Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 2 de 2
Filter
Add more filters










Database
Language
Publication year range
1.
Curr Microbiol ; 80(5): 181, 2023 Apr 12.
Article in English | MEDLINE | ID: mdl-37046124

ABSTRACT

In this paper, we synthesized graphene quantum dots magnesium hydroxide nanocomposites (GQDs/Mg(OH)2). The synthesized nanocomposites were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Malvern Zetasizer. The antimicrobial and antioxidant properties of the obtained GQDs/Mg(OH)2 nanocomposites were investigated. GQDs/Mg(OH)2 nanocomposites have MIC values of 15.625 µg/mL against fungi (C. metapsilosis and C. parapsilosis) and 62.5 µg/mL against Gram (+) (S. pneumonia and E. faecalis) and Gram (-) (E. coli). The synthesized GQDs/Mg(OH)2 nanocomposites showed moderate antioxidant activity. The results showed that at 100-µg/mL GQDs/Mg(OH)2 nanocomposite concentration, the H2O2 scavenging activity was 62.18%.


Subject(s)
Anti-Infective Agents , Graphite , Nanocomposites , Quantum Dots , Quantum Dots/chemistry , Antioxidants/pharmacology , Graphite/pharmacology , Graphite/chemistry , Magnesium Hydroxide , Hydrogen Peroxide/pharmacology , Escherichia coli , Anti-Infective Agents/pharmacology , Nanocomposites/chemistry
2.
Anal Biochem ; 621: 114123, 2021 05 15.
Article in English | MEDLINE | ID: mdl-33549546

ABSTRACT

In the present study, a simple, cheaply and environmental friendly method was evaluated for the synthesis of silver nanoparticle via Cupressus sempervirens L. (CSPE) pollen extract as reducing and stabilizing agent. Various parameters such as volume of CSPE, temperature and reaction time on AgNPs formation were investigated spectrophotometrically to optimize reaction conditions. The electrochemical behavior of the biosynthesized AgNPs were investigated by cyclic voltammetry and square wave voltammetry techniques. An electrosensor based on AgNPs modified glassy carbon electrode were constructed and tested on electro reduction of hydrogen peroxide in phosphate buffer medium. The prepared electrosensor could detect the H2O2 in the range of 5.0 µM - 2.5 mM with a detection limit of 0.23 µM. In addition, the antioxidant activity of biosynthesized AgNPs were evaluated against DPPH free radical. Results obtained from the antioxidant study suggested that CSPE mediated AgNPs exhibit a good antioxidant effect.


Subject(s)
Antioxidants/analysis , Electrochemical Techniques/instrumentation , Metal Nanoparticles/chemistry , Plant Extracts/chemistry , Pollen/chemistry , Silver/chemistry , Cupressus/chemistry , Electrochemical Techniques/methods , Electrodes , Free Radicals/analysis , Hydrogen Peroxide/analysis , Particle Size , Phytochemicals/chemistry , Reproducibility of Results , Spectroscopy, Fourier Transform Infrared , Temperature , X-Ray Diffraction
SELECTION OF CITATIONS
SEARCH DETAIL
...