NBD-butyric acid | CAS 777085-40-2

NBD-butyric acid is a fluorescent NBD (7-nitrobenz-2-oxa-1,3-diazole) labeling reagent that provides a compact, environment-sensitive fluorophore for chemical biology workflows. Its carboxylic acid functionality enables conjugation to biomolecules and surfaces, while the NBD chromophore supports fluorescence readouts commonly used to monitor labeling efficiency, probe localization, and reaction progress in aqueous laboratory settings.

1. Lipid Analog Labeling

NBD-butyric acid is used to generate NBD-functional lipid-like probes and fatty-acid conjugates for fluorescence microscopy and fluorescence-based assays. Researchers incorporate the NBD group into membrane-associated analogs to visualize distribution changes in model membranes, liposomes, and cellular uptake studies, leveraging the NBD signal to track incorporation and relative localization under controlled staining conditions.

2. Protein and Peptide Labeling

NBD-butyric acid is applied in fluorescence labeling of proteins and peptides as part of reagent development for binding studies and labeling verification. In typical workflows, the NBD fluorophore is introduced into biomolecule conjugates to enable direct fluorescence readout of labeling extent and to support downstream characterization by plate reader assays, gel-based fluorescence imaging, or microscopy, depending on the conjugate format.

3. Enzyme Activity and Substrate Monitoring

NBD-butyric acid is frequently used to construct fluorescent substrates or reporter conjugates for monitoring biochemical transformations that alter the NBD environment or release the fluorophore-containing fragment. Chemical biology teams employ NBD-labeled intermediates in kinetic fluorescence assays to follow reaction progress in vitro, using the NBD emission as a convenient signal for time-resolved readouts.

4. Surface and Polymer Functionalization

NBD-butyric acid is used to prepare NBD-functional materials for fluorescence tracking of surface modification and material interactions. Biomaterials and coatings researchers incorporate NBD into polymer backbones or surface layers to visualize coverage, monitor adsorption of biomolecules onto engineered surfaces, and quantify labeling by fluorescence measurements in screening and materials characterization workflows.