both the crude seed extract and AuNPs were inactive against plasmodial parasite, while the antibacterial assay showed that AuNPs is potent against gram positive and gram negative bacterial strains.

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Section: Characterizationsupporting

confidence: 92%

Synthesis, characterization, antimalarial, antitrypanocidal and antimicrobial properties of gold nanoparticle

Larayetan

Ojemaye

Okoh

et al. 2019

Green Chemistry Letters and Reviews

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“…22 This strong broad Plasmon peak has been well documented for various Me-NPs, with sizes ranging all the way from 2 to 100 nm. of silver and gold ions into elements of silver and gold.…”

Section: Uv-vis Sem Edax and Tem Studies Bioreduction Of Aqueous Agmentioning

confidence: 83%

Green Synthesis of Silver and Gold Nanoparticles Using Lonicera Japonica Flower Extract

Nagajyothi¹,

Lee²,

An³

et al. 2012

Bulletin of the Korean Chemical Society

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A simple green method was developed for rapid synthesis of silver and gold nanoparticles (AgNPs and AuNPs) has been reported using Lonicera japonica flower extract as a reducing and a capping agent. AgNPs and AuNPs were carried out at 70 o C. The successful formation of AgNPs and AuNPs have been confirmed by UV-Vis spectro photometer, fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy dispersive X-ray Analysis (EDAX), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). To our knowledge, this is the first report where Lonicera japonica flower was found to be a suitable plant source for the green synthesis of AgNPs and AuNPs.

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“…Gallic acid is used as a reducing and stabilizing agent, the oxidation reaction of phenol groups in gallic acid was responsible for the reduction of silver ions and the produced quinoid compound with a ketoenol-system could be absorbed on the surface of silver nanoparticles accounting for their stabilization [11]. Compared to all the other compounds, the major bioactive compounds are found as salanin, nimbin, azadirone and azadirachtins are responsible for the synthesis of gold nanoparticles [18]. Proteins and aminoacids have a tendency to reduce silver ions to silver nanoparticles [19].…”

Section: Ftir Analysismentioning

confidence: 99%

Rapid biological synthesis of platinum nanoparticles using Ocimum sanctum for water electrolysis applications

Soundarrajan

Sankari

Dhandapani

et al. 2011

Bioprocess Biosyst Eng

145

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The leaf extract of Ocimum sanctum was used as a reducing agent for the synthesis of platinum nanoparticles from an aqueous chloroplatinic acid (H(2)PtCl(6)·6H(2)O). A greater conversion of platinum ions to nanoparticles was achieved by employing a tulsi leaf broth with a reaction temperature of 100 °C. Energy-dispersive absorption X-ray spectroscopy confirmed the platinum particles as major constituent in the reduction process. It is evident from scanning electron microscopy that the reduced platinum particles were found as aggregates with irregular shape. Fourier-transform infrared spectroscopy revealed that the compounds such as ascorbic acid, gallic acid, terpenoids, certain proteins and amino acids act as reducing agents for platinum ions reduction. X-ray diffraction spectroscopy suggested the associated forms of platinum with other molecules and the average particle size of platinum nanoparticle was 23 nm, calculated using Scherer equation. The reduced platinum showed similar hydrogen evolution potential and catalytic activity like pure platinum using linear scan voltammetry. This environmentally friendly method of biological platinum nanoparticles production increases the rates of synthesis faster which can potentially be used in water electrolysis applications.

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Biological synthesis of gold nanoparticles by Bacillus subtilis and evaluation of increased antimicrobial activity against clinical isolates

Cited by 36 publications

References 23 publications

Synthesis, characterization, antimalarial, antitrypanocidal and antimicrobial properties of gold nanoparticle

Synthesis, characterization, antimalarial, antitrypanocidal and antimicrobial properties of gold nanoparticle

Green Synthesis of Silver and Gold Nanoparticles Using Lonicera Japonica Flower Extract

Rapid biological synthesis of platinum nanoparticles using Ocimum sanctum for water electrolysis applications

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