Blue green alga mediated synthesis of gold nanoparticles and its antibacterial efficacy against Gram positive organisms

Suganya, K.; Govindaraju, K.; Kumar, V. Ganesh; Dhas, T. Stalin; Karthick, V.; Ganesan, Singaravelu; Elanchezhiyan, M

doi:10.1016/j.msec.2014.11.043

Cited by 218 publications

(70 citation statements)

References 34 publications

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“…The 50% inhibitory concentration of the Au NPs solutions to inhibit Escherichia coli and Staphylococcus aureus were about 12 and 58 µg mL −1 , respectively. The possible antibacterial mechanism of Au NPs was that the Au NPs accumulated in the bacterial cell wall, causing the cell perforations . Then, the Au NPs moved to the nucleus degrading the nuclear membrane and hindered the DNA replication leading to cell lysis .…”

Section: Resultsmentioning

confidence: 99%

Green biosynthesis of gold nanoparticles using Chenopodium formosanum shell extract and analysis of the particles' antibacterial properties

et al. 2019

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BACKGROUND Various physical and chemical methods for synthesis of metal nanoparticles have had some drawbacks. Therefore, green synthesis of gold nanoparticles (Au NPs) has became one of the most crucial emerging areas of nanobiotechnology. In the present study, plant‐mediated synthesis of Au NPs was performed using Djulis (Chenopodium formosanum) shell extract as a reducing and stabilizing agent. RESULTS Reaction parameters were manipulated to optimize the Au NPs using a UV‐visible spectrophotometer. Optimized Au NPs with a surface plasmon resonance band at 533 nm were prepared using a 744 µg mL−1 extract and a solution of pH 2.62 chloroauric acid (HAuCl4·3H2O) at 40 °C. High‐resolution transmission electron microscopy (HR‐TEM) results indicated that most of the resultant Au NPs were spherical in shape and exhibited a mean size of 8 ± 6 nm. Energy‐dispersive X‐ray spectroscopy (EDS), and selected area electron diffraction (SAED), and X‐ray diffraction (XRD) confirmed the elemental gold and crystalline nature of the resultant NPs. FTIR spectrum analysis indicated the critical role of phenolic groups in the reduction of Au3+ ions and stabilization of the formed Au NPs. Moreover, the synthesized Au NPs possessed antibacterial activity for Escherichia coli and Staphylococcus aureus. CONCLUSION In this study, Au NPs were synthesized with high efficiency and stability using Djulis shell extract, and related antibacterial applications were demonstrated. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Green biosynthesis of gold nanoparticles using Chenopodium formosanum shell extract and analysis of the particles' antibacterial properties

et al. 2019

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“…Esta menor proporción permite observar los espaciamientos y lími-tes entre las colonias de bacterias. A pesar de que se pueden observar colonias bacterianas individuales, su tamaño, aglomeración y la presencia de bacterias con un desplazamiento estilo swimming (Hernández y Rodríguez, 1999;Uma et al, 2015), hace imposible su identificación cualitativa. A su vez, el crecimiento de un hongo filamentoso en la muestra de T. indica, D coloración blanca, hace imposible la verificación de cuantas colonias se encuentren a su alrededor.…”

Section: Resultados Y Discusiónunclassified

Evaluación de la propiedad antimicrobial de las nanopartículas de oro sintetizadas con extractos de tamarindus indica L y mangifera indica L

Naranjo-Herrera¹,

Correa-Torres²,

Herrera-Barros³

2017

IIT

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“…Then after few days the phycocyanobilins started gradually decaying and the SPR at 520 nm was recorded. The second, the Suganya and co-authors indicate that excitation maximum at 620 nm may be due to HOMO-LUMO intraband transitions of the nanoparticles [44]. At next days the size of nanoparticles probably was changed (they grew up) what caused the shift of SPF from 620 nm to 520 nm.…”

Section: Discussionmentioning

confidence: 95%

“…The study of Dahoumane and coauthors proved that other types of microalgae, devoid of nitrogenases, offer a better yield of nanoparticles [24,29,31,32]. Spirulina platensis is the most frequently mentioned cyanobacterial species able to produce AuNPs [33,34] and thus can be regarded as a model microorganism in this group. Other species described in the literature include Nostoc ellipsosporum [35], Phormidium valderianum, Phormidium tenue [36], Anabaena flos-aquae [29] and Anabaena sp.…”

Section: Introductionmentioning

confidence: 99%

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

et al. 2017

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Anew aspect of this study is the biocatalysis ability of Anabaena laxafresh-water strain-which to date has not been studied with respect to the formation of gold nanoparticles. The results of our study have shown that A. laxa is able to form gold nanoparticles (AuNPs) at good yields within 24 h of incubation at all three tested concentrations (0.1, 0.5 and 1 mM) of hydrogen tetrachloroaurate (III). After 24 h, nanoparticles were mostly localized in the growth medium, which significantly facilitates their isolation. However, the elongation of this process is accompanied by their concentration in the exopolysaccharide (EPS) layer of the cyanobacterial cells. There is a correlation between the initial concentration of the Au 3? cations and the formation of AuNPs of various shapes and a size. The comparison of activities of living and deactivated cells indicated that AuNPs were formed more efficiently when metabolically active cyanobacteria were used.

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Blue green alga mediated synthesis of gold nanoparticles and its antibacterial efficacy against Gram positive organisms

Cited by 218 publications

References 34 publications

Green biosynthesis of gold nanoparticles using Chenopodium formosanum shell extract and analysis of the particles' antibacterial properties

Green biosynthesis of gold nanoparticles using Chenopodium formosanum shell extract and analysis of the particles' antibacterial properties

Evaluación de la propiedad antimicrobial de las nanopartículas de oro sintetizadas con extractos de tamarindus indica L y mangifera indica L

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

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