6-ethyl-7-hydroxy-4-methylchromen-2-one is a fluorescent dye.

1. Solution preparation
1. Preparation of mother solution: Dissolve 6-ethyl-7-hydroxy-4-methylchromen-2-one in an appropriate solvent, such as PBS or DMSO, usually at a concentration of 1-10 mM.
2. Preparation of working solution: Dilute the mother solution with PBS/DMEM/H2O to a 1-10 μM working solution for later use.
2. Cell staining and imaging:
1. Add cell sample: Add the dissolved dye to the cell culture and incubate for a certain period of time (usually 30 minutes to 2 hours) so that the dye enters the cell and binds to the cell components.
2. Wash and observe under a microscope: After washing away the excess dye with PBS, observe the fluorescence signal of the cell under a fluorescence microscope.
3. Molecular probe experiment:
1. Labeling molecules or probes: React the dye with the target molecule (such as protein, DNA, etc.) for labeling.
2. Fluorescence detection: Detect the fluorescence signal of the target molecule through a fluorescence spectrometer or imaging system to analyze its properties or changes.
IV. Drug screening experiment:
1. Treat cells with drugs: incubate the drugs with cell samples.
2. Add dye: after staining, observe the fluorescence changes of the drugs on cells.

The above information is based on published literature. Experimental procedures should be appropriately modified to meet specific research demands.

DMSO: < 2.04 mg/mL (10 mM, insoluble or slightly soluble)