Hypericum perforatum L.-Mediated Green Synthesis of Silver Nanoparticles Exhibiting Antioxidant and Anticancer Activities

Alahmad, Abdalrahim; Feldhoff, Armin; Bigall, Nadja C.; Rusch, Pascal; Scheper, Thomas; Walter, Johanna‐Gabriela

doi:10.3390/nano11020487

Cited by 79 publications

(41 citation statements)

References 112 publications

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“…The peaks at 38.01°, 44.34°, 65.52°, and 77.30° are equivalent to ( hkl ) planes of (111), (200), (220), and (311) planes, respectively. These peaks can be accredited to the face-centered cubic structure of silver nanocrystals, and they are in outstanding agreement with the previous studies [ 99 , 100 ]. It can be seen from Figure 6 a that the diffraction pattern has been matched with JCPDS card No.…”

Section: Resultssupporting

confidence: 91%

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Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

et al. 2021

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Silver (Ag) nanoparticles (NPs) have been synthesized through an easy, inexpensive, and ecofriendly method. Petroselinum crispum, parsley, leaf extract was utilized as a reducing, capping, and stabilizing agent, without using any hazardous chemical materials, for producing Ag NPs. The biosynthesized Ag NPs were characterized using different characterization techniques, namely UV-Vis, FT-IR spectroscopy, X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), dynamic light scattering (DLS), zeta potential, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), transmission electron microscope (TEM), field emission scanning electron microscopy (FESEM), and energy-dispersive X-ray (EDX) analysis to investigate the optical, thermal, structural, morphological, and chemical properties of the plant extract and the biosynthesized Ag NPs. After that, the biosynthesized Ag NPs were utilized in harvesting sunlight for solar thermal generation. Surface plasmon resonance (SPR) for the green synthesized Ag NPs with the dark color were adjusted at nearly 450 nm. Once the Ag NPs are excited at the SPR, a large amount of heat is released, which causes a change in the local refractive index surrounding the Ag NPs. The released heat from the Ag NPs under the solar irradiation at the precise wavelength of plasmon resonance significantly increased the temperature of the aqueous medium. Different percentages of Ag NPs were dispersed in water and then exposed to the sunlight to monitor the temperature of the suspension. It was found that the temperature of the aqueous medium reached its highest point when 0.3 wt. % of Ag NPs was utilized. This investigation is rare and unique, and it shows that utilizing a small amount of the biosynthesized Ag NPs can increase the temperature of the aqueous medium remarkably.

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Section: Resultssupporting

confidence: 91%

“…Additionally, the Ag NPs are separated from each other by a uniform interparticle distance. The results of HRTEM are in excellent agreement with an earlier investigation by Alahmad et al [99].…”

Section: Transmission Electron Microscopy Analysis Of Ag Npssupporting

confidence: 91%

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

et al. 2021

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“…The selected area diffraction pattern showed that the BkCE-AgNPs were a mixture of monocrystalline and polycrystalline nature. The concentric ring corresponding to the planes (111), ( 200), ( 220) and (300) con rmed the crystalline facecentered cubic lattice AgNPs (Alahmad et al 2021).…”

Section: Xrd Analysismentioning

confidence: 82%

Biofabrication of isotropic silver nanoparticles using cell-free metabolic extract of Bacillus kochii, and evaluation of their antimicrobial, antioxidant and catalytic potentials

Vadivel

Mondal

Raman

et al. 2021

Preprint

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Microbial metabolites have been reported as potent candidates in the biofabrication of nanomaterials. For the first time, the present study reported the biofabrication of ecofriendly isotropic silver nanoparticles (BkCE-AgNPs) showed potential antimicrobial, antioxidant and biocatalysts characteristics using the metabolite of Bacillus kochii. Further, B. kochii crude extract (BkCE) mediated synthesis of BkCE-AgNPs was confirmed by surface plasmon resonance (SPR) peak at 420 nm using a UV-vis spectrophotometer. Various major physico-chemical parameters such as temperature, pH, crude extract concentration, AgNO3 concentration were utilized to characterize BkCE-AgNPs. In addition, FTIR analysis revealed the functional groups of active compounds present in the BkCE that mediated the fabrication of BkCE-AgNPs. Whereas, HRTEM confirmed the synthesis of BkCE-AgNPs with a size range between 4 to 44 nm and the crystalline nature of the biofabricated BkCE-AgNPs was confirmed by EDAX. Furthermore, the BkCE-AgNPs exhibited a broad-spectrum antimicrobial activity against A. baumannii, S. typhi, E. coli, K. pneumoniae, S. aureus and P. aeruginosa. The BkCE-AgNPs also showed excellent catalytic dye degradation potential and antioxidant activities confirmed by DPPH assay, total reducing sugar test and nitric oxide scavenging assays. In conclusion, the present study could help understand the development of biofabrication of nanomaterials using potent microbial metabolites in the agricultural and medicinal industries.

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“…These values corresponded to the (111), ( 200), (220), and (311) lattice planes of the face-centered cubic structure (fcc) of silver according to the JCPDS No. 03-065-2871 (Alahmad et al 2021). The SAED-TEM and XRD analyses suggested that the identities of the synthesized nanomaterials were AgNPs.…”

Section: Synthesis and Characterization Of Agnpsmentioning

confidence: 99%

Does Size Matter? Toxicity Effects of 5‐nm and 70‐nm Silver Nanoparticles on Hoplobatrachus Rugulosus Frog

Siri

Bamroongnok

Kuaprasert

et al. 2021

Preprint

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With the increased usage of silver nanoparticles (AgNPs), the potential impacts of released AgNPs in the environment are increasingly concerned, especially to natural living organisms. Since the properties of AgNPs significantly depend on their sizes, this work aimed to compare the effects of 5-nm and 70‐nm AgNPs on toxicity and bioaccumulation in Hoplobatrachus rugulosus, the edible East Asian Bullfrog. The synthesized AgNPs were characterized by X‐ray diffraction and selected area electron diffraction analyses. Both 5‐nm and 70‐nm AgNPs caused mortality, reduced growth, induced abnormal development, generated cellular oxidative stress, and modulated cellular biomolecule pattern of frog embryos, but at different levels. The 5‐nm AgNPs caused harmful effects on the frog embryos more than 70-nm AgNPs, likely due to their small size to allow more accessibility into the cell. The mortality effects of AgNPs depended on the concentration, exposure time, and size. The malformation of frog embryos in response to AgNPs-exposure included scoliosis, lordosis, kyphosis, and yolk sac edema. Synchrotron Fourier transformed infrared analyses revealed that 5‐nm AgNPs significantly changed the profile of cellular biomolecules in the embryos, indicated by the spectral peaks assigned to lipid, carbohydrates, proteins, and nucleic acids. The bioaccumulation of silvers was dominant in eggs, followed by stomach, liver, kidney, and intestine, respectively, suggesting their translocation via blood circulation. The result of high accumulated silver in eggs and effects on embryonic mortality, growth, development, and cellular changes suggested the potential negative impacts of AgNPs on the sustainability of this frog in the environment.

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Hypericum perforatum L.-Mediated Green Synthesis of Silver Nanoparticles Exhibiting Antioxidant and Anticancer Activities

Cited by 79 publications

References 112 publications

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

Biofabrication of isotropic silver nanoparticles using cell-free metabolic extract of Bacillus kochii, and evaluation of their antimicrobial, antioxidant and catalytic potentials

Does Size Matter? Toxicity Effects of 5‐nm and 70‐nm Silver Nanoparticles on Hoplobatrachus Rugulosus Frog

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