Phytochemicals

Phytochemical and Antibacterial Evaluations of the Stem Bark of Newbouldia laevis against Isolates from Infected Wounds and Eyes

Publisher / Conference Name
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Nigeria - Tropical Journal of Pharmaceutical Research (Trop J Pharm Res)
Abstract / Summary
Purpose: To examine the phytochemical constituents and verify the ethnomedical claim of Newbouldia laevis (P.Beauv.) Seeman ex Bureau Bignoniaceae in treating septic wounds and eye problems. Methods: Applying standard methods, the phytochemical constituents of the stem bark were examined while the antibacterial potentials of the methanol extract of the stem bark and its organic solvent fractions were tested on clinical bacterial isolates from infected wounds and eyes using the agar - well diffusion method. Ciprofloxacin and gentamicin were used as standard controls. The time-kill kinetics of the methanol stem bark extract and ciprofloxacin were determined using isolates of Staphyloccocus aureus.

Results: Phytochemical screening of the stem bark revealed the presence of flavonoids, tannins, saponins and alkaloids with no traces of cyanogenic glycosides. The 65 bacterial pathogens isolated included Proteus mirabilis (26.0 %) and Pseudomonas aeurginosa (17.4 %) from non-diabetic patients’ wounds; Staphylococcus aureus (32.0 %) and Escherichia coli (16.0%) from diabetic patients’ wounds; Staphylococcus aureus (35.3%) and Pseudomonas aeruginosa (35.3 %) from infected eyes. The chloroform fraction was observed to be more active on Gram- negative organisms while the aqueous fraction was more active on Gram-positive organisms. Time-kill kinetics of Staphylococcus aureus showed that the extract was bactericidal (99.9 % killing) at MIC and 2 x MIC after 24 and 3 hours, respectively.

Conclusion: The study has established that the stem bark of Newbouldia laevis has antibacterial activities against bacterial isolates from infected wounds and eyes as claimed in ethnomedicinal practice.

Year of Publication
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REPRODUCTIVE TOXICOLOGICAL EFFECTS OF AQUEOUS EXTRACT OF Acanthus montanus (Nees) T. Anderson IN WISTAR RATS

Year of Publication
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Publication Type
Abstract
Acanthus montanus, commonly referred to as "beer's breech," "alligator plant," or "mountain thistle," is a potent medicinal plant that belongs to the Acanthaceae family. It holds significant importance in ethnomedicine. Throughout Nigeria's history, it has been utilized for managing a diverse array of health issues including wounds, gonorrhea, heart failure, and more. Acanthus montanus is rich in phytochemicals, including alkaloids, saponins, flavonoids, tannins, glycosides, and terpenoids. These compounds exhibit diverse biological and pharmacological properties, encompassing analgesic, anti-inflammatory, immunological, anti-fertility, antidiabetic, hepatoprotective, and hepatocurative activities. This study investigated the reproductive toxicological effects of aqueous leaf extracts of Acanthus montanus on male and female Wistar rats. Extracts were administered at varying doses (200 mg/kg, 400 mg/kg, and 800 mg/kg) and 0.5 ml of distilled water as control. The body and organ weights (testes, penis, uterus, ovaries) demonstrated no significant deviations from the control group. Toxicological assessments revealed no adverse impacts on lipid metabolism, as evidenced by lipid profile assays. Hormonal analyses affirmed that the extracts maintained endocrine equilibrium, with hormone levels within normal ranges in all make treated groups, while the female groups exhibited varying level of fluctuations in their hormonal levels. Antioxidant assays disclosed noteworthy antioxidant effects, particularly at the highest dose (800 mg/kg), reflecting the potential of Acanthus montanus extracts to combat free radicals and uphold cellular integrity. Histological evaluation of reproductive organs unveiled no notable structural changes, indicating the extracts' non-induction of tissue damage or morphological aberrations. In conclusion, aqueous leaf extracts of Acanthus montanus, across various dosages, exhibited negligible impact on body and organ weights, reflecting safety. Moreover, they displayed antioxidant properties without compromising reproductive health or lipid metabolism. This underlines the promising prospects of Acanthus montanus extracts as natural antioxidants in the realms of reproductive health and oxidative stress management. While these findings are encouraging, further research across diverse animal models and potentially human subjects is imperative for a comprehensive understanding of the plant's benefits and mechanisms
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