Cy5-NHS ester trifluoroacetate salt

Cy5-NHS ester trifluoroacetate salt is a reactive Cy5 fluorophore NHS ester designed for covalent fluorescent labeling of primary amines under standard bioconjugation conditions. Its red/far-red emission profile makes it a common choice for multicolor fluorescence imaging and labeling workflows where spectral separation from green channels is beneficial, and the NHS ester enables straightforward attachment to proteins, peptides, and other amine-containing biomolecules.

1. Protein And Antibody Labeling

Cy5-NHS ester trifluoroacetate salt is widely used by protein chemistry and antibody conjugation teams to generate fluorescently labeled antibodies, antibody fragments, enzymes, and binding proteins for microscopy and fluorescence-based binding studies. The NHS ester reacts with lysine side-chain amines and N-termini, enabling preparation of imaging reagents that retain the biomolecule's targeting functionality while providing a strong Cy5 signal for detection in fluorescence microscopes and plate readers. Researchers often select Cy5-NHS ester trifluoroacetate salt when they need far-red channel compatibility for multiplexing and reduced background from autofluorescence.

2. Peptide to Biomolecule Conjugates

Cy5-NHS ester trifluoroacetate salt is routinely employed to fluorescently tag peptides, small protein domains, and other amine-bearing ligands used in cellular imaging, uptake studies, and ligand-binding assays. In these workflows, the reagent is used to construct fluorescent conjugates for tracking binding and localization in cell-based experiments, as well as for building fluorescent standards or calibration materials for assay development. Because the labeling chemistry targets primary amines, it is also used to prepare Cy5-labeled biomolecules used as components in downstream probe assemblies.

3. Flow Cytometry Fluorescent Labeling

Cy5-NHS ester trifluoroacetate salt supports fluorescence labeling strategies for flow cytometry where far-red detection is used to improve separation from common autofluorescence and overlapping fluorophores. Immunology and cell biology laboratories use Cy5-labeled proteins and antibody conjugates prepared from this NHS ester to quantify binding to cell-surface targets, monitor staining intensity distributions, and enable multicolor panels that include green and orange fluorophores. The covalent NHS labeling approach helps provide stable dye attachment for routine staining and washing steps typical of cytometry workflows.

4. Fluorescent Tracing In Biomaterial Studies

Cy5-NHS ester trifluoroacetate salt is used in biomaterials and surface chemistry research to incorporate fluorescent labels into amine-functionalized polymers, coatings, and scaffold components for tracing and visualization of material distribution. Teams working on hydrogels, polymer conjugates, and functionalized surfaces often rely on NHS-amine coupling to create fluorescently trackable materials that can be imaged by fluorescence microscopy and related optical readouts. This application is especially relevant when the labeled material must be covalently attached to an amine-containing surface chemistry platform for reproducible imaging across experiments.