Pharmacognostic and Phytochemical Insights into Tabernaemontana divaricata Root: Unveiling Bioactive Compounds

Introduction: Tabernaemontana divaricata is a medicinal plant traditionally used to treat inflammation, microbial infections, and neurological disorders. However, comprehensive pharmacognostic and phytochemical data on its root extract remain limited, necessitating standardisation to validate its ethnomedicinal use. Methods: Authenticated roots were subjected to macroscopic, microscopic, and physicochemical analyses following WHO guidelines. The powdered material was exhaustively extracted with ethanol using a Soxhlet apparatus. The extract was profiled via Gas Chromatography–Mass Spectrometry (GC–MS) and Fourier-Transform Infrared Spectroscopy (FTIR). Total phenolic content (TPC) and total flavonoid content (TFC) were quantified, and in vitro antioxidant activity was evaluated using standard assays. Results: Pharmacognostic analysis established key diagnostic characteristics for identification and quality control. GC–MS analysis revealed a complex phytochemical profile with 40 peaks; 15 major compounds were identified, belonging to classes such as siloxanes, phenolic derivatives, terpenoids, fatty acids, and alkaloids. FTIR spectroscopy confirmed functional groups indicative of phenols, alkanes, fatty acids, and flavonoids. The extract showed significant TPC and TFC, correlating with potent, concentration-dependent antioxidant activity. Discussion: The identification of diverse bioactive compounds with known neuroprotective, antioxidant, anti-inflammatory, and antibacterial properties provides strong scientific support for the traditional uses of T. divaricata. The significant antioxidant capacity, likely mediated by the high phenolic and flavonoid content, underscores its potential as a natural therapeutic agent against oxidative stress-related pathologies. This phytochemical evidence bridges the gap between its ethnobotanical applications and modern pharmacological validation. Conclusion: This study provides a validated pharmacognostic and phytochemical profile of T. divaricata root extract. The presence of therapeutically relevant compounds supports its potential for development into standardised herbal formulations and warrants further investigation into specific bioactive constituents and their mechanisms of action.