FDA (Fluorescein Diacetate)

Fluorescein diacetate (FDA) is a cell-permeant dye that serves as a substrate for esterase enzymes. When introduced to living cells, the nonfluorescent FDA is converted to green-fluorescent fluorescein, indicating cell viability. This makes FDA a vital stain for a variety of applications, including determining microbial activity and staining living cells for microscopy.

CAS: 596-09-8
Mol. Formula: C24H16O7
Mol. Weight: 416.38
Solubility: 50mg/mL in DMSO