Abstract
Abstract Green fabrication of metal nanoparticles (NPs), using natural reducing and stabilizing agents existed in plants and their derivatives, due to their unique properties, has gained more attention. The present study focuses on the synthesis of gold (Au), silver (Ag) and selenium (Se) NPs using coffee bean extract under hydrothermal conditions (1.5 atm and 121°C, for 15 min). Coffee bean extract obtained in 2 h processing using Clevenger apparatus and Fourier transform-infrared (FT-IR) spectroscopy indicated five highlighted peaks, namely, hydroxyl, amide, aromatic, alkane and ring groups. Dynamic light scattering analysis revealed that among three different NPs formed, fabricated Ag NPs had small particle size (153 nm) and high zeta potential value (16.8 mV). However, synthesized Au NPs had minimum polydispersity index (0.312). Results also indicated that fabricated Au, Se and Ag NPs had low antioxidant activity with values of 9.1, 8.9 and 8.7%, respectively. Morphological and antibacterial activity assessments, demonstrated that synthesized Ag, Au and Se NPs had spherical shape and high bactericidal activity against E. coli and S. aurous. Obtained results indicated that the synthesized NPs, can be utilized in various areas.
Highlights
According to the National Institute of Health of America, nanotechnology is defined as fabrication of organic and inorganic materials, devices and systems using variousGenerally, three types of synthesis methods are involved in forming inorganic NPS, namely, physical, chemical and green techniques
Our present study focuses on (i) the potential application of coffee extract to form three different metal NPs, namely, Ag, Au and Se NPs; (ii) the assessment of physicochemical attributes of the formed three NPs and highlight the suitability of the coffee extract in metal ion reduction and (iii) measure the antioxidant and bactericidal properties of the resultant different NPs
As can be observed in this figure, five predominated peaks were detected with wavenumbers 3454.16, Table 1: Physicochemical properties of the synthesized three different metal NPs using coffee bean extract
Summary
Three types of synthesis methods are involved in forming inorganic NPS, namely, physical, chemical and green techniques. As compared to the numerous conventional methods of synthesis of NPs which are based on utilizing chemical components as reducing and stabilizing agents, green procedures use natural and biodegradable reducing and capping agents presented in biological systems, including microorganisms, enzymes and plants and their derivatives (Wu and Chen 2010; EskandariNojehdehi et al 2018). Several studies demonstrated that coffee plays protective role against colorectal cancer and Alzheimer’s disease and possesses high antioxidant activity (Carman et al 2014; Vignoli et al 2014). Coffee contains important minerals such as calcium, This work is licensed under the Creative
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