Green Synthesis of Silver Nanoparticles for Biomedical and Environmental Applications

Background: Multi-drug resistance in bacterial pathogens is a major concern of today. Green synthesis technology is being used to cure infectious diseases. Objectives: The aim of the current research was to analyze the antibacterial, antioxidant, and phytochemical screening of green synthesized silver nanoparticles using Ajuga bracteosa. Methods: Extract of A. bracteosa was prepared by maceration technique. Silver nanoparticles were synthesized using A. bracteosa extract and were confirmed by UV-Vis spectrophotometer, Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The antibacterial, anti-biofilm, cell proliferation inhibition, TLC-Bioautography, TLC-Spot screening, antioxidant, and phytochemical screening were also investigated. Results: UV-Vis spectrum and Scanning electron microscopy confirmed the synthesis of green nanoparticles at 400 nm with tube-like structures. FTIR spectrum showed that functional groups of nanoparticles have a role in capping and stability of AgNP. Agar well diffusion assay represented the maximum antibacterial effect of ABAgNPs against Escherichia coli, Klebsiella pneumoniae, Streptococcus pyogenes, Staphylococcus aureus, and Pseudomonas aeruginosa at 0.10 g/mL concentration compared to ABaqu. Two types of interactions among nanoparticles, aqueous extract, and antibiotics (Synergistic and additive) were recorded against tested pathogens. Crystal violet, MTT, TLC-bio-autography, and spot screening supported the findings of the antibacterial assay. Highest antioxidant potential effect in ABaqu was 14.62% (DPPH) and 13.64% (ABTS) while 4.85% (DPPH) and 4.86% (ABTS) was recorded in ABAgNPs. Presence of phytochemical constituents showed pharmacological importance. Conclusion: It was concluded that green synthesis is an innovative technology in which natural products are conjugated with metallic particles and are used against infectious pathogens. The current research showed the significant use of green nanoparticles against etiological agents.

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Green Synthesis of Silver Nanoparticles Using Citrus Reticulata Juice and Evaluation of their Antibacterial Activity and Cytotoxicity Against Melanoma-B16/F10 Cells

Current Nanoscience ◽

10.2174/1573413711309040007 ◽

2013 ◽

Vol 9 (4) ◽

pp. 457-462 ◽

Cited By ~ 6

Author(s):

T.V.M. Sreekanth ◽

P. Nagajyothi ◽

T.N.V.K.V. Prasad ◽

Kap Lee

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Activity ◽

Green Synthesis ◽

Citrus Reticulata ◽

Melanoma B16

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Green Synthesis of Silver Nanoparticles Capped with Natural Carbohydrates Using Ephedra intermedia

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681206666161006165643 ◽

2017 ◽

Vol 7 (1) ◽

pp. 104-112 ◽

Cited By ~ 5

Author(s):

Alireza Ebrahiminezhad ◽

Saeed Taghizadeh ◽

Aydin Berenjian ◽

Fatemeh Heidaryan Naeini ◽

Younes Ghasemi

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis

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A novel approach towards green synthesis of silver nanoparticles from Bignonia Venusta(L.) for their biocompatibility studies.

International Journal of Pharma and Bio Sciences ◽

10.22376/ijpbs.2017.8.4.b370-377 ◽

2017 ◽

Vol 8 (4) ◽

Author(s):

MANOJ SHARMA ◽

SEEMA INDORA ◽

R.D. AGRA WAL

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Novel Approach

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Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties

Nanomaterials ◽

10.3390/nano11041007 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1007

Author(s):

Azam Ali ◽

Mariyam Sattar ◽

Fiaz Hussain ◽

Muhammad Humble Khalid Tareen ◽

Jiri Militky ◽

...

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Tannic Acid ◽

Rate Constant ◽

Catalytic Properties ◽

Colloidal Dispersion ◽

Alkaline Condition ◽

Core Shell ◽

Average Particle ◽

Ag Nps

The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of silver nanoparticles (Ag NPs) was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized Ag NPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) Ag NPs, capped with poly-tannic acid (Ag NPs-PTA). The average particle size of Ag NPs-PTA was found to be 9.90 ± 1.60 nm. The colloidal dispersion of synthesized nanoparticles was observed to be stable for more than 15 months in the ambient environment (25 °C, 65% relative humidity). The synthesized AgNPs-PTA showed an effective antimicrobial activity against Staphylococcus Aureus (ZOI 3.0 mM) and Escherichia coli (ZOI 3.5 mM). Ag NPs-PTA also exhibited enhanced catalytic properties. It reduces 4-nitrophenol into 4-aminophenol in the presence of NaBH4 with a normalized rate constant (Knor = K/m) of 615.04 mL·s−1·mg−1. For comparison, bare Ag NPs show catalytic activity with a normalized rate constant of 139.78 mL·s−1·mg−1. Furthermore, AgNPs-PTA were stable for more than 15 months under ambient conditions. The ultra-high catalytic and good antimicrobial properties can be attributed to the fine size and good aqueous stability of Ag NPs-PTA. The unique core-shell structure and ease of synthesis render the synthesized nanoparticles superior to others, with potential for large-scale applications, especially in the field of catalysis and medical.

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