CalFluor 555 Azide | CAS 1798305-99-3

CalFluor 555 Azide is an azide-functionalized fluorescent labeling reagent designed for strain-promoted or copper-free click chemistry workflows that attach CalFluor 555 fluorophores to biomolecules and materials. The azide handle enables efficient conjugation to cyclooctyne/DBCO-modified targets, supporting fluorescent tagging for microscopy and fluorescence-based readouts. Its bright emission in the visible range makes it useful for multicolor imaging and for constructing labeled probes, surfaces, and polymers where robust fluorescent reporting is required.

1. Biomolecule Labeling

CalFluor 555 Azide is used to fluorescently tag proteins, peptides, and other biomolecules in chemical biology and imaging workflows where an azide-bearing dye is required for click-compatible conjugation. Researchers commonly incorporate it into labeling strategies for preparing fluorescent conjugates for microscopy, binding studies, and assay development, leveraging the azide functional group to couple to DBCO- or cyclooctyne-functional biomolecule partners. This approach is particularly useful when the labeling chemistry must proceed under conditions that preserve biomolecular activity and when a defined dye payload is needed for downstream fluorescent readout.

2. Fluorescence Microscopy Staining

CalFluor 555 Azide is applied as a fluorescent staining reagent in microscopy experiments that rely on click-based attachment to cell-associated or surface-present targets. In practice, it is used to generate fluorescently labeled samples by first preparing cyclooctyne/DBCO-functional surfaces, probes, or targeting constructs and then performing the azide click labeling step to install the CalFluor 555 signal. Imaging users benefit from the dye's visible emission for standard fluorescence microscopy channels, enabling visualization of labeled structures, surface localization patterns, and tagged biomolecular assemblies in fixed or prepared sample formats.

3. Biomaterial And Surface Functionalization

CalFluor 555 Azide supports fluorescent surface engineering for biomaterials research, where azide-dye conjugation is used to create trackable materials and imaging-compatible coatings. Materials scientists and assay developers often use it to label hydrogels, polymer scaffolds, and engineered surfaces after introducing click-reactive cyclooctyne/DBCO groups, enabling spatial mapping of material components and monitoring of surface-associated processes by fluorescence imaging. This labeling strategy is also used to prepare fluorescently traceable reagents for workflow validation, sample tracking, and visualization of material-biomolecule interactions.

4. Fluorescent Probe Construction

CalFluor 555 Azide is frequently incorporated into fluorescent probe development pipelines that require modular assembly of dye-bearing conjugates via click chemistry. Probe designers use the azide functionality to couple CalFluor 555 to probe scaffolds, affinity reagents, or multicomponent constructs that already carry DBCO/cyclooctyne handles, producing imaging reagents with a defined fluorophore payload for microscopy and fluorescence readouts. The resulting labeled probes are used in research settings such as localization studies, labeling optimization, and multicolor experimental design where a visible-range fluorophore is needed as part of the detection scheme.