The pKa of 5-carboxy-2,7-dichlorosulfonefluorescein is near 4 and thus the dye is potentially an excellent pH indicator for acidic organelles. &lamba,Ex/&lamba, Em= 509/532nm (pH 9) epsilon = 92,000 Yellow solid soluble in DMSO, DMF or a buffer (pH >6) Store at 4C and protect from light C20H10Cl2O8S MW: 481.26
Source:
Synthetic
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