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Frequently asked questions

Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.

Which dyes are available for use with the IDT ZEN quencher?

Currently, the IDT ZEN™ quencher is available with FAM, HEX, TET, Yakima Yellow® (ELITech Group), JOE™ (ThermoFisher), MAX™, and SUN™ fluorophores. Double-quenched probes have significantly lower background fluorescence, especially for longer probes.

The ZEN quencher is available on PrimeTime™ qPCR Probes and on the probes supplied with PrimeTime qPCR Probe Assays. For any special oligonucleotide requests that include the ZEN quencher but are not found on our website (non-catalog requests), please contact

For more information, see Double-quenched probes increase qPCR sensitivity and precision

ZEN, SUN, MAX, and PrimeTime are trademarks of IDT.