Biosynthesis of Iron and Silver Nanoparticles at Room Temperature Using Aqueous Sorghum Bran Extracts

Njagi, Eric C.; Huang, Hui; Stafford, Lisa; Genuino, Homer C.; Galindo, H.; Collins, John B.; Hoag, George E.; Suib, Steven L.

doi:10.1021/la103190n

Cited by 572 publications

(260 citation statements)

References 60 publications

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“…4). In this test no peaks were observed, especially the characteristic peak of zero-valent iron (α-Fe) at 2θ = 44.9°, indicating that the green method produces amorphous nZVI, which was also observed in other studies (Njagi et al, 2011;Shahwan et al, 2011).…”

Section: Xrd Analysissupporting

confidence: 83%

Characterization of green zero-valent iron nanoparticles produced with tree leaf extracts

Machado

Pacheco

Nouws

et al. 2015

Science of The Total Environment

182

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a b s t r a c t Keywords:Zero-valent iron nanoparticles Green synthesis method Tree leaves Size Reactivity AgglomerationIn the last decades nanotechnology has become increasingly important because it offers indisputable advantages to almost every area of expertise, including environmental remediation. In this area the synthesis of highly reactive nanomaterials (e.g. zero-valent iron nanoparticles, nZVI) is gaining the attention of the scientific community, service providers and other stakeholders. The synthesis of nZVI by the recently developed green bottom-up method is extremely promising. However, the lack of information about the characteristics of the synthetized particles hinders a wider and more extensive application. This work aims to evaluate the characteristics of nZVI synthesized through the green method using leaves from different trees. Considering the requirements of a product for environmental remediation the following characteristics were studied: size, shape, reactivity and agglomeration tendency. The mulberry and pomegranate leaf extracts produced the smallest nZVIs (5-10 nm), the peach, pear and vine leaf extracts produced the most reactive nZVIs while the ones produced with passion fruit, medlar and cherry extracts did not settle at high nZVI concentrations (931 and 266 ppm). Considering all tests, the nZVIs obtained from medlar and vine leaf extracts are the ones that could present better performances in the environmental remediation. The information gathered in this paper will be useful to choose the most appropriate leaf extracts and operational conditions for the application of the green nZVIs in environmental remediation.

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Section: Xrd Analysissupporting

confidence: 83%

Characterization of green zero-valent iron nanoparticles produced with tree leaf extracts

Machado

Pacheco

Nouws

et al. 2015

Science of The Total Environment

182

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“…This band grew and blue changed from 435 to 495 nm with increasing time. This band is related to absorption by AgNPs in the visible area (380-450 nm) due to the occurrence of exterior plasmon sensations (24). The raise of the peaks strength show that the absorption of AgNPs was promoted (16).…”

Section: Discussionmentioning

confidence: 96%

Evaluation of Green Synthesis of Ag Nanoparticles Using Eruca sativa and Spinacia oleracea Leaf Extracts and Their Antimicrobial Activity

Alaraidh¹,

Ibrahim²,

El-Gaaly³

2014

Iran J Biotech

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Background: Nano-biotechnology is considered as one of the main vigorous fields of research in new material science. Recently, biosynthetic methods employing both biological microorganisms such as bacteria and fungus or plant extracts have developed rapidly as a trouble-free and feasible choice to obtain nanomaterials alternative to more complex chemical synthetic procedures. The particular distinctiveness like size, allocation and shape give the nanoparticles different properties from bulk material. Objectives: Eruca sativa and Spinacia oleracea plants were evaluated for their extra cellular potential synthesis of silver nanoparticles and their bactericidal impact on Streptococcus pneumoniae and Pseudomonas aeruginosa. Materials and Methods: Aqueous solutions of AgNO 3 were mixed with plant extracts. Transmission electron microscopy (TEM) was used to characterize the morphology of the nanoparticles obtained from plant extracts. Energy dispersive X-ray (EDX) spectrometer established the existence of elemental sign of the silver and homogenous allocation of silver nanoparticles. Diffraction by using X ray (XRD) analysis for the formed AgNPs revealed spherical plus cubical structures with different planes ranging between 111 to 311 planes. Scanning electron microscopy (SEM) was used to characterize the morphology of the nanoparticles obtained from plant extracts. Results: The antibacterial action of AgNPs against human pathogens, Streptococcus pneumoniae and Pseudomonas aeruginosa was recognized. Our work showed a rapid, eco-safe and suitable method for the synthesis of AgNPs from Eruca sativa and Spinacia oleracea leaf extracts and can be used for pharmaceutical and other biomedical applications. Conclusions: It can be suggested that AgNPs show effective antibacterial properties owing to their exceptionally big exterior region, which provides superior contact with microorganisms and its interactions with bacteria are and localized on the membrane of the organism.

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“…This shift may be due to blue shift and depends on the particle size and shape (Kelly et al 2003;Lee and El-sayed 2006). According to Njagi et al (2011), this band corresponds to the absorption by colloidal silver nanoparticles in the region (400-450 nm) due to the excitation of surface plasmon vibration. So the high-concentration sample is used for further analysis.…”

Section: Antibacterial Activitymentioning

confidence: 99%

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

2015

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In this paper, an aqueous extract of fresh leaves of Pedalium murex was used for the synthesis of silver (Ag) nanoparticles. Different biological methods are gaining recognition for the production of silver nanoparticles (AgNPs) due to their multiple applications. The use of plants in the green synthesis of nanoparticles emerges as a cost-effective and eco-friendly approach. Characterization of nanoparticles was done using different methods, which include; ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared (FTIR), powder X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray analysis (EDAX), fluorescence emission spectroscopy, transmission electron microscope (TEM), dynamic light scattering (DLS), zeta potential and antibacterial activity. UV-visible spectrum of the aqueous medium containing silver nanoparticles showed absorption peak at around 430 nm. Fourier transform infrared spectra had shown that the biomolecule compounds were responsible for the reduction and capping material of silver nanoparticles. XRD study showed the particles to be crystalline in nature, with a face-centered cubic (fcc) structure. The size and stability were detected using DLS and zeta potential analysis. The antibacterial activity of AgNPs against generally found bacteria was assessed to find their potential use in silver-containing antibacterial product.

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Biosynthesis of Iron and Silver Nanoparticles at Room Temperature Using Aqueous Sorghum Bran Extracts

Cited by 572 publications

References 60 publications

Characterization of green zero-valent iron nanoparticles produced with tree leaf extracts

Characterization of green zero-valent iron nanoparticles produced with tree leaf extracts

Evaluation of Green Synthesis of Ag Nanoparticles Using Eruca sativa and Spinacia oleracea Leaf Extracts and Their Antimicrobial Activity

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

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