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Objective: Present work involve study of the toxicity and the antitrypanosomal activity of the hemi syntheses (total of thiosemicarbazones) extracted from the substrates (reagents of thiosemicarbazides) in 1N hydrochloric acid medium from Mitracarpus Scaber harvested in the region of Abomey-calavi. Methods: The ethanolic, dichloromethane and hydroethanol extracts (50:50 v/v) yielded the alkaloid extracts with yields of 4.44%, 2.48% and 5.08% respectively leading to three products of hemi-synthesis P1, P2 and P3 whose larval toxicities have respective values LC50: 78.1μg/mL, 95μg/mL, and 48.8 μg/mL whereas the toxicity tests of the alkaloid samples of ethanol, dichloromethane and hydroethanolic E1, E2 and E3 extracted from the evaluation of the same larval toxicity test gave values of 83.41μg/mL 102.51μg/mL and 52.91μg/mL respectively. Results: Results were less toxic than those of semisynthetic products. Acute and sub-acute toxicity in non-pregnant NMRI female mice after oral gavage of P2 product has been shown to be non-toxic. The antitrypanosomal test was carried out according to the Alamar blue method, it revealed that P1 moderately inhibits trypanosome parasites (IC50=18.06 μg/mL) as well as P2 and P3 with a respective IC50 of 17.24 μg/mL and 20, 68 μg/mL while the alkaloid totals had lower antitrypanosomal activity than the hemisynthesis products. Conclusion: Study concludes that, shrimp larvae were tolerant of ethanolic, dichloromethane and hydroethanolic extracts and therefore the leafy stems of the plant do not have a priori harmful effects on human cells 9 PS, 9 KB, A-549 and HT-29.

TOXICITY AND ANTITRYPANOSOMAN ACTIVITY OF HEMI SYNTHESIS PRODUCTS OBTAINED FROM BIOACTIVE COMPOUNDS OF MITRACARPUS SCABER HARVESTED SOUTH OF BENIN