Bacteria-template synthesized silver microspheres with hollow and porous structures as excellent SERS substrate

Yang, Da‐Peng; Chen, Shouhui; Huang, Peng; Wang, Xiansong; Jiang, Weiqiao; Pandoli, Omar; Cui, Daxiang

doi:10.1039/c0gc00431f

Cited by 130 publications

(86 citation statements)

References 45 publications

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“…Application of silver nanoparticles includes clothing [3], food industry [4], agriculture [5], textile industry [6], water treatment [7] and therapeutic agents for diagnosing chronic diseases [8]. Silver is a better substitute compared to the other metals as it has very less or no toxic effect and also they are widely used as bactericide in catheters, burn wounds and dental work [9,10].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles Using Cosmos Sulphureus and Evaluation of Their Antimicrobial and Antioxidant Properties

Malaka¹,

Hema²,

Muthukumarasamy³

et al. 2016

Nano BioMed ENG

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The present study intended to synthesize, characterize silver nanoparticles (AgNPs) using Cosmos sulphureus (Cs) aqueous leaf extract and their antimicrobial and antioxidant activities. The UV-vis spectrophotometer exhibited an absorbance peak around 430-440 nm with color intensity from yellow to reddish brown after 4 days. SEM and EDX analysis showed AgNPs were pure and polydispersed and the size were ranging from 55 to 80 nm. XRD revealed that the nanoparticles were cubic and face centered in shape and the biogenic CsAgNPs showed effective potent antimicrobial and antioxidant activities. This study may serve as a tool for analyzing the controlled release of synthesized AgNPs, which have prospective role in the field of disease management particularly with respect to resistant pathogenic microorganisms.

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Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles Using Cosmos Sulphureus and Evaluation of Their Antimicrobial and Antioxidant Properties

Malaka¹,

Hema²,

Muthukumarasamy³

et al. 2016

Nano BioMed ENG

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show abstract

“…Biomaterials have been considered an attractive resource for green synthesis due to their diversity, regenerative ability, and safety. [1][2][3][4] Among various MNPs, gold nanoparticles (GNPs) have been extensively studied based on their unique optoelectronic and electrochemical properties. The unique properties of GNPs have been potentially of interest for biological applications including sensors, 5,6 catalysts, 7 optical probes, [8][9][10] tumor photothermal therapy, 11 biomedical engineering, 12 and surface-enhanced Raman scattering (SERS).…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of gold nanoparticles using chloroplasts

Zhang¹,

Zheng²,

Guo³

et al. 2011

IJN

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Abstract:In this paper, a new method of one-pot biosynthesizing of gold nanoparticles (GNPs), using chloroplasts as reductants and stabilizers is reported. The as-prepared GNPs were characterized by ultraviolet visible spectroscopy, transmission electron microscopy, X-ray powder diffraction, and Fourier transform infrared spectroscopy (FTIR). The cytotoxicity of the GNPs was evaluated using the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method against gastric mucous cell line GES-1 and gastric cancer cell line MGC-803. Rhodamine 6G as a Raman probe was used for investigating surface-enhanced Raman spectroscopy (SERS) enhancement of GNPs. The transmission electron microscopy results indicated that the GNPs were spherical in structure and almost 20 nm in diameter. Ultraviolet visible spectroscopy exhibited an absorption peak at 545 nm. The GNPs exhibited high crystallinity, with the (111) plane as the predominant orientation, clarified by X-ray powder diffraction. In addition, a potential mechanism was proposed to interpret the formation process of GNPs, mainly based on the analysis of FTIR results. The FTIR spectrum confirmed that the GNPs were carried with N-H groups. Toxicological assays of as-prepared GNPs revealed that the green GNPs were nontoxic. SERS analysis revealed that the GNPs without any treatment could substantially enhance the Raman signals of rhodamine 6G. The Raman enhancement factor was calculated to be nearly 10 10 orders of magnitude. In conclusion, the GNPs with good biocompatibility and excellent SERS effect were successfully synthesized using chloroplasts. These biogenetic GNPs have great potential for ultrasensitive detection of biomarkers in vitro and in vivo based on SERS.

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“…Biotemplated strategies might be alternative to achieve the three standards, [10][11][12][13][14] which are based on biological molecules, microorganism or plant extract for synthesis of NPs, such as Au NPs [15], Ag NPs [16] and other functional materials [17,18]. There are many biologically active components in the extracts of fresh plant, such as proteins, polysaccharides, vitamins, polyphenols and so on.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Antibacterial Effects of Silver Nanoparticles@Aloe Vera Prepared via a Green Method

Zhang¹,

Yang²,

Kong³

et al. 2010

Nano BioMed ENG

Self Cite

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Aloe Vera-conjugated Ag nanoparticles (AgNPs@AV hybrids) are synthesized in large quantities by reducing silver nitrate with Aloe Vera pulp extract at room temperature. TEM image reveals that these NPs are predominantly spherical with an average of 25 nm in diameter. The crystal structure of AgNPs@AV is determined by XRD. The cytotoxicity of AgNPs@AV hybrids is detected by carrying out the cell viability measurement on Human Dermal Fibroblasts (HDF) cells, the results show that no obvious cytotoxicity is observed. Compared with Vera gel and Ag NPs (washed from Vera gel) alone, AgNPs@AV hybrids possess more excellent antibacterial activity on E. coli even at very low concentration.

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Bacteria-template synthesized silver microspheres with hollow and porous structures as excellent SERS substrate

Cited by 130 publications

References 45 publications

Green Synthesis of Silver Nanoparticles Using Cosmos Sulphureus and Evaluation of Their Antimicrobial and Antioxidant Properties

Green Synthesis of Silver Nanoparticles Using Cosmos Sulphureus and Evaluation of Their Antimicrobial and Antioxidant Properties

Biosynthesis of gold nanoparticles using chloroplasts

Synergetic Antibacterial Effects of Silver Nanoparticles@Aloe Vera Prepared via a Green Method

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