BHQ-1 acid | CAS 1190431-95-8

BHQ-1 acid is a fluorescence quencher designed for efficient signal suppression in fluorescence-based assays. As a quencher molecule featuring strong absorption overlap with common fluorophores, it is widely used to control background fluorescence in probe formats where quenching is relieved upon target-dependent proximity or structural change. Its acid form supports conjugation and incorporation into oligonucleotide and biomolecular constructs used in molecular imaging and nucleic acid workflows.

1. Molecular Beacon Quenching

BHQ-1 acid is used in molecular beacon designs where a quencher is paired with a reporter fluorophore on an oligonucleotide hairpin to keep fluorescence low in the unbound state. In nucleic acid hybridization assays, the quencher positioning relative to the fluorophore enables distance-dependent quenching, so fluorescence recovery occurs when the beacon forms a stable duplex with the target sequence. This format is commonly adopted in probe development for sequence-specific detection workflows in research laboratories and assay optimization studies.

2. Real-Time PCR Probe Design

BHQ-1 acid is frequently incorporated into oligonucleotide-based real-time PCR probes to suppress reporter emission when the probe is intact and to generate fluorescence upon target-driven processing. In fluorescence qPCR workflows, the quencher's absorption characteristics help minimize background from the reporter dye, improving the clarity of the time-resolved amplification signal used for nucleic acid analysis. Researchers typically select BHQ-1 acid when building probe sets that require robust quencher performance across standard fluorescent reporter configurations.

3. FRET-Based Oligonucleotide Assays

BHQ-1 acid supports fluorescence resonance energy transfer (FRET) style assay architectures in which a quencher is positioned to reduce donor emission and enable signal modulation upon hybridization or conformational change of nucleic acid constructs. In nucleic acid analysis platforms, this enables design strategies for monitoring strand displacement, duplex formation, or probe architecture transitions using fluorescence readouts. The quencher's role is to provide controllable suppression of donor fluorescence so that target-dependent changes can be tracked in plate-based assays and imaging-compatible detection setups.

4. Fluorescence Suppression Controls

BHQ-1 acid is also used as a quencher component in assay development to generate well-controlled fluorescence suppression backgrounds for method validation and reagent optimization. In fluorescence-based nucleic acid workflows, incorporating a quencher into probe or oligonucleotide control constructs helps establish baseline emission behavior and supports consistent interpretation of signal changes across experimental conditions. This use is common during multiplex assay planning, probe screening, and experimental design where minimizing residual reporter fluorescence is necessary for reliable readout.