This research establishes the experimental and theoretical foundation for the development of potentiometric ion sensors with detection limits in the micromolar to picomolar range. The flux of analyte ions from the membrane into the sample which ordinarily perturbs the sample locally at the sensing surface will be minimized by chemical means. Relevant zero-current ion fluxes within plasticized polymeric membranes will be monitored with fluorescence imaging techniques and correlated to appropriate potential drift experiments. Detailed ion flux diffusion models will be developed and correlated to experimental findings. Diffusion coefficients within the membrane phase will be systematically altered with new polyurethane materials with immobilized ionophoric components in view of low detection limit sensing applications. Such polymers will be also used to devise multi-layered membrane phases, which will be applied to generate robust ion gradients within the membrane. Miniature, micrometer sized optical sensor based on the same ionophoric membrane components will be optimized for low detection limit applications and their performance critically compared to their potentiometric counterparts.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Research Project (R01)
Project #
8R01EB002189-04
Application #
6725983
Study Section
Special Emphasis Panel (ZRG1-BMT (01))
Program Officer
Peng, Grace
Project Start
2000-09-25
Project End
2005-08-31
Budget Start
2003-09-01
Budget End
2005-08-31
Support Year
4
Fiscal Year
2003
Total Cost
$157,655
Indirect Cost
Name
Auburn University at Auburn
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
066470972
City
Auburn University
State
AL
Country
United States
Zip Code
36849
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