Hello! I'd like to have some info about some DS Drop screen printed electrodes (DS 110, 220AT and 550) concerning the way of washing them and the no of cycles each one can be used (in aqueous solutions of monosodium glutamate in concentrations between 1 uM-1mM). I need to make a lot of determinations, including repeats for each test and optimization of CV method and I hope I don't have to throw up about 100 SPEs every day.
Thank you in advance for your response.
Hi, there are few ways to wash them, I guess it might also depend on your aplication. Do you intend to functionalise the surface or not? With regards to cycles they are supposed to be disposable electrodes, so each can be used for one experiment (i.e. 3-4 cycles). We faced that issue as well. I guess you can take a simple redox system in solution and test the electrodes by performing more cycles and see if you get reproducibility in peak to peak separation. This could be a good starting point. You might need to consider if having Ag/AgCl rather than Ag as a reference electrode could be beneficial. They have ceratin electrodes I think that can be used for multiple measurements, but SPEs is normally for one experiment; like polishing a disk electrode after each measurement. Good luck
Hi, they are considered as disposable, but this depends on the species you measure. I have used these electrodes for many measurements if adsorption is not present or they are not used for bioassays.
First you have to check if you need more than washing with a buffer, that I assume that if you are asking is because you need it. You can use chemical / electrochemical activation or a mixed solution, but I think that maybe you have another possibility that could be good, especially when you have many many samples: FIA, flow injection analysis. The flow also cleans the surface, or you can use a specific stream for cleaning from time to time.
Good luck!
This is how we do it -
https://www.zimmerpeacocktech.com/knowledge-base/faq/mechanical-cleaning/
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