Title:Formulation of Garlic Essential Oil-assisted Silver Nanoparticles and Mechanistic Evaluation of their Antimicrobial Activity against a Spectrum of Pathogenic Microorganisms
Volume: 24
Issue: 22
Author(s): Ashirbad Sarangi, Bhabani Shankar Das, Lipsa Leena Panigrahi, Manoranjan Arakha*Debapriya Bhattacharya*
Affiliation:
- Centre for Biotechnology, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, Odisha, 751003, India
- Centre for Biotechnology, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, Odisha, 751003, India
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal,
India
Keywords:
Green synthesis, Garlic essential oil, Silver nanoparticles, Antimicrobial activity, Antibiofilm activity, Reactive oxygen species.
Abstract:
Background: The synthesis of nanoparticles using the principle of green chemistry has
achieved huge potential in nanomedicine. Here, we report the synthesis of silver nanoparticles (Ag-
NPs) employing garlic essential oil (GEO) due to wide applications of GEO in the biomedical and
pharmaceutical industry.
Objective: This study aimed to synthesise garlic essential oil-assisted silver nanoparticles and present
their antimicrobial and antibiofilm activities with mechanistic assessment.
Method: Initially, the formulation of AgNPs was confirmed using different optical techniques,
such as XRD, FT-IR, DLS, zeta potential, SEM, and EDX analysis, which confirmed the formulation
of well-dispersed, stable, and spherical AgNPs. The antimicrobial and antibiofilm activity of
GEO-assisted AgNPs was evaluated against a spectrum of pathogenic microorganisms, such as
Gram-positive (S. aureus and B. subtilis) and Gram-negative (E. coli and P. aeruginosa) bacteria.
Results: The AgNPs exhibited remarkable antimicrobial and anti-biofilm activity against all tested
strains. The mechanism behind the antimicrobial activity of AgNPs was explored by estimating
the amount of reactive oxygen species (ROS) generated due to the interaction of AgNP with bacterial
cells and observing the morphological changes of bacteria upon AgNP interaction.
Conclusion: The findings of this study concluded that ROS generation due to the interaction of
AgNPs with bacterial cells put stress on bacterial membranes, altering the morphology of bacteria,
exhibiting remarkable antimicrobial activity, and preventing biofilm formation.
