BHQ-1 NHS | CAS 916753-61-2

BHQ-1 NHS is a quencher building block designed for fluorescence signal suppression in conjugation workflows, combining a BHQ-1 quencher core with an NHS ester for efficient coupling to primary amines. This reagent is commonly used by fluorescence assay developers and molecular imaging researchers to create quencher-labeled oligonucleotides, peptides, proteins, and antibody conjugates where background reduction and distance-dependent signal control are required. Its NHS reactivity supports straightforward incorporation into labeling strategies that rely on fluorophore-quencher proximity, including FRET-based and oligonucleotide beacon formats.

1. FRET Quencher Conjugates

BHQ-1 NHS is frequently used to prepare fluorophore-quencher pairs for FRET-based assays, where quenching is engineered by controlling the spatial relationship between donor and acceptor components. Researchers use BHQ-1 NHS to introduce the quencher onto proteins, peptides, or engineered binding constructs that are later paired with a compatible fluorescent donor label. In assay development workflows, quencher conjugation with BHQ-1 NHS helps suppress fluorescence from the donor in the absence of the target-dependent event, supporting cleaner readouts in plate-based fluorescence measurements.

2. Oligonucleotide Beacon Labeling

BHQ-1 NHS is well suited for constructing molecular beacon and related nucleic-acid probe architectures that require quencher placement to minimize fluorescence from a tethered fluorophore. Oligonucleotide labeling teams use the NHS ester functionality to attach BHQ-1 to amine-modified oligos or to quencher-bearing linkers that are incorporated into beacon designs. This approach supports signal control in hybridization and conformational switching assays, where fluorescence recovery occurs when the beacon structure changes donor-quencher proximity.

3. Protein And Antibody Quenching

BHQ-1 NHS is used to generate quencher-labeled proteins and antibody conjugates for fluorescence-based binding studies and reagent development where reduced background is important. In chemical biology and biomolecular assay development, the NHS ester enables coupling to lysine-containing biomolecules, including enzymes used as reporters, affinity reagents used in sandwich formats, and detection antibodies used in fluorescence workflows. By installing BHQ-1 at defined conjugation sites, teams can tailor quenched reporter constructs for proximity-controlled fluorescence readouts.

4. Peptide And Linker Payload Control

BHQ-1 NHS is commonly incorporated into peptide and small-molecule linker systems that are later used to build quenched fluorescence probes and multicomponent labeling reagents. Researchers in biomaterials and molecular imaging workflows use the NHS ester to attach BHQ-1 to amine-bearing peptide handles, spacers, or targeting ligands, enabling controlled quenching when paired with a fluorophore elsewhere in the construct. This strategy is particularly useful when a quencher must be positioned to regulate fluorescence output during assembly of larger probe systems or conjugate libraries.