Inhibitory effect of quercetin on periodontal pathogens

Area of Science:

• Microbiology
• Pharmacology
• Periodontology

Background:

• Periodontal disease, linked to bone loss, complicates orthodontic treatment.
• Key pathogens include Actinobacillus actinomycetemcomitans (Aa) and Porphyromonas gingivalis (Pg).
• Quercetin, a flavonoid in common foods, may possess antimicrobial properties against these bacteria.

Purpose of the Study:

• To investigate the in vitro antimicrobial effects of quercetin.
• To assess quercetin's impact on the growth of periodontal pathogens Aa and Pg.

Main Methods:

• In vitro broth dilution assay used to determine antimicrobial effects.
• Bacteria (Aa and Pg) incubated with varying quercetin concentrations (0.025–0.1 g/mL).
• Chlorhexidine and NaCl served as positive and negative controls, respectively; growth assessed over 24 hours.

Main Results:

• Quercetin demonstrated potent antimicrobial activity against both Aa and Pg.
• Inhibition of bacterial growth was observed as early as 1 hour.
• Complete inhibition of Pg was achieved by 24 hours at all tested quercetin concentrations; Aa showed transient inhibition.

Conclusions:

• Quercetin exhibits significant inhibitory effects on Aa and Pg growth in vitro.
• Quercetin's efficacy is comparable to chlorhexidine, suggesting its potential as a therapeutic agent for periodontal infections.