Mycogenic metal nanoparticles: progress and applications

Gade, Aniket; Ingle, Avinash P.; Whiteley, Chris G.; Rai, Mahendra

doi:10.1007/s10529-009-0197-9

Cited by 187 publications

(74 citation statements)

References 45 publications

(32 reference statements)

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“…It was reported that zeta potential value closer to -30 mV indicate that metal nanoparticles are more stable [40,57]. The analyses of all tested metal nanoparticles revealed the negative values of zeta potential.…”

Section: Discussionmentioning

confidence: 84%

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Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

et al. 2016

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Biological systems such as bacteria, fungi or plants for synthesis of noble nanoparticles (NPs) are easy, inexpensive and eco-friendly. Obtained bioparticles due to its physico-chemical nature possess biologically active properties such as antimicrobial activity. In this study, the biological synthesis of silver (Ag) and gold (Au) nanoparticles using Streptomyces sp. strain NH21 isolated from acidic soil and its antibacterial activity against bacteria is presented. The physico-chemical properties of obtained particles were characterized. UV-Vis showed broad peak at 404 and 424 nm for AgNPs and 564 nm for AuNPs. Transmission electron microscopy studies showed small sized nanoparticles of 44 nm for supernatant and 8.4 nm for biomass synthesized AgNPs, and 10 nm for supernatant synthesized AuNPs, which was confirmed by nanoparticle tracking analyses. Fourier transform infrared spectroscopy revealed the presence of capping agents over metal-NPs. The negative Zeta potential values of metal-NPs indicated stability of biosynthesized particles. In vitro antibacterial activity and minimal inhibitory concentration of NPs was assessed against Gram-positive and Gram-negative bacteria. Unlike to gold-NPs, silver-NPs showed reliable antibacterial activity. Atomic force microscopy analysis recorded changes in cell morphology of tested bacterial strains after treatment with nanoparticles.

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Section: Discussionmentioning

confidence: 84%

“…Biogenic synthesis of silver nanoparticles has been well proved by using bacteria, fungi algae and plants [40][41][42]. Although in recent years functionalized gold nanoparticles have attached much attention their application in biomedicine is still in initial stage.…”

Section: Discussionmentioning

confidence: 99%

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

et al. 2016

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“…Segundo Bansal et al [l7], formamse então nanopartículas esféricas de sílica. O período de disponibilização da sílica corresponde à fase exponencial do F. oxysporum, que é o período onde se tem maior quantidade de biomassa e de enzimas excretadas extracelularmente pelo Fusarium oxysporum para a lixiviação seletiva de sílica, assim como a geração de proteínas que estabilizam as partículas [17,23,24]. No processo onde somente se tem o meio de cultura (Figura 3), observam-se variações na concentração de sílica, pois o microrganismo empregado foi obtido de uma placa de Petri com meio de cultura sólido na presença de CCA com a finalidade de diminuir o tempo de adaptação à sílica.…”

Section: Figuraunclassified

“…Os mecanismos podem ser atribuídos à ação enzimática e lixiviação ácida. [14,17,23]. Em conclusão, foi possível observar que o fungo Fusarium oxysporum pode ser usado para biotransformar a sílica amorfa presente na cinza da casca de arroz através da ação microbiana.…”

Section: Análise Da Microestrutura Das Partículas Da Ccaunclassified

Biotransformação da cinza da casca de arroz em nanopartículas de sílica mediante Fusarium oxysporum

et al. 2012

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RESUMONeste estudo avaliou-se uma rota biológica à temperatura ambiente para a biotransformação da cinza da casca de arroz em nanopartículas de sílica empregando o fungo Fusarium oxysporum. Foram realizados ensaios e monitorou-se a produção de biomassa fúngica, pH e concentração de sílica solúvel em meio de cultura contendo cinza durante 270 h a uma temperatura de 25°C, com uma concentração inicial de biomassa de 0,3 g/L (base úmida) in situ. A cinza antes e após o tratamento foi analisada por espectroscopia de infravermelho IV; MEV e DRX. Os resultados deram indícios que com o processo biológico à temperatura ambiente ocorre uma biotransformação da cinza da casca de arroz, gerando sílica solúvel e cristalina no meio de cultura. Tais resultados indicam a possibilidade da síntese por via biológica de nanomateriais óxidos.Palavras-chave: Cinza da casca de arroz, sílica, bioprocessamento, Fusarium oxysporum, nanomateriais. Biotransformation of rice husk ash in silica nanoparticles by Fusarium oxysporum ABSTRACTIn this study a biological route at room temperature for the biotransformation of rice husk ash (RHA) in silica nanoparticles using the fungus Fusarium oxysporum was evaluated. Some tests were carried out by monitoring the fungal biomass production, pH, soluble silica on culture medium with rice husk ash and fungi, during 270 h at a 25°C temperature and 0.3 g/L (wet basis) biomass concentration, in situ. The RHA was analyzed before and after processing by SEM and XRD. The results indicated that trhrough a biological process at room temperature a biotransformation of rice husk ash is reached by bioleaching and enzymatic action allowing the synthesis of oxidic nanomaterials. Keywords: Rice husk ash, silica, bioprocessing, Fusarium oxysporum, nanomaterials INTRODUÇÃOA cinza da casca de arroz (CCA) é um subproduto agrícola empregado como biocombustível em diferentes processos como pirólise, gaseificação e combustão em leitos fixos e fluidificados especialmente em indústrias de beneficiamento de arroz [1][2][3]. A quantidade de sílica presente na CCA pode variar entre 80 e 97% dependendo das condições de queima e sua estrutura encontra-se, principalmente, na forma amorfa [1,4].A sílica é um material inorgânico empregado em uma ampla gama de aplicações comerciais como peneiras moleculares, suporte para catalisadores, materiais eletrônicos, assim como na indústria civil como pozolana no cimento e na produção de abrasivos de carbeto de silício, entre outros [4][5][6][7]. As partículas de sílica apresentam baixa densidade e alta resistência térmica e química. Com a diminuição no tamanho de partícula, a reatividade da sílica aumenta significativamente, facilitando, por exemplo, o processo de sinterização. Atualmente, a síntese de nanoestruturas da sílica é feita em condições extremas de pH, usando produtos como HCl, H 2 SO 4 , HNO 3 , NaOH e NH 4 OH [8], além de pressões e temperaturas elevadas [9], eventual-

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“…However, toxic effects of various chemicals and organic solvents used in physical and chemical methods have promoted an increasing interest in biomass as a biosynthetic machinery for the production of metal nanoparticles [13][14][15][16]. Biosynthesis of gold nanoparticles has been reported using bacteria [17], yeasts [18], actinomycetes [19], fungi [20], and plants [21]. Although biological methods are regarded as safe, cost-effective, sustainable, and clean processes, they also have some drawbacks in culturing microbes and using biomasses, which are time-consuming and difficult in providing better control over size distribution, shape, and crystallinity [22].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Possibilities of Biological Fabrication of Gold Nanostructures Using Orange Peel Extract

Castro¹,

Blázquez²,

González³

et al. 2015

Metals

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Development of nanotechnology requires a constant innovation and improvement in many materials. The exploration of natural resources is a promising eco-friendly alternative for physical and chemical methods. In the present work, colloidal gold nanostructures were prepared using orange peel extract as a stabilizing and reducing agent. The initial pH value of the solution and the concentration of the gold precursor had an effect on the formation and morphology of nanoparticles. The method developed is environmentally friendly and allows control of nanoparticles. By controlling the pH and, especially, the gold concentration, we are able to synthesize crystalline gold nanowires using orange peel extract in the absence of a surfactant or polymer to direct nanoparticle growth, and without external seeding. UV-VIS spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the nanoparticles obtained by biosynthesis.

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Mycogenic metal nanoparticles: progress and applications

Cited by 187 publications

References 45 publications

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

Biotransformação da cinza da casca de arroz em nanopartículas de sílica mediante Fusarium oxysporum

Exploring the Possibilities of Biological Fabrication of Gold Nanostructures Using Orange Peel Extract

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