Two antimicrobial alkaloids from Bocconia arborea.

Area of Science:

• Natural Product Chemistry
• Microbiology
• Pharmacology

Background:

• Bocconia arborea is a plant source of bioactive compounds.
• Alkaloids are known for diverse biological activities, including antimicrobial properties.
• Identifying novel antimicrobial agents is crucial for combating infectious diseases.

Purpose of the Study:

• To isolate and identify antimicrobial constituents from Bocconia arborea.
• To evaluate the antimicrobial spectrum and potency of isolated compounds.
• To characterize the chemical structures of the active compounds.

Main Methods:

• Bioactivity-guided fractionation using thin-layer bioautography.
• Isolation of two known benzophenanthridine alkaloids: dihydrochelerythrine and dihydrosanguinarine.
• Determination of minimal inhibitory concentrations (MICs) via serial dilution assays.
• Structural elucidation using 1H and 13C Nuclear Magnetic Resonance (NMR) analyses.

Main Results:

• Two alkaloids, dihydrochelerythrine and dihydrosanguinarine, were isolated from Bocconia arborea.
• Both compounds demonstrated considerable antimicrobial activity against Gram-positive bacteria, Gram-negative bacteria, and Candida albicans.
• MIC values were determined for each isolated alkaloid, quantifying their potency.

Conclusions:

• Dihydrochelerythrine and dihydrosanguinarine are key antimicrobial agents from Bocconia arborea.
• These benzophenanthridine alkaloids represent potential leads for developing new antimicrobial therapies.
• Further research into their mechanism of action and in vivo efficacy is warranted.