AF488 azide | CAS 1679326-36-3

AF488 azide is a fluorescent azide building block designed for copper-free and/or copper-mediated azide-alkyne click labeling workflows, enabling direct incorporation of an Alexa Fluor 488-like green emission into biomolecules and materials. Its azide functionality supports efficient conjugation to alkyne-bearing targets, while the bright, visible excitation/emission profile makes it a common choice for fluorescence microscopy and flow cytometry labeling strategies where robust green-channel detection is required.

1. Biomolecule Click Labeling

AF488 azide is widely used by chemical biology and proteomics groups to introduce a green fluorescent tag onto alkyne-functionalized biomolecules, including peptides, proteins, and affinity reagents. In labeling workflows, researchers typically prepare an alkyne handle on the target (for example via functionalization of lysines, engineered tags, or click-ready linkers) and then use AF488 azide to generate fluorescent conjugates for imaging and quantitative fluorescence readouts. This approach is especially valuable when the labeling needs to be modular, allowing the same alkyne-bearing scaffold to be paired with different azide fluorophores for experimental series and multicolor panel development.

2. Fluorescence Microscopy Tracing

AF488 azide supports fluorescence microscopy studies requiring green-channel visualization of click-labeled biomaterials, cells, or extracellular components. Researchers use it to trace fluorescently tagged ligands, surface-associated constructs, or polymeric assemblies that have been engineered with alkyne groups, enabling spatial localization in fixed-sample imaging workflows and in microscopy platforms that detect around the FITC/Alexa Fluor 488 spectral region. The azide handle also facilitates standardized probe construction, helping labs build reproducible labeling reagents for colocalization experiments and time-course imaging where consistent fluorescence reporting is important.

3. Flow Cytometry Panel Labeling

AF488 azide is commonly employed in flow cytometry workflows to generate fluorescently labeled biomolecules for cell-surface or extracellular staining formats based on click chemistry. By pairing AF488 azide with alkyne-functionalized antibodies, ligands, or other targeting reagents, researchers can create stable fluorescent conjugates that report binding or association events with cells using the green fluorescence detector. This labeling strategy is frequently used in assay development for multicolor experiments, where a reliable green fluorophore channel is needed and click-based modularity helps streamline reagent preparation across experimental batches.

4. Fluorescent Conjugate Standards

AF488 azide is also used as a practical fluorescent reagent for constructing defined fluorescent standards and calibration materials in fluorescence-based assays. Laboratories preparing reference conjugates for instrument setup, imaging normalization, or assay qualification often rely on click-ready fluorophore incorporation to build consistent labeled constructs with a known fluorescent reporter. The azide functionality enables straightforward coupling to alkyne-bearing reference scaffolds, supporting routine quality control and method development for fluorescence readouts in research settings.