LD 489 | CAS 62377-37-1

LD 489 is a fluorescent dye designed for sensitive optical labeling in microscopy and fluorescence-based assays, typically used as a bright reporter in conjugates and stained materials. Its dye-like chromophore supports excitation-emission readouts that are leveraged to visualize labeled biomolecules and to track distribution in heterogeneous samples. In practical workflows, LD 489 is commonly incorporated into staining and labeling protocols where robust fluorescence detection is required with compatible filter sets or fluorescence detection optics.

1. Fluorescence Microscopy Staining

LD 489 is frequently used as a fluorescence microscopy stain to visualize labeled targets in fixed-cell and prepared sample formats, supporting qualitative imaging of biomolecular distribution. Researchers incorporate the dye into labeling workflows for microscopy slides, including labeling of proteins, peptides, and other macromolecules that have been functionalized or conjugated with reactive handles compatible with downstream coupling chemistries. Because LD 489 is used as a signal reporter, it is well suited to imaging experiments where the dye's emission is collected with standard fluorescence microscope filter sets and where wash steps are used to remove unbound material.

2. Fluorescence Labeling Conjugates

LD 489 is used in the preparation of fluorescent labeling conjugates for research tools such as fluorescent probes, tagged affinity reagents, and labeled biomolecule standards. In many laboratories, the dye is selected to provide an optical tag that can be tracked during binding, separation, or purification workflows, including fluorescence readouts after conjugate formation and cleanup. This application is especially common in chemical biology and biomaterials research, where fluorescent conjugates are used to monitor labeling yield, assess reagent performance in assay development, and support imaging or quantification of labeled components in complex mixtures.

3. Flow Cytometry Fluorescent Tagging

LD 489 is applied as a flow cytometry dye for fluorescent tagging of biomolecules and labeling reagents used in cell-associated fluorescence measurements. In typical workflows, researchers use LD 489-containing conjugates to generate fluorescent signals that can be detected on flow cytometers equipped with appropriate excitation and emission channels, enabling population-level analysis of labeled samples. The dye's role in this context is to provide a stable fluorescence reporter for gating and comparative quantification across experimental conditions, including labeling reagent optimization and multi-parameter experiments where fluorescence intensity is used as the primary readout.

4. Fluorescence-Based Bioassay Readouts

LD 489 is also used as a fluorescent reporter in fluorescence-based bioassay development, where signal generation depends on the presence of a fluorescently labeled component in the assay mixture. Assay developers incorporate LD 489 into assay reagents to enable plate-based or cuvette-based fluorescence measurements that track binding events, reagent distribution, or labeling-dependent changes in fluorescence intensity. This usage is common in screening and assay optimization workflows, where LD 489 provides a convenient optical readout compatible with standard fluorescence plate readers and benchtop fluorimeters, supporting iterative development of fluorescence assays and labeled reagent performance checks.