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Silver-Protein Nanocomposites as Antimicrobial Agents
- Source :
- Nanomaterials, Vol 11, Iss 3006, p 3006 (2021), Nanomaterials, Volume 11, Issue 11
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The use of nanomaterials alone or in composites with proteins is a promising alternative to inhibit pathogenic bacteria. In this regard, this study used seed proteins from both fenugreek (Trigonella foenum-graecum L.) (FNP) and mung bean (Viga radiate) (MNP), with silver nanoparticles (Ag-NPs) and nanocomposites of either Ag-NPs plus FNP (Ag-FNP) or Ag-NPs plus MNP (Ag-MNP) as inhibitory agents against pathogenic bacteria. FNP and MNP were isolated from fenugreek seeds and mung bean seeds, respectively, and fractionated using Sodium Dodecyl Sulfate–Polyacrylamide Gel Electrophoresis (SDS–PAGE). Both FNP and MNP were immobilized with Ag-NPs to synthesize the nanocomposites Ag-FNP and Ag-MNP, respectively. The physicochemical characteristics of Ag-NPs and their composites with proteins were studied by X-ray Diffraction (XRD), dynamic light scattering (DLS), the zeta potential, Scanning and Transmission Electron Microscopy (SEM and TEM, respectively), Atomic Force Microscopy (AFM), and the Brunauer–Emmett–Teller isotherm (BET), elucidating their structural parameters, size distribution, size charges, size surface morphology, particle shape, dimensional forms of particles, and specific surface area, respectively. The sole proteins, Ag-NPs, and their nanocomposites inhibited pathogenic Gram-positive and Gram-negative bacteria. The inhibitory activities of both nanocomposites (Ag-FNP and Ag-MNP) were more than those obtained by either Ag-NPs or proteins (FNP, MNP). Minimum inhibitory concentrations (MICs) of Ag-FNP were very low (20 and 10 µg mL−1) against Salmonellatyphimurium and Pseudomonasaerugenosa, respectively, but higher (162 µg mL−1) against E. coli and Listeriamonocytogenes. MICs of Ag-MNP were also very low (20 µg mL−1) against Staphylococcusaureus but higher (325 µg mL−1) against Listeriamonocytogenes. TEM images of Staphylococcusaureus and Salmonellatyphimurium, treated with Ag-FNP and Ag-MNP, at their MIC values, showed asymmetric, wrinkled exterior surfaces, cell deformations, cell depressions, and diminished cell numbers.
- Subjects :
- Gel electrophoresis
silver nanoparticles
Trigonella
biology
nanocomposite
Chemistry
General Chemical Engineering
technology, industry, and agriculture
mung bean
biology.organism_classification
Silver nanoparticle
Article
fenugreek
Dynamic light scattering
antibacterial activity
Specific surface area
Zeta potential
General Materials Science
seed proteins
Antibacterial activity
QD1-999
Bacteria
Nuclear chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 11
- Issue :
- 3006
- Database :
- OpenAIRE
- Journal :
- Nanomaterials
- Accession number :
- edsair.doi.dedup.....e099fb377f2e480b8818b56f78041878