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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
Food Chemistry
|December 26, 2012
Summary
A new platinum redox sensor directly quantifies starch in solution by measuring triiodide ion complexation. This accurate and precise method offers a reliable alternative for starch concentration determination.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Biochemistry
Background:
- Accurate starch quantification is crucial in various industries.
- Existing methods may have limitations in direct measurement or sensitivity.
- Development of novel sensors can improve analytical efficiency.
Purpose of the Study:
- To develop a direct potentiometric sensor for starch quantification.
- To optimize the sensor's performance using a platinum redox system and potassium triiodide.
- To validate the sensor's accuracy, precision, and reliability against established methods.
Main Methods:
- Development of a platinum redox sensor.
- Potentiometric measurement of free triiodide ion concentration.
- Optimization of potassium triiodide solution composition and stability.
- Characterization of the starch-triiodide complex.
- Correlation of triiodide decrease with starch concentration.
Main Results:
- The sensor directly quantifies starch by measuring the decrease in free triiodide ions.
- Optimized sensor demonstrated good accuracy (97.8%-103.4% recovery) and precision.
- A detection limit of 0.01 mg starch was achieved.
- Results showed good agreement with a standard spectrophotometric method.
Conclusions:
- A novel platinum redox sensor provides a direct and reliable method for starch quantification.
- The developed sensor offers high accuracy, precision, and sensitivity.
- This potentiometric approach is a viable alternative to traditional starch analysis techniques.
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