An active transport mimetic system based on thioctic acid as carrier for alkaline earth metal ions |
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Authors: | R Zugle J Kambo-Dorsa V P Y Gadzepco |
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Institution: | 1. Department of chemistry, University of Cape Coast, Cape Coast, Ghana 2. Central University College, Accra, Ghana
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Abstract: | Liquid membranes incorporating thioctic acid as a carrier to mimic an active transport system for alkaline earth metals has been described. A transport cell, operating on the same principle as the Schulman Bridge was used. It has been demonstrated that such a system is capable of transporting alkaline earth metals against a proton gradient, as driving force. The potential of thioctic acid to complex and transport these metal ions particularly Mg2+, Ca2+, and Ba2+ was verified. Furthermore, this transport phenomenon was extended to some different barium salts (Cl?, Br? NO3 ?, and SCN?) to determine the effect of nature of anion on the transport of the Ba2+ ions. The order of the transport rate was found to be Ba2+ > Ca2+ > Mg2+ which is inconsistent with the stability of coordination to the carboxyl group. The rate of transport of Ba2+ ions were found to decrease with the anion type in the order SCN? > Br? > NO3 ? > Cl? which is related to the extent of hydration of the anions. |
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