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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/7702

Title: PEER REVIEWED ARTICLE No 9 - POTENTIAL TOXICITY OF SOME TRADITIONAL LEAFY VEGETABLES CONSUMED IN NYANG’OMA DIVISION, WESTERN KENYA
Authors: Orech, F. O.
Akenga, T.
Ochora, J.
Friis, H.
Aagaard-Hansen, J.
Keywords: Traditional vegetables, phytochemicals, toxicity, Luo, Nyang'oma
Légumes traditionnels, phytochimiques, toxicité, Luo, Nyang'oma
Issue Date: 31-Dec-2005
Publisher: Rural Outreach Program
Citation: African Journal of Food, Agriculture, Nutrition and Development (ISSN: 1684-5374) Vol 5 Num 1
Abstract: Traditional leafy vegetables are those plants whose leaves or aerial parts have been integrated in a community's culture for use as food over a long span of time. These vegetables are highly recommended due to their relatively high nutritional value compared to the introduced varieties, and are also important in food security. Qualitative phytochemical screening, using standard laboratory procedure, was carried out for alkaloids, saponins, cardenolides, flavonoids and polyphenols on traditional leafy vegetables consumed amongst the Luo, an agro-pastoral community living along the shores of lake Victoria, Western Kenya. The vegetables were: Amaranthus hybridus L. (subsp.hybridus), Asystasia mysorensis T. Anderson, Coccinia grandis (L) Voigt, Crotalaria ochroleuca (Kotschy) Polhill, Cucurbita maxima Duchesne ex Lam, Portulaca quadrifida L., Sesamum calycimum Welw. var. angustifolium (Oliv.) Ihlenf. and Siedenst., Senna occidentalis L. and Sida acuta Burm. F. All the vegetables were found to contain polyphenols and flavanoids while other classes of phytochemicals varied from species to species Brine shrimp lethality tests revealed that S. calycimum var. angustifolium (LC50 84.8 μg/ml), S. occidentalis (LC50 99.5 μg/ml), S. acuta (LC50 99.4 μg/ml), C. grandis (LC50 100.6 μg/ml) and A. mysorensis (LC50 207.7 μg/ml) exhibited marked levels of toxicity. C. ochroleuca (Sunnhemp) contained all the five classes of phytochemicals, but proved less toxic (LC50 4511.3 μg/ml). This vegetable is highly utilized in Nyang'oma, and seventy per cent of the respondents consume this species. A. hybridus (African spinach, or Amaranth) was found to be the least toxic (LC50 6233.6 μg/ml) and this vegetable is recommended for consumption. From the results, five vegetables contain possible agents that can cause acute or chronic toxicities when consumed in large quantities or over a long period of time. Hence some vegetables should be consumed with great care. Though further studies are required to determine which of the phytochemicals are lethal to mammals.
URI: http://hdl.handle.net/1807/7702
Other Identifiers: http://www.bioline.org.br/abstract?id=nd05014
Rights: Copyright 2005 - Rural Outreach Program
Appears in Collections:Bioline International Legacy Collection

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