MQAE (N-(Ethoxycarbonylmethyl)-6-Methoxyquinolinium Bromide)

MQAE is a 6-methoxyquinolinium derivative and is a fluorescent indicator for intracellular Cl^-. This dye detects the ion via diffusion-limited collisional quenching. MQAE has greater sensitivity to Cl^- and a higher fluorescence quantum yield than SPQ; consequently, it is currently the more widely used of the two indicators.

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