Rapid biosynthesis of Bauhinia variegata flower extract-mediated silver nanoparticles: an effective antioxidant scavenger and α-amylase inhibitor

Artif Cells Nanomed Biotechnol. 2018 Nov;46(7):1488-1494. doi: 10.1080/21691401.2017.1374283. Epub 2017 Sep 8.

Abstract

Silver nanoparticles (AgNPs) were biosynthesized using Bauhinia variegata flower extract (BVFE). The BVF-AgNPs was found to be spherical shaped with the size of 5-15 nm. The phytoconstituents analysis and FTIR spectrum indicated that bioactive compounds like, phenols, flavonoids, benzophenones, nitro compounds, aromatics and aliphatic amines from BVFE might absorb on the surface of BVF-AgNPs. The synthesized BVF-AgNPs showed potent antioxidant property and α-amylase enzyme activity inhibition. The IC50 value of BVF-AgNPs was found to be 4.64 and 16.6 µg/ml for DPPH and ferric reducing power assay, respectively. The IC50 value of BVF-AgNPs for α-amylase inhibition was found to be 38 µg/ml. The Ki value of BVF-AgNPs for α-amylase inhibitory effect was found to be 21 µg/ml with the non-competitive mode of inhibition. These results suggest that BVF-AgNPs might be an effective nano-drug to treat diabetic conditions.

Keywords: Bauhinia variegata; anthocyanins; antioxidant activity; silver nanoparticles; α-amylase.

MeSH terms

  • Antioxidants / chemistry
  • Antioxidants / metabolism
  • Antioxidants / pharmacology
  • Bauhinia / chemistry*
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / metabolism
  • Enzyme Inhibitors / pharmacology
  • Flowers / chemistry*
  • Metal Nanoparticles / chemistry*
  • Plant Extracts / metabolism*
  • Silver / chemistry*
  • Silver / metabolism
  • Silver / pharmacology*
  • alpha-Amylases / antagonists & inhibitors*

Substances

  • Antioxidants
  • Enzyme Inhibitors
  • Plant Extracts
  • Silver
  • alpha-Amylases