TR-X-NHS ester, 5-isomer | CAS 178623-11-5

TR-X-NHS ester, 5-isomer is an NHS ester-activated labeling reagent designed for efficient covalent conjugation to primary amines on proteins, peptides, and other amine-containing biomolecules. In fluorescence and chemical biology workflows, this electrophilic ester enables straightforward preparation of fluorescent conjugates and labeled affinity reagents that can be used in imaging, binding studies, and assay development. The "5-isomer" designation reflects a specific structural isomer that may be selected to match established labeling performance in your lab's reagent set.

1. Protein Fluorescent Labeling

TR-X-NHS ester, 5-isomer is commonly used by researchers to generate fluorescently labeled proteins and protein conjugates for microscopy and fluorescence-based binding studies. By targeting lysine residues and N-termini, it supports preparation of imaging reagents for tracking protein localization in fixed-cell workflows, monitoring protein interactions in solution, and constructing labeled standards for fluorescence assays. Conjugates prepared with this NHS ester are frequently used in workflows where stable covalent attachment is preferred over noncovalent dye association, such as when washing steps or extended incubation are required.

2. Antibody And Affinity Reagent Conjugation

TR-X-NHS ester, 5-isomer is also used to prepare labeled antibodies and affinity ligands for immunoassays and fluorescence detection formats. Chemical conjugation to amine groups enables generation of dye-tagged antibodies used in protein detection assays, flow cytometry staining panels, and fluorescence microscopy workflows where consistent labeling is needed across experiments. In chemical biology and diagnostic-reagent development settings, this reagent is valued for enabling rapid build-out of labeled affinity reagents that can be paired with established excitation/emission instrumentation and readout pipelines.

3. Peptide And Biomolecule Tagging

TR-X-NHS ester, 5-isomer supports labeling of peptides and other amine-containing biomolecules used as probes, tracers, and components in molecular imaging reagent development. Researchers typically employ it to attach the dye to peptide scaffolds for fluorescence tracking in biochemical assays, to create labeled peptide controls for binding experiments, or to generate fluorescent conjugates for studying biomolecular transport and uptake in controlled experimental systems. Because NHS esters react under typical bioconjugation conditions with primary amines, the reagent is frequently incorporated into workflows that require covalent dye installation on custom peptide constructs.

4. Surface Coating And Biomaterial Functionalization

TR-X-NHS ester, 5-isomer is used in materials science and biomaterials research to functionalize amine-bearing surfaces and scaffolds with fluorescent tags. Laboratories apply it to create labeled coatings on polymers, beads, and other amine-functional substrates to enable fluorescence readout of surface interactions, immobilized biomolecule performance, and material-based assay development. This approach is particularly useful when the goal is to generate a stable fluorescent surface for imaging, quantification of binding to the material, or development of fluorescence-compatible biomaterial platforms.