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The study aimed at evaluating the antibacterial and cytotoxic potential of endophytic bacteria extracts isolated from Solanum torvum Sw (Solanaceae), a plant traditionally used in the treatment of many pathologies such as diarrheal diseases. Isolation of endophytic bacteria was done on supplemented and non-supplemented nutrient media. The extracts of these endophytes were obtained after fermentation in Muller Hinton Broth (MHB). An antibacterial screening of the extracts was carried out on 04 bacterial strains (Staphylococcus aureus, Shigella flexneri, Escherichia coli and Salmonella typhimurium). The strains having demonstrated activity were retained for the determination of the minimum inhibitory concentrations (MIC). The cytotoxicity tests of the extracts were carried out on healthy macrophage cells (Raw 264.7) and healthy kidney cells (Vero). A total of 41 isolates of endophytic bacteria were isolated from S. torvum. The antibacterial screening made it possible to retain 08 extracts which demonstrated antibacterial activity on the S. aureus and S. flexneri strains with MICs ranging from 100 to 200 μg/ml. All extracts exhibited weak cytotoxic activity except for one extract. Extracts of endophytic bacteria isolated from S. torvum showed antibacterial activity and low cytotoxicity on the pathogenic strains tested. This study shows that the endophytic bacteria of S. torvum are a source of antibacterial compounds to be explored to enrich the therapeutic arsenal against bacterial infections.

The study aimed at evaluating the alpha-glucosidase inhibitory potential of extracts of endophytic bacteria isolated from Ludwigia octovalvis (Jacq.) P. H. Raven (Onagraceae). Isolation of endophytic bacteria was done on supplemented and non-supplemented nutrient agar. The extracts of these endophytes were obtained after fermentation in Mueller-Hinton Broth (MHB). The inhibitory effect on the alpha-glucosidase enzyme of the extracts of endophytic bacteria was determined in the presence of starch and sucrose at 6 mg/mL at 37°C and by measuring the absorbance at 517 nm. Nineteen endophytic bacteria were isolated from the leaves, stems, roots, flowers, fruits and twigs of L. octovalvis. The extracts obtained from these endophytic bacteria all showed an alpha-glucosidase inhibitory effect. The S4155 extract showed less than 50% enzyme inhibitory activity with an IC50 of 163.98 μg/mL. Endophyte bacteria associated with L. octovalvis provided a source of bioactive compounds that can prevent or reduce the prevalence of diabetes.

Objectif : L’étude menée a été de contribuer à l’évaluation de la toxicité aiguë et subaiguë de l’extrait au vin depalme des graines de Cucurma longa Linn. (cucurma)Méthodologie et Résultats : L’extrait a subi un screening phytochimique et sa qualité microbiologique approuvéesuivant la Pharmacopée Européenne. L’essai de toxicité aiguë a été mené sur des souris femelles de Musmusculus à la dose 2000 mg/kg. L’essai de toxicité subaiguë a été réalisé sur une période de 28 jours, avec 4lots de 6 rats (3 mâles et 3 femelles albinos de la souche Wistar). Le lot I a reçu 1 ml/100 g d’eau distillée et les lots II, III et IV l’extrait aux doses 200, 400 et 800 mg/kg respectivement. Le screening phytochimique a révélé la présence d’alcaloïdes, de tanins, phénols et sucres réducteurs. Les tests de qualité microbiologique n’ont révélé aucun germe. L’administration à dose unique de l’extrait n’a entrainé aucun décès. La DL50 de l’extrait est donc supérieure à 2000 mg/kg. A doses répétées pendant 28 jours, l’extrait a contribué à une croissance pondérale non significative chez les rats à toutes les la doses chez les rats mâles et femelles. En outre, il a engendré également chez une augmentation de l’aspartate aminotransférase (ASAT) et de l’alanine aminotransférase (ALAT) aux trois doses de l’extrait chez les deux.Conclusion et Application : L’étude a permis de montrer que l’extrait au vin de palme des rhizomes de Curcuma longa Linn. a une DL50 supérieure à 2000 mg/kg et est favorable à la production d’un médicament traditionnel amélioré, après les tests précliniques et cliniques.Mots clés : Curcuma longa, rhizomes, vin de palme, toxicité, souris, rats Study of acute and subacute toxicity of extract from the palm wine of rhizomes of Curcuma longa Linn.Objective: The study was to contribute to the evaluation of the acute and subacute toxicity of the palm wine extract of seeds of Carica papaya Linn.Methodology and Results: The extract underwent a phytochemical screening and its microbiological qualityapproved according to the European Pharmacopoeia. The acute toxicity test was conducted in female Mus musculus mice at a dose of 2000 mg/Kg. The subacute toxicity test was conducted over a 28-day period, with 4 batches of 6 rats (3 males and 3 albinos of the Wistar strain). Lot I received 1 mL/100 g of distilled water and lots II, III and IV extracted at doses of 200, 400 and 800 mg/Kg respectively. Phytochemical screening revealed the presence of alkaloids, tannins, phenols and reducing sugars. Microbiological quality tests revealed no contamination. The single-dose administration of the extract resulted in no deaths. The LD50 of the extract was therefore greater than 2000 mg/Kg. At repeated doses for 28 days, the extract contributed to insignificant weight growth in rats at all dose levels in male and female rats. In addition, it also resulted in an increase of ASAT andALAT at all three doses of the extract in both.Conclusion and Application: The study showed that the palm wine extract of Curcuma longa Linn rhizomes has an LD50 greater than 2000 mg/Kg and is favorable to the production of an improved traditional medicine, after the preclinical and clinical tests.Keywords: Curcuma longa, rhizomes, palm wine, toxicity, mice, rats