Pharmacognostic Evaluation of leaf of Newbouldia laevis (P.Beauv.) Seem. Ex Bureau (BIGNONIACEAE)

Résumé

consisting of the species commonly called boundary tree. It’s medicinal properties including antiulcer, antimicrobial, anticancer and antidiabetic activities. This study is aimed at evaluating pharmacognostic parameters which include: microscopy, micromeritics, chemomicroscopy, moisture content, ash values, extractive values,and fluorescence

Methods: Standard procedures were used to evaluate these Parameters

Results:The results obtained was that the leaf  has hypostomatic distribution of stomata, that is stomata were found only on one surface of the leaf, the abaxial surface,which include anomocytic, anisocytic, and anomalous types of stomata, and glandular trichomes were present, then for the adaxial surface,stomata was absent, trichomes were also absent. stomatal index for abaxial surface was 27.31% and no values for the adaxial surface.The micromeritic evaluation of powdered drugs were, the bulk and tapped volumes, bulk and tapped densities were determined to be 44.66 ± 2.27, 30.05(mL)  and 0.22 ± 0.01, 0.32 ± 0.004(g/mL) respectively. Subsequently, the Hausner ratio and Carr’s index were 1.47± 0.09 and 31.83 ± 4.46% respectively. From the experiment, Carr’s index and Hausner’s ratio of the leaf was greater than 25 % and 1.25 respectively and therefore indicates that the leaf powder has a poor flow property.The angle of repose was recorded to be 43.50^o.The moisture content was 12.7% ^w/_w.Chemomicroscopy identified mucilage, lignin, starch, oil,cellulose and protein, while fluorescence analysis revealed solvent-dependent color variations. 

Conclusion: These findings support the identification and authentication of N. laevis, establishing standards for quality, purity, safety, and efficacy in Herbal medicine.