Cyanine3B amine

Cyanine3B amine is a reactive cyanine dye designed for fluorescent labeling workflows where amine-reactive conjugation is needed to attach the fluorophore to biomolecules and materials. As a bright, visible-range dye, it is frequently used as a red/orange fluorescence tag in microscopy and fluorescence-based assays, with the amine functionality enabling downstream coupling strategies for generating fluorescent conjugates.

1. Protein And Peptide Labeling

Cyanine3B amine is used by protein chemistry and chemical biology groups to prepare fluorescently labeled antibodies, enzymes, and peptides for binding studies, localization experiments, and fluorescence readouts in assay development. In typical workflows, the dye is incorporated into conjugates that are then tracked by fluorescence microscopy or plate-based fluorescence measurements, enabling researchers to follow conjugate distribution, binding behavior, and sample-to-sample consistency. The cyanine dye's strong visible emission makes it a practical choice for multiplexing with other fluorophores when compatible filter sets are available.

2. Oligonucleotide Conjugation

Cyanine3B amine supports fluorescent labeling of nucleic-acid reagents used in nucleic-acid analysis and fluorescence-based hybridization assays, where red/orange emission is advantageous for separating signal from other channels. Researchers commonly use Cyanine3B amine-derived conjugates to build fluorescent oligonucleotide probes for imaging-based detection workflows and to generate labeled primers or probe strands for monitoring hybridization events. This labeling approach is also used in method development for nucleic acid workflows where consistent dye incorporation into oligonucleotide conjugates is required.

3. Fluorescence Microscopy Staining

Cyanine3B amine is applied in cellular and materials imaging workflows to generate fluorescent labeling reagents for fixed-cell staining, surface labeling, and tagged biomolecule visualization under standard fluorescence microscopes. Lab teams use Cyanine3B amine to produce conjugates that localize to targets such as labeled binding partners, surface-associated biomolecules, or engineered material interfaces, supporting qualitative visualization of spatial distribution. Its emission in the visible range makes it compatible with common microscope filter sets used for multi-color imaging panels.

4. Flow Cytometry Dye Conjugates

Cyanine3B amine is used to prepare fluorescent conjugates for flow cytometry panels where a cyanine-based red/orange channel is required to distinguish labeled populations. Researchers incorporate Cyanine3B amine into labeling reagents that bind to cell-associated targets or report on reagent binding, enabling quantitative analysis of fluorescence intensity across cell populations. This application is particularly common in assay optimization and reagent screening workflows that rely on robust fluorescent tagging and straightforward instrument readout for multi-parameter measurements.