What are the fluorescence excitation/emission maxima for the SYTO 9 dye and propidium iodide in the LIVE/DEAD FungaLight Yeast Viability Kit, for flow cytometry?
How do I prepare dead cell controls for LIVE/DEAD cell viability assays?
There are two easy options. One is to heat-inactivate the cells by placing at 60 degrees C for 20 minutes. The second is to subject the cells to 70% ethanol. Alcohol-fixed cells can be stored indefinitely in the freezer until use, potentially up to several years.
Centrifuge cells, pellet, and remove supernatant.
Fix cells: Add 10 mL ice cold 70% ETOH to a 15 mL tube containing the cell pellet, adding dropwise at first while vortexing, mix well.
Store in freezer until use.
When ready to use, wash twice and resuspend in buffer of choice.