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Is PI fixable in flow citometry? - (Jan/30/2014 )



After staining cells with propidium iodide (viablility), can we fix the cells with PFA for analysis later on?





I learned the time between PI addition and measurement should be relatively short, so I doubt storing the samples by fixing would be a good this thread here there is someone who apparently tried, though:


The PI will be washed out with more and more washes/buffer changes, but it is certainly possible to PI stain, collect the samples again (if you have the right sort of FACS machine) and then subsequently fix and probe.


Note- I don't do FACS so not sure if this would be true - if you did PI staining and then fixed the cells, you should be able to still do live/dead immediately after fixing, as only the dead cells prior to fixing should have taken up the PI.