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Published on: June 1, 2012
Direct potentiometric determination of starch using a platinum redox sensor
Nikola Sakač1, Milan Sak-Bosnar, Marija Horvat
1Department of Chemistry, Josip Juraj Strossmayer University of Osijek, F. Kuhača 20, 31000 Osijek, Croatia. nikola.sakac@gmail.com
Abstract:
Here, we describe the development of a platinum redox sensor for the direct potentiometric quantification of starch in solution. The sensor measures the decrease in free triiodide ion after it complexes with starch to form a starch-triiodide complex. This decrease was, therefore, correlated with starch concentration, and the composition and stability of the potassium triiodide solution were optimised. The starch-triiodide complex was characterized potentiometrically at variable starch and triiodide concentrations. We also propose a response mechanism for the platinum redox sensor towards starch and an appropriate theoretical model. The optimised method exhibited satisfactory accuracy and precision and was in good agreement with a standard spectrophotometric method. The sensor was tested over a range of 0.4-9 mg starch, with recoveries ranging from 97.8% to 103.4% and a detection limit of 0.01 mg starch.
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