Green biosynthesis of silver nanoparticles using Dregea volubilis flowers: Characterization and evaluation of antioxidant, antidiabetic and antibacterial activity

Abstract

The present work was conducted to biofabricate silver nanoparticles (AgNPs) in single step employing aqueous extract of Dregea volubilis flowers and to investigate its antioxidant, antidiabetic and antibacterial activities. The AgNPs were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectrometry, high resolution transmission electron microscopy (HRTEM) and zeta potential study. The biofabricated AgNPs showed potential antioxidant activity for scavenging DPPH radical (IC₅₀, 40.45 ± 5.06 μg/mL), ABTS radical (IC₅₀, 78.49 ± 1.41 μg/mL), total antioxidant capacity (148.83 ± 2.99 mg GAE/g) along with remarkable inhibitory effects on α-amylase (IC₅₀, 10.62 ± 0.22 μg/mL) and α-glucosidase (IC₅₀, 6.49 ± 0.03 μg/mL). The AgNPs showed notable antibacterial activity in terms of zone of inhibition (in mm) against Pseudomonas aeruginosa (10.67 ± 0.44), Escherichia coli (9.33 ± 0.44), Bacillus subtilis (14.67 ± 0.60) and Staphylococcus aureus (15.67 ± 0.60).

Keywords:

• Silver nanoparticles
• Dregea volubilis flower
• antioxidant activity
• α-Glucosidase inhibitory activity
• α-Amylase inhibitory activity

Acknowledgements

The authors are thankful to the University Grants Commission, New Delhi for providing the instrumental facilities under UGC-UPE Phase–II programme at the Department of Pharmaceutical Technology, Jadavpur University, Kolkata. The authors acknowledge Centre for Research in Nanoscience and Nanotechnology (CRNN), Kolkata for HRTEM study.

Disclosure statement

The authors declare no potential conflict of interest.