Antibacterial activity of new flavanone glycoside isolated from Tradescantia spathacea Sw.

Abstract

Here we are reporting a new bioactive flavanone glycoside. The compound having molecular formula C₂₁H₂₂O₁₁, melting point 123-125°C, and ESI-MS m/z 451 was isolated from the methanolic extract of Tradescantia Spathacea Sw. Its characterization and structure elucidation was done with the help of various chemical degradation, color reactions, and spectral data like UV-Visible, FT-IR, electrospray ionization mass spectrometry technique, nuclear magnetic resonance spectroscopy, etc. It was recognized as 5,7,3’4’-tetrahydroxy flavanone 3’-O-D-mannopyranoside. This study was also designed to examine the efficacy of an isolated compound against various bacteria which are responsible for food spoilage and pathogens in humans. The organic flavanone glycoside of methanolic extract exhibited a promising antibacterial activity towards Escherichia coli (gram negative) MTCC 724, Bacillus subtilis MTCC 441, Staphylococcus aureus MTCC 737, Pseudomonas aerugenosa MTCC 424, and Salmonella typhimurium MTCC 3224. A new flavanone glycoside possesses potent anti-bacterial activity so it can be utilized as a potent source of antibacterial agents for food and pharmaceutical interest.

GRAPHICAL ABSTRACT

Keywords:

• Tradescantia spathacea Sw
• commelinaceae
• flavanone glycoside
• NMR
• mass spectrometry