7-Amino-4-methylcoumarin | CAS 26093-31-2

7-Amino-4-methylcoumarin is a coumarin-based fluorescent dye featuring an aniline (amino) substituent that enables straightforward derivatization and incorporation into labeled constructs used in fluorescence-based assays and microscopy workflows. Its coumarin scaffold is widely used as a bright, photostable fluorophore platform for building conjugates, standards, and fluorescence readouts where excitation in the visible range and emission in the blue-to-green region are advantageous. In practice, this dye is selected when researchers need a reactive fluorophore handle for preparing fluorescent conjugates and imaging reagents.

1. Fluorescent Labeling Reagents

7-Amino-4-methylcoumarin is frequently used as a fluorophore building block for preparing fluorescent labeling reagents for proteins, peptides, and other biomolecules in chemical biology and materials research. The amino functionality supports downstream coupling strategies that yield dye-labeled conjugates for tracking biomolecule distribution, monitoring binding events, and generating fluorescent standards for assay development. Researchers often incorporate this coumarin dye into conjugates used in endpoint fluorescence measurements and imaging experiments where a coumarin emission profile provides clear signal separation from background autofluorescence.

2. Fluorescence Microscopy Staining

7-Amino-4-methylcoumarin is applied as a coumarin fluorophore component in microscopy staining workflows, particularly when labeled biomolecules are used as imaging probes for cellular structures or extracellular components. Laboratories commonly prepare dye-conjugated targeting reagents (for example, dye-tagged affinity reagents or dye-labeled polymers) and use them in fluorescence imaging to visualize localization patterns. This dye's small, rigid coumarin core helps maintain strong fluorescence in many labeling contexts, making it a practical choice for constructing microscopy stains and fluorescent tracers used in fixed-sample imaging and imaging reagent development.

3. Fluorescence Bioassay Development

7-Amino-4-methylcoumarin is also used in fluorescence assay development where coumarin-based readouts provide robust endpoint or kinetic signals for monitoring biochemical workflows. Researchers incorporate the dye into assay reagents such as fluorescently labeled substrates, detection tags, or calibration materials to support fluorescence readout in plate-based formats. In these applications, the dye's role is typically to provide a stable fluorescence reporter that can be integrated into custom assay architectures for screening, method optimization, and fluorescence-based quantification.

4. FRET Pair Construction

7-Amino-4-methylcoumarin is commonly used as a donor fluorophore component when building FRET-based systems for fluorescence resonance energy transfer experiments. By using the amino handle to create donor-labeled constructs, researchers can assemble donor-acceptor pairs in labeled biomolecules, polymer systems, or molecular assemblies designed for distance- or proximity-dependent fluorescence changes. This coumarin platform is particularly useful during probe and sensor construction when a visible-excitation donor is needed to pair with an appropriate acceptor dye for ratiometric or signal-suppression readouts.