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Study on Ca2+ diffusion through caffeine-containing xantana membranes using a potentiometric microsensor

Grant number: 20/01612-3
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2020
Effective date (End): August 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal Investigator:Mauro Bertotti
Grantee:Paula Calli Falcoswki
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications, AP.TEM


Polysaccharide membranes (xanthan and alginate) can be used for neuronal cell proliferation and differentiation. Such processes are most efficient when experiments are performed with membranes containing magnetic nanoparticles, and one possible explanation involves increasing the flow of Ca2+ ions through specific channels. Accordingly, the project has two main challenges. One of them is related to the fabrication of potentiometric microsensors for the detection of Ca2+, in experiments that will be performed in a cell with two compartments separated by the membranes under study. The experiments will be performed by using Scanning Electrochemical Microscopy (SECM) and the positioning of the potentiometric microsensor just above the membrane surface will be performed by using a Au or Pt microelectrode placed together with the Ca2+ sensor. The other goal of the research project is related to studies with caffeine-containing membranes. Due to a possible interaction of caffeine with Ca2+, caffeine may have some influence on the transport of the metallic cation through the membranes. (AU)

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