Antimicrobial activity of flavonoids

Area of Science:

• Natural Products Chemistry
• Microbiology
• Pharmacology

Background:

• Flavonoids are widespread plant compounds with historical medicinal use.
• Emerging research highlights their potential as antifungal, antiviral, and antibacterial agents.
• Synergistic effects between flavonoids and existing antimicrobials have been observed.

Purpose of the Study:

• To review the current state of antibacterial flavonoid research.
• To investigate the structure-activity relationships of antibacterial flavonoids.
• To elucidate the mechanisms of action of selected antibacterial flavonoids.

Main Methods:

• Literature review of high-quality investigations on antibacterial flavonoids.
• Analysis of structure-activity relationships.
• Examination of proposed antibacterial mechanisms of action for various flavonoids.

Main Results:

• Conflicting reports on antibacterial activity exist, likely due to assay variations.
• Consistent findings emerge regarding structure-activity relationships.
• Several flavonoids exhibit antibacterial activity through diverse mechanisms, including DNA gyrase inhibition, cytoplasmic membrane disruption, and energy metabolism interference.

Conclusions:

• Flavonoids represent a promising class of natural products for antimicrobial drug development.
• Further research into their mechanisms of action could lead to novel antimicrobial agents.
• Standardized testing is needed to resolve conflicting activity reports.