Preparation and characterization of silver mesoporous silica nanoshells with promising antibacterial activity
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Preparation and characterization of silver mesoporous silica nanoshells with promising antibacterial activity Noha Mohamed1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Silver nanoparticles are highly efficient antibacterial agents. The applications of silver nanoparticles in the biological environment are always obstructed by oxidation that causes aggregation of nanoparticles which lowers its antibacterial activity. In this research, silver nanoparticles were coated on the surface of mesoporous silica forming mesoporous silver nanoshells (Ag@ MSNs). The prepared nanoparticles were characterized by their zeta potential, particle size, UV absorption spectroscopy, and transmission electron microscopy. Additionally, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) were also performed. The antimicrobial activity of the prepared Ag@MSNs was evaluated against gram-positive and gram-negative pathogens. The results showed that Ag@MSNs are monodispersed with an average size distribution 272 ± 61 nm. Ag@MSNs are highly stable with zeta potential value of 43.3 ± 6.5 mV and an absorption peak at 235 nm. Small-angle X-ray diffraction demonstrated a narrow and strong peak at 2ϴ = 1.71ο indicating that the Ag@MSNs have an ordered porous structure. Surface coating of mesoporous silica nanoparticles with silver shells increased the contact surface area with the bacterial membrane. Thus, Ag@MSNs significantly inhibited the growth of Staphylococcus aureus and E-coli. In conclusion the present study gives new insights into the synthesis of antimicrobial nano-formulation that can offer a variety of uses in industry and biomedical applications. Keywords Mesoporous-silica · Silver nanoparticles · Amino-functionalized · Antimicrobial activity
1 Introduction Microbial infection was considered as a severe public health issue [1]. Side effects and multidrug resistance caused by conventional antibiotics promote researchers to produce new antimicrobial formulations [2, 3]. Silver nanoparticles are very promising antimicrobial agent against several bacteria, viruses, and fungi [4–7]. Nowadays, silver nanoparticles (AgNPs) are commonly incorporated, as antimicrobial agent, in many products, such as plasters, catheters, clothes, toothbrushes, bandages, cosmetics, scalpels, refrigerators, mobile phones and needles [8–13]. The mechanism of interaction of AgNPs with microorganisms starts with the release of silver g+ electrostatically interact with ions (Ag+). The released A the negatively charged cell walls of the microbes leading to membrane permeability disruption and deactivation of * Noha Mohamed [email protected] 1
Biophysics Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
cellular enzymes leading to cell death [14]. Several studies reported that silver nanoparticles induce oxidative stress in mammalian cells [15]. Recent studies focused on the enhancement of silver nanoparticles antimicrobial activity by de
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