acta satech Journal of the Life & Physical Sciences Babcock

Mineral elements and toxicants in segments of Manihot esculenta grown in Bayelsa State.
Chinyelu Helen Madukosiri, and *Amos-Tautua Bamidele Martin
Department of Chemical Sciences,Niger Delta University, Wilberforce Island Bayelsa State, Nigeria
2010

ABSTRACT
The mineral elements, magnesium (Mg), calcium (Ca), iron (Fe), and the toxicants lead (Pb), cadmium (Cd), and hydrogen cyanide (HCN) content in the peels, raw pulp unfermented pulp of six varieties of Manihot esculenta (cassava) grown and consumed in Bayelsa State were determined. The six varieties were identified as old cultivars traditionally named Accra, Agric (sweet and bitter varieties), Janet, Oguru, Rowaina and Yomugha. Atomic absorption spectroscopic technique was used for the determination of cations; while alkaline picrate method was used for the spectrophotometric determination of hydrocyanide content. The highest mineral contents determined were Mg 0.860.10, Ca 32.482.2 and Fe 3.510.007 (ppm) in the fermented pulp of Janet, inner peels of agric (sweet variety) and outer peels of Rowaina respectively. The compositions of toxicants in the outer peels were 1.470.09 ppm for Pb (inYomugha) and 0.870.24 and 3.510.1 (ppm) for Cd and CN, in that order (in agric bitter variety). Processing by fermentation achieved between 6.98% and 45% reduction in the cyanide content; however it appeared to drastically reduce some mineral content of the fermented product.
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