Reactivity of Clays Consummated in Côte d'Ivoire in Digestive Conditions: Bioavailability of Mineral Elements

Vamoussa Coulibaly, N’dri Kouamé, Atolé Brice Kédi, Joseph Sei, Samuel Oyetola


In order to evaluate the impact of clay on the body during digestion, a study of the bioavailability of elements from clay minerals from Anyama and Bingerville (Abidjan district) was performed in vitro. A simulation of the destruction of a solid matrix in the human gastrointestinal tract was undertaken. The analysis of different juices after digestion revealed the presence of numerous inorganic elements essential for biological activity. Green clay of Anyama consisting of chlorite, illite and smectite, released more elements than those of Bingerville, the mineralogy of witch being dominated by kaolinite. The concentration of some ions (Al, Co, Ca, Cu, Fe, Zn, Pb, Si) decreased during the transition from the step of the stomach (pH = 2.5) to that of the small intestine (pH ≈ 7). The proportions of zinc and copper in spite of decrease during the small intestine step, remain superior to the others. To the contrary, an increase was observed for K, Ni and P. Iron and calcium in this series were distinguished by their disappearance during the stage of the small intestine.


clay minerals, trace elements, reactivity, bioavability, geophagy

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