1-Pyrenebutyric acid N-hydroxysuccinimide ester | CAS 114932-60-4

1-Pyrenebutyric acid N-hydroxysuccinimide ester is a reactive NHS ester of a pyrene-containing carboxylic acid, widely used to install a hydrophobic, fluorescence-active pyrene tag onto amine-bearing biomolecules and polymers. The pyrene group supports strong fluorescence for labeling and tracking, while the NHS ester enables efficient covalent coupling to primary amines under standard bioconjugation conditions. This combination makes it a practical reagent for preparing fluorescent conjugates used in microscopy, spectroscopy, and materials characterization.

1. Biomolecule Fluorescent Labeling

1-Pyrenebutyric acid N-hydroxysuccinimide ester is used to fluorescently label proteins, peptides, and other amine-containing biomolecules for downstream imaging and binding studies. Researchers commonly employ it in labeling workflows where a stable, covalent attachment is required to track biomolecule localization, distribution, or interactions in heterogeneous samples such as cell lysates, extracellular matrices, and polymeric biomaterials. The pyrene tag provides an intrinsic fluorescence handle that can be monitored by fluorescence microscopy or fluorescence spectroscopy after conjugate preparation.

2. Polymer And Surface Functionalization

1-Pyrenebutyric acid N-hydroxysuccinimide ester supports incorporation of fluorescent moieties into amine-functional polymers and coatings, enabling fluorescent surface tracking and material characterization. In biomaterials and materials science labs, it is frequently used to functionalize amine-bearing surfaces to create fluorescent reference layers for coating uniformity checks, diffusion/adsorption studies, and surface association experiments. The covalent NHS-ester chemistry helps ensure the pyrene label remains attached during washing steps typical of staining and materials workflows.

3. Fluorescent Probe Construction

1-Pyrenebutyric acid N-hydroxysuccinimide ester is a building-block reagent for constructing fluorescence-based probes and conjugated reporters that rely on a pyrene fluorophore. Chemical biology teams use it to prepare labeled conjugates that can be integrated into larger probe formats, including multicomponent labeling reagents for monitoring binding events or tracking probe uptake in microscopy experiments. Because the coupling targets primary amines, it is particularly useful for generating pyrene-functional conjugates from antibody fragments, affinity ligands, enzyme conjugates, and other amine-rich targeting components.

4. Fluorescence Quenching Studies

1-Pyrenebutyric acid N-hydroxysuccinimide ester is also used in experiments where pyrene fluorescence serves as a reporter in proximity-dependent signal modulation studies. In fluorescence chemistry workflows, pyrene-labeled biomolecules or polymers prepared with this NHS ester are used to evaluate how nearby acceptors, quencher-bearing materials, or interacting partners influence emission intensity. This approach is commonly applied in mechanistic fluorescence readouts and in the development of fluorescence-based assay components where covalent pyrene labeling provides a consistent reporter for comparative measurements.