TAMRA-PEG4-Alkyne | CAS 1225057-68-0

TAMRA-PEG4-Alkyne is a TAMRA-based fluorescent labeling reagent bearing a PEG4 spacer and a terminal alkyne handle, enabling copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) for click chemistry workflows. The dye's bright, visible red/orange emission is well suited for tracking conjugation, constructing fluorescent probes, and generating labeled biomolecule or material derivatives with reduced steric constraints from the PEG linker.

1. Biomolecule Click Labeling

TAMRA-PEG4-Alkyne is frequently used by chemical biology and bioconjugation groups to introduce a TAMRA fluorophore onto azide-functional biomolecules via CuAAC. Researchers prepare fluorescently labeled proteins, peptides, and other macromolecular constructs by combining this alkyne with azide-bearing partners, then use the resulting conjugates for fluorescence imaging, binding studies, and assay development where a stable, covalent dye attachment is required. The PEG4 spacer helps maintain labeling accessibility and can improve performance in conjugates where the dye needs to be positioned away from the biomolecule surface for consistent fluorescence readout.

2. Fluorescent Probe Construction

TAMRA-PEG4-Alkyne supports fluorescent probe development pipelines that rely on modular assembly of dye-bearing components. In probe construction workflows, teams use the alkyne handle to click TAMRA onto azide-functional scaffolds such as affinity reagents, targeting ligands, or reporter modules, enabling rapid generation of probe libraries for microscopy and fluorescence-based screening. The PEG4 linker is also useful when building multicomponent probes where steric separation between the fluorophore and the recognition element can influence labeling consistency and imaging contrast.

3. Surface And Material Functionalization

TAMRA-PEG4-Alkyne is applied in biomaterials and surface engineering projects to create fluorescently tagged surfaces and polymer coatings through click attachment to azide-functional substrates. Materials scientists and materials chemists incorporate this reagent into workflows that generate labeled hydrogels, polymer films, and nanoparticle surfaces for visualization of coating uniformity, tracking of material interactions, and development of fluorescence readouts for material-based assays. The PEG4 spacer provides a flexible linker that can improve dye exposure at the interface, supporting more reliable surface fluorescence during microscopy and quantitative fluorescence measurements.

4. Tracking Conjugation Efficiency

TAMRA-PEG4-Alkyne is also used as a practical fluorescent reporter for monitoring click-labeling workflows and verifying conjugation outcomes. In many laboratories, researchers include this alkyne in model CuAAC reactions with azide-functional targets to assess labeling yield and compare reaction conditions using fluorescence readouts. Because the TAMRA signal is straightforward to detect on common fluorescence instrumentation, it is often used to support process development for generating fluorescent conjugates for downstream imaging, flow-based analysis, or assay reagent preparation.