RESUMEN
Background: For many years, antimicrobial chemotherapeutic approach have been challenged by drugs resistant bacteria such as Salmonella associated with gastrointestinal infections. To overcome these effects, several attempts by herbalists and traditional healers were in progress, using some plants parts to treat Typhoid fever in Nigeria. Aim: The aim of this work was to determine the antibacterial activity of Senna siamea leaves and Tamarindus indica fruit pulp against multidrug resistant Salmonella typhi. Methods: A total of 168 samples of stool and blood from patients with suspected cases of typhoid fever were collected and only three (3) Salmonella typhi isolates were recovered (from the 168 samples) by conventional microbiological techniques. The isolates were screened for multidrug resistant properties according to Kirby -Bauer disc diffusion method. Water and ethanol were used to extract phytochemical components from powdered leaves of Senna siamea and Tamarindus indica fruit pulp via percolation method. The extracts were tested for the antibacterial activity against the clinical isolates of Salmonella typhi. Results: All the isolates (100%) were resistant to Ampicillin, Amoxicillin, while two (66.7%) to Erythromycin and Tetracycline and sensitive (100%) to Streptomycin, Gentamycin, Nalidixic acid Ciprofloxacin, Cotrimoxazole, Augmentin and Chloramphenicol, The phytochemical screening o of both plants extracts showed the presence of alkaloids, terpenoids, flavonoids, saponins, tannins, carbohydrates and cardiac glycosides. The result shows that aqueous and ethanolic extracts of combined Tamarind and Senna siamea were more active (2.50µg/ml) against Salmonella typhi when compared to individual extracts. Conclusion: This study shows that aqueous and ethanol extracts of both plants exhibited activity on S. Typhi, hence, possess antimicrobial potentials that it can be used in treatment of typhoid.
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Aims@#Senna siamea has various medicinal functions but specific studies pertaining to the antioxidant and antibacterial potential that are related to ultrasound-assisted extraction from S. siamea have not been found to be reported yet. Therefore, this research was to determine antibacterial activities and antioxidant of S. siamea leaf extracts using solvent extraction and ultrasound-assisted extraction. @*Methodology and results@#Antibacterial activities were tested using the disc diffusion method and MIC and MBC values of seven bacterial strains. The ultrasound-assisted extraction extract had a higher yield, total phenolic content, antioxidant activities, and antibacterial activity than solvent extract. Interestingly, the strains of Staphylococcus sp., Vibrio parahaemolyticus, Escherichia coli, and Salmonella enteritidis were not inhibited by the solvent extracts, but were significantly (p < 0.05) inhibited by the ultrasound-assisted extraction extracts. Besides, the MIC and MBC values of extracts from ultrasound-assisted extraction were lower than the extracts from solvent extraction. @*Conclusion, significance and impact of study@#The results revealed that extracts from ultrasound-assisted extraction have higher efficiency to treat bacterial strains due to the efficiency of extraction method towards the recovery and solubility of extractable compounds. The results concluded that the extracted using ultrasound-assisted extraction can be used as active pharmaceutical components for the treatment, prevention, and control of pathogenic bacteria, including to be applied as food ingredients.