Brazilian integrated sugarcane-soybean biorefinery: Trends and opportunities

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Analysis of microplastics and nanoplastics: How green are the methodologies used?

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The circular chemistry conceptual framework: A way forward to sustainability in industry 4.0

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Recent trends in the stereoselective synthesis of (poly)-substituted 2-oxo acids by biocatalyzed aldol reaction

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Complex of lysozyme and Myramistin: formation and adsorption at the water–xylene interface

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Eco-friendly synthesis of size-controlled silver nanoparticles by using Areca catechu nut aqueous extract and investigation of their potent antioxidant and anti-bacterial activities

Silver nanoparticles (AgNPs) have attracted considerable attention owing to their unique biological applications. AgNPs synthesized by plant extract is considered as a convenient, efficient and eco-friendly material. In this work, the aqueous extract of Areca catechu L. nut (ACN) was used as the reducing and capping agents for one-pot synthesis of AgNPs, and their antioxidant and antibacterial activities were investigated. UV (Ultra Violet)-visible spectrum and dynamic light scattering (DLS) analysis revealed that the size of AgNPs was sensitive to the synthesis conditions. The synthesized AgNPs were composed of well-dispersed particles with an small size of about 10 nm under the optimal conditions (pH value of extract was 12.0; AgNO₃ concentration was 1.0 mM; reaction time was 90 min). In addition, scanning electron microscope with energy dispersive X-ray (SEM-EDX), transmission electron microscopy (TEM) and X-ray diffraction (XRD) results further verified that the synthesized AgNPs had a stable and well-dispersed form (Zeta potential value of ?30.50 mV and polydispersity index of 0.328) and a regular spherical shape (average size of 15–20 nm). In addition, Fourier transform infrared spectrometry (FTIR) results revealed that phytochemical constituents in ACN aqueous extract accounted for Ag⁺ ion reduction, capping and stabilization of AgNPs. The possible reductants in the aqueous extract of Areca catechu L. nut were identified by high-performance liquid chromatography-electrospray ionization-quadrupole-time of flight-mass spectrometry (HPLC-ESI-qTOF/MS) method. More importantly, the synthesized AgNPs indicated excellent free radical scavenging activity of 1,1-diphenyl-2-picrylhydrazyl (DPPH, IC₅₀ = 11.75 ± 0.29 μg/mL) and 2,2-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS⁺, IC₅₀ = 44.85 ± 0.37 μg/mL), which were significant higher than that of ascorbic acid. Moreover, AgNPs exhibited an enhanced antibacterial activity against six selected common pathogens (especially Escherichia coli and Staphylococcus aureus) compared with AgNO₃ solution. In a short, this study showed that the Areca catechu L. nut aqueous extract could be applied for eco-friendly synthesis of AgNPs.     

A facile approach to prepare water-soluble magnetic metal (oxide) frameworks based on Na,Ca alginate and maghemite

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Intrinsic infrared absorption for carbon–fluorine bonding in fluorinated nanodiamond

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Different addition modes of cyclopentadiene and furan at methylidene(thio)hydantoins

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Role of benzothiadiazole substituents in white electroluminescent single macromolecules of fluorene-based copolymers

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A LiNi0.8Co0.15Al0.05O2/Ge electrochemical system for lithium-ion batteries

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Synthesis of B-silylmethyl substituted o- and m-carboranes

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Molecular mechanism of the cesium and rubidium selective binding to the calix[4]arene revealed by Born–Oppenheimer molecular dynamics simulation and electron density analysis

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Energy of the surface segregation of Ag atoms in Ag–Au alloys in an aqueous solution

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Thermal,elastic and optical properties of nanostructured Pb1−xAgxS solid solutions

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Synthesis of 3-hetarylpyrroles by Suzuki–Miyaura cross-coupling

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Nickel catalyzed hydrosilane reduction of (het)arenecarboxylic acids into aldehydes

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Electrooxidative C–H thiocyanation of hetarenes: voltammetric assessment of thiocyanogen reactivity

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Formation of 2D calcium hydroxyapatite on stainless steel modified with a TiN sublayer

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