Biosynthesized AgNPs using Catharanthus roseus and their antibacterial efficacy in synergy with antibiotics; A future advancement in nanomedicine

  • Dr. Monika Gupta Amity University, Madhya Pradesh

Abstract

This research work develops an approach to synthesize silver nanoparticles by reduction of leaf extract of Catharanthus roseus plant. This study produces synthesized nanoparticles that have process-controlled attributes which make their antibiotic action highly efficient. These attributes include smaller size, proper morphology, uniform dispersion, metal ion content, formation of functional groups etc. By optimizing the reduction process parameters, AgNPs gain the desired properties. The biosynthesis of AgNPs process was performed by using reaction of 10% (w/v) C. roseus leaf extract with AgNO3. The optimum conditions and concentration used for synthesis of nanoparticles were: 1 mM AgNO3, pH 5, temperature 80 0 C with an incubation time of 72 hrs. All the above parameters were analysed by UV-visible spectrophotometer with the surface plasmon resonance peak obtained at 440 nm. Various characterization techniques were performed viz. SEM, EDX, TEM, Photoluminescence study, XRD, FTIR, DLS and AFM. The results obtained from characterization confirmed the spherical morphology of the nanoparticles with size between 50-87 nm. In the current investigation, the antimicrobial activity of biosynthesized AgNPs was also determined using MIC and ZOI methods against six different bacteria at different doses of AgNPs (100, 150, and 200 µg/ml) alone and also in combination with antibiotic- Streptomycin. The results revealed that high concentration of AgNPs inhibits the bacterial growth. Also AgNPs revealed much stronger antibacterial action in synergy with Streptomycin against antibiotic-resistant bacteria.

Keywords: Biosynthesis; Physical parameters; UV-Vis. Spectroscopy; Characterization; Antimicrobial activity.

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Gupta, D. M. “Biosynthesized AgNPs Using Catharanthus Roseus and Their Antibacterial Efficacy in Synergy With Antibiotics; A Future Advancement in Nanomedicine”. Asian Journal of Pharmaceutical and Clinical Research, Vol. 14, no. 2, Feb. 2021, https://innovareacademics.in/journals/index.php/ajpcr/article/view/39856.
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