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Strategy of analysis for the estimation of the bioavailability of zinc in foodstuffs
Authors:G Schwedt  Abu Baker Tawali  Kerstin Koch
Institution:Institute for Inorganic and Analytical Chemistry of the Technical University Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld, Germany, DE
Faculty of Agriculture, Hasanuddin University, Ujung Pandang 90245, Indonesia, ID
Abstract:After the application of simulated digestive fluids (gastric and intestinale fluid) as extraction solutions, AAS and differential pulse anodic-stripping voltammetry (DPASV) were used as analytical methods in combination with ion-exchange procedures for the determination of zinc species and total zinc contents. The ion exchange procedure and the shifting of electrochemical potentials as well as changes of the calibration slope after standard addition in the polarographic analysis allowed discriminating statements with regard to a possible resorption of zinc. On the basis of these methods, a strategy is presented for in vitro investigations of the bioavailability of zinc in foodstuffs.
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