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An improved method for constructing and selectively silanizing double-barreled, neutral liquid-carrier, ion-selective
Jason S T Deveau1, Michael I Lindinger, Bernard Grodzinski
1Department of Plant Agriculture, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
Biological Procedures Online
|September 2, 2005
Summary
This study presents a new, efficient method for silanizing ion-selective microelectrodes using a manifold. This technique improves reproducibility and stability for in situ measurements in plant tissues.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Plant Physiology
Background:
- Ion-selective microelectrodes (ISMEs) are crucial for in situ measurements.
- Vapour-phase silanization is a key step for preparing ISMEs with liquid ion-exchangers.
- Existing methods can be complex, time-consuming, and lack reproducibility.
Purpose of the Study:
- To develop an improved, efficient, and reliable vapour-phase silanization method for multi-barreled ISMEs.
- To enhance reproducibility and simplify the silanization process.
- To demonstrate the efficacy of the silanized electrodes in plant tissues.
Main Methods:
- A novel technique using a metal manifold for simultaneous, selective delivery of dimethyldichlorosilane to ion-selective barrels.
- Utilized standard borosilicate glass tubing instead of theta-type glass.
- Tested electrodes containing a proton ionophore in pea and sunflower leaf apoplasm.
Main Results:
- The new method requires fewer steps and less handling of individual microelectrodes.
- Achieved improved reproducibility in silanizing selected microelectrode barrels.
- Silanized electrodes demonstrated stability for up to 3 weeks.
- Successfully performed in situ measurements in plant leaf apoplasm with stable readings after multiple impalements.
Conclusions:
- The described manifold-based silanization technique offers a more efficient and reproducible approach for preparing ISMEs.
- This method simplifies electrode preparation and enhances their stability for physiological measurements.
- The technique is effective for in situ studies of ion dynamics in plant tissues.