N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt | CAS 77673-49-5

N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt is a styryl pyridinium fluorophore commonly used as a fluorescence labeling and membrane-associated imaging dye in chemical biology and materials research. Its charged, sulfonate-containing structure supports aqueous handling, while the conjugated styryl system provides strong visible-region fluorescence that is often leveraged for tracking dye uptake, localization, and redistribution in complex biological and polymeric environments.

1. Fluorescence Microscopy Imaging

N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt is frequently employed in fluorescence microscopy workflows to visualize dye localization in fixed or prepared biological samples and in membrane-rich model systems. Researchers use it to monitor staining patterns across cell-associated compartments and to compare relative fluorescence distributions under different experimental conditions, such as changes in membrane composition, incubation time, or washing stringency. In microscopy-based studies, the dye's vivid emission and water-compatible sulfonate functionality help support consistent imaging across aqueous staining buffers.

2. Membrane-Associated Tracing Studies

N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt is used as a fluorescent tracer to follow dye association with lipid-containing phases and membrane-like materials. Chemical biology groups and biomaterials researchers apply it to study partitioning and retention in liposomes, supported lipid bilayers, and other membrane-mimetic constructs, where fluorescence readouts provide a practical way to map dye enrichment at interfaces. Because the dye carries a permanent ionic sulfonate, it is often selected when aqueous compatibility and reproducible staining behavior are important for comparative experiments.

3. Fluorescence-Based Bioassay Development

N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt is also incorporated into fluorescence assay development where dye redistribution or intensity changes report on sample-dependent interactions. In assay development settings, it is used as a readout reagent for monitoring fluorescence changes in multiwell formats, including experiments that probe dye-matrix interactions in cell lysates, protein-rich mixtures, or polymeric media. The conjugated styryl fluorophore provides a convenient optical signal for plate-reader measurements, supporting routine screening-style workflows in fluorescence-based research.

4. Polymer And Biomaterial Labeling

N-(4-Sulfopropyl)-4-(4-(dihexylamino)styryl)pyridinium, inner salt is applied for labeling and visualization of polymeric and biomaterial systems where fluorescent contrast is needed to track distribution, coating uniformity, or phase behavior. Materials scientists use it to stain or incorporate into polymer/lipid composites and to assess spatial organization by fluorescence imaging. The dye's ionic sulfonate group is particularly useful in workflows that rely on aqueous processing and washing steps to remove unbound dye while retaining fluorescence in labeled materials.