Sulfo-Cyanine7.5 NHS ester

Sulfo-Cyanine7.5 NHS ester is a water-soluble, amine-reactive cyanine dye designed for efficient fluorescent labeling of proteins and other primary-amine containing biomolecules. Its NHS ester chemistry enables straightforward conjugate preparation for fluorescence imaging workflows, while the cyanine7.5 spectral profile supports sensitive red/far-red detection on common fluorescence microscopes and imaging systems.

1. Protein Conjugation Labeling

Sulfo-Cyanine7.5 NHS ester is widely used by bioconjugation and chemical biology laboratories to generate fluorescent protein conjugates for binding studies, localization experiments, and reagent development. Researchers typically label antibodies, antibody fragments, enzymes, and carrier proteins to create imaging reagents that can be tracked in solution or on surfaces. The sulfonated, water-soluble dye format supports labeling in aqueous buffers compatible with downstream assays, enabling conjugates for fluorescence microscopy, gel-based readouts, and plate-based fluorescence measurements where red/far-red emission is advantageous.

2. Antibody and Affinity Reagent Imaging

Sulfo-Cyanine7.5 NHS ester supports construction of fluorescent affinity reagents used in immunofluorescence and target-binding characterization. By labeling primary amines on antibodies or affinity ligands, teams develop imaging probes for flow cytometry sample screening, fluorescence microscopy localization, and qualitative binding comparisons across experimental conditions. The resulting cyanine dye conjugates are commonly used when a far-red emission channel is preferred to reduce spectral overlap with common green fluorophores, supporting multiplex-friendly experimental designs.

3. Biomolecule Tracking In Assays

Sulfo-Cyanine7.5 NHS ester is frequently employed to prepare labeled biomolecules for fluorescence-based bioassays and molecular tracking studies. Conjugates prepared from amine-containing peptides, proteins, and other macromolecules are used to monitor binding, uptake, distribution, or retention in assay formats such as endpoint fluorescence plates and imaging-based readouts. In these workflows, the dye's cyanine7.5 emission region helps separate signal from many background fluorophores, making it useful for developing research-grade fluorescence reagents for screening and method development.

4. Surface and Biomaterial Functionalization

Sulfo-Cyanine7.5 NHS ester is also used in biomaterials research to introduce fluorescent tags onto amine-functionalized surfaces and polymers. Researchers label amine-bearing coatings, hydrogel components, and functionalized nanoparticles to create fluorescently traceable materials for microscopy and imaging-based characterization of surface coverage, distribution, and material behavior. This application is particularly relevant in studies where the fluorescent label must be covalently attached to an amine-containing substrate to support wash-resistant visualization during experimental workflows.