Antimicrobially active alkaloids from Tabernaemontana chippii.

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacognosy

Background:

• Tabernaemontana chippii is a plant source of diverse alkaloids.
• Alkaloids from natural sources are investigated for medicinal properties.

Purpose of the Study:

• To isolate and characterize alkaloids from Tabernaemontana chippii root bark.
• To evaluate the antimicrobial activity of the isolated dimeric alkaloids.

Main Methods:

• Alkaloid isolation using chromatographic techniques.
• Structure elucidation via spectral data analysis (e.g., NMR, MS) and co-thin-layer chromatography (co-tlc).
• Antimicrobial activity testing against various bacterial strains.

Main Results:

• Forty-five alkaloids were isolated from the root bark.
• Thirty-four alkaloids were fully characterized, including eight new compounds, four of which are 3-hydroxy derivatives of dimeric voacamine type alkaloids.
• Eleven minor alkaloids were partially elucidated, mostly new.
• Dimeric alkaloids exhibited strong antimicrobial activity against Gram-positive bacteria and moderate to weak activity against Gram-negative bacteria.

Conclusions:

• Tabernaemontana chippii is a rich source of structurally diverse alkaloids.
• The isolated dimeric alkaloids possess notable antimicrobial properties, suggesting potential therapeutic applications.