Hexachlorofluorescein (HEX) is a hexachlorinated derivate of the fluorescent dye fluorescein. HEX-labeled oligonucleotides are used in PCR and the HEX channel is widely used in multiplex qPCR. Oligonucleotides with a HEX label can be easily generated using HEX azide and alkyne-containing oligonucleotide via azide-alkyne cycloaddition. HEX exhibits an excitation peak at 535 nm and an emission peak at 555 in green-yellow area, and it can serve as a substitute for JOE, Alexa Fluor™ 532, BODIPY™ 530/550, VIC™ because of the similar spectral characteristics.
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