Anhydronium bases from Rauvolfia serpentina.

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Pharmacognosy

Background:

• Rauvolfia serpentina is a plant species known for its rich source of bioactive alkaloids.
• Anhydronium bases are a class of alkaloids with potential pharmacological significance.
• Previous research has identified various compounds from Rauvolfia serpentina, but the exploration of its anhydronium base content remains ongoing.

Purpose of the Study:

• To isolate and characterize anhydronium bases from a methanolic extract of Rauvolfia serpentina roots.
• To identify novel anhydronium bases from a natural source for the first time.
• To contribute to the understanding of the phytochemical diversity of Rauvolfia serpentina.

Main Methods:

• Preparative High-Performance Liquid Chromatography (HPLC) was employed for the isolation of compounds.
• Structural elucidation of the isolated compounds was performed using Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 13C), Mass Spectrometry (MS), and Ultraviolet (UV) spectroscopy.

Main Results:

• Five anhydronium bases were successfully isolated from the methanolic extract.
• Four of these compounds, 3,4,5,6-tetradehydroyohimbine, 3,4,5,6-tetradehydro-(Z)-geissoschizol, 3,4,5,6-tetradehydrogeissoschizol, and 3,4,5,6-tetradehydrogeissoschizine-17-O-beta-D-glucopyranoside, were identified from a natural source for the first time.
• The known anhydronium base serpentine was also isolated and identified.

Conclusions:

• The study successfully identified five anhydronium bases from Rauvolfia serpentina roots, including four previously undiscovered natural products.
• The structural characterization confirms the presence of these novel compounds in nature, expanding the known alkaloid profile of the plant.
• These findings enhance the phytochemical database of Rauvolfia serpentina and may provide a basis for future pharmacological investigations.