STABILIZATION AND PHYTOCHEMICAL PROFILING OF ACTIVE SECONDARY METABOLITES FROM PARAMERIA LAEVIGATA (APOCYNACEAE) LEAF EXTRACTS FOR FUNCTIONAL HEPATOPROTECTIVE APPLICATIONS

Abstract

This study evaluates the thin-layer desorption kinetics, isolation-stabilization parameters, and bioactive efficacy of secondary metabolites from Parameria laevigata leaf matrices, mapping its chemical potential as a functional hepatoprotective beverage. Fresh biomass was processed using forced-convection thermal drying at 125°F for 4 hours and 140°F for 3 hours, with both regimes reaching a stable moisture desorption equilibrium at a 74% mass reduction (5% residual moisture). Phytochemical profiling and multi-laboratory screening confirmed that the low-temperature 125°F parameters protected fragile organic compounds from thermal oxidation, safely preserving high concentrations of total flavonoids, saponins, and condensed tannins along with essential micronutrients. Blind sensory screening by 19 independent evaluators confirmed that this gentle drying profile optimized the preservation of natural volatile compounds, yielding a darker color liquor, enhanced solute extraction, and superior aromatic qualities. Preclinical in vivo assays using carbon tetrachloride (CCl₄)-induced hepatotoxicity models in male Sprague Dawley rats confirmed that a 100% concentration of the natural product extract completely blunted pathological serum enzyme elevations (SGOT and SGPT), maintaining baseline levels within normal parameters (p < 0.05). Microscopic histopathological reviews corroborated this systemic protection, showing that the isolated polyphenolic and metabolite matrix effectively prevented lobular disarray, severe necrosis, and vascular space dilatation, exhibiting structural tissue regeneration equal to the standard clinical reference drug Silymarin (100 mg/kg). These findings validate the natural product chemistry profile of P. laevigata as a stable, standardized, and highly viable bio-accessible formulation for targeted hepatoprotection.