Browsing by Author "Mbwambo, Zakaria H."

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    In Vivo Antiviral Activity, Protease Inhibition and Brine Shrimp Lethality of Selected Tanzanian Wild Edible Mushrooms
    (2010-07) Kidukuli, Abdul W.; Mbwambo, Zakaria H.; Malebo, Hamisi M.; Mgina, Clarence A.; Mihale, Matobola J.
    In endeavor to have detailed account of nutritional, medicinal and pesticidal potentials of Tanzanian wild mushrooms, a study was conducted to assess the antiviral and protease activities of five edible species: Cantharellus platyphyllus and C. isabellinus from genus Cantharellus and Pleurotus djamour, P. sajor-caju and P. citrinopileatus from genus Pleurotus. Methanolic extracts were subjected to cytotoxicity lethality tests against Artemia salina Leach according to Meyer et al., (1982), in vivo antiviral tests using embryonated chicken eggs and protease tests using Screen to Nature methods. C. platyphyllus extracts had the highest cytotoxicity activity among Cantharellus species (LC50 = 7.846 ?g/ml) and of all tested species. P. citrinopileatus extracts had highest cytotoxicity (LC50 = 12.807 ?g/ml) among Pleurotus species. C. isabellinus and P. djamour extracts had stronger antiviral activities against both pox virus and infectious bursa disease virus. Other tested mushrooms showed moderate antiviral activities. All tested species showed non protease activities. While the Cantharellus species showed no protease inhibition property, Pleurotus species inhibited protein degradation similar to protease inhibitor. From these observations, the use of mushrooms as food and therapeutic substances particularly in HIV/AIDS infected persons is highly encouraged. It is recommended that further studies involving detailed biological activities (including antimicrobial, antioxidant and pesticidal activities) and determination of chemical compositions of Tanzanian wild edible mushrooms be done as the knowledge will contribute to the existing knowledge on these useful macro fungi.
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    Screening of Traditionally Used Tanzanian Medicinal Plants for Antifungal Activity
    (2009) Kisangau, Daniel P.; Hosea, Ken M.; Lyaruua, Herbert V. M.; Joseph, Cosam C.; Mbwambo, Zakaria H.; Masimba, Pax J.; Gwandu, Catherine B.; Bruno, L. N.; Devkota, Krishna P.; Sewald, Norbert
    Fungal infections represent a significant cause of morbidity and mortality especially in immunocompromised patients in the world today. Dichloromethane (DM) and aqueous (W) extracts of nine plants used traditionally for the treatment of fungal infections in Bukoba rural district in Tanzania were screened for antifungal activity against Candida albicans, Cryptococcus neoformans, and Aspergillus niger using agar well and disk diffusion methods. Dichloromethane extracts of Capparis erythrocarpos [CE] Isert (Capparaceae), Cussonia arborea [CA] Hochst. Ex A. Rich (Araliaceae), Dracaena steudneri [DS] Engl. (Dracaenaceae), Lannea schimperi [LS] (A. Rich) Engl. (Anacardiaceae), Rauvolfia vomitoria [RV] Afz (Apocynaceae), and Sapium ellipticum [SE] (Krauss) Pax (Euphorbiaceae) showed activity against all three fungi. Extracts of Rumex usambarensis [RU] (Dammer) Dammer (Polygonaceae) and Zehneria scabra [ZS] (L.f.) Sond. (Cucurbitaceae) had an activity limited to only one or two of the test organisms. Rhoicissus tridentata [RT] (L.f.) Wild & Drum (Vitaceae) was the only plant without activity. Fractions of the active extracts CE, CA, DS, LS, and SE exhibited higher antifungal activity against one or more of the three fungi. Four compounds isolated from S. ellipticum also exhibited antifungal activity against one or more of the three fungi. The minimum inhibitory concentrations (MICs) and minimum fungicidal concentrations (MFCs), determined using the microplate assay method, ranged between 0.4 and 50.0 μg/mL for crude extracts, 1.6 and 50.0 μg/mL for semi-purified fractions, and 0.12 and 1.0 μg/mL for pure compounds, as compared to 0.016–1.5 μg/mL for fluconazole. We confirm the potential of traditionally used plants as a source of new drugs for treatment of fungal infections.
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    Traditional Knowledge, Use Practices and Conservation of Medicinal Plants for HIV/AIDS Care in Rural Tanzania
    (2011) Kisangau, Daniel P.; Herrmann, Thora M.; Lyaruu, Herbert V. M.; Hosea, Ken M.; Joseph, Cosam C.; Mbwambo, Zakaria H.; Masimba, Pax J.
    HIV/AIDS pandemic is currently the most socio-economic challenge that faces Tanzania as it affects mostly the young and most economically productive population. People living with HIV/AIDS in Tanzania are susceptible to fungal and bacterial opportunistic infections, which are a major cause of mortality and morbidity in the country. Despite the government's intervention to provide ARVs to people living with HIV/AIDS, many of them especially those living in the rural areas can neither afford them due to poverty nor access them due to distance to health centers. Moreover, resistance of opportunistic microbial pathogens to conventional medicines and the serious side effects associated with antiretroviral drugs are also a major drawback to the management of HIV/AIDS in the country. Due to these factors, many people opt to use of traditional medicines. This paper highlights the use and conservation of herbal remedies to manage HIV/AIDS pandemic in Tanzania. Ethnobotanical surveys were carried out in Bukoba Rural District to explore the traditional ethno-medical knowledge, the use and conservation of medicinal plants in the management of HIV/AIDS opportunistic infections and to determine whether levels of harvesting are sustainable. The district is currently an epicenter of HIV/AIDS and although over 90% of the population in the district relies on traditional medicines to manage the disease, this traditional knowledge still remains largely unknown. Seventyfive plant species belonging to 66 genera and 40 families were found to be used to treat one or more HIV/AIDS related diseases in the district. Eight plant species were tested in-vitro for their antifungal activity against three major fungal pathogens, Candida albicans (C.P. Robin) Berkhout, Cryptococcus neoformans (San Felice) Vuill., and Aspergillus niger Tiegh. Three of them were further tested in-vivo for their anti-Candida activity. With decreasing natural stocks of medicinal plants, and based on the results, this study further provides concrete recommendations for the conservation of these important non-timber forest products and the region's medicinal plant biodiversity.