5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate | CAS 126208-13-7

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate is a rhodamine-based, cell-permeable fluorescent dye precursor designed for fluorescent labeling workflows where robust dye retention after uptake is required. The acetoxymethyl ester masking and acetate counterbalance support convenient handling as an esterified dye, while the carboxyl functionality enables downstream conjugation or attachment to biomolecules and materials after deprotection. Its bright visible fluorescence is widely used in fluorescence microscopy and labeling studies that benefit from rhodamine-class signal intensity.

1. Fluorescence Microscopy Labeling

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate is frequently used as a fluorescent labeling reagent for cellular imaging experiments where intracellular staining and subsequent visualization are needed. Researchers incorporate the dye into microscopy sample preparation to track biomolecular distribution, membrane-associated staining, or general cellular localization using standard fluorescence microscopes equipped for rhodamine-range excitation and emission. The esterified form helps simplify loading in imaging workflows, and the dye's carboxyl handle supports conversion to conjugatable forms for longer-term labeling strategies.

2. Flow Cytometry Dye Tracing

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate supports fluorescence-based cell analysis workflows in flow cytometry, particularly when researchers want robust dye-associated signal in cell populations. The dye is used to label cells for population gating, uptake comparisons across experimental conditions, and fluorescence-based readouts in instrument platforms configured for rhodamine-class channels. In typical assay development pipelines, the dye's retention after ester deprotection helps maintain measurable fluorescence during sample handling and acquisition.

3. Protein And Peptide Conjugation

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate is used in fluorescence labeling of proteins and peptides as part of conjugate construction for imaging reagents and binding studies. The dye's carboxyl functionality is leveraged to generate fluorescent conjugates compatible with common bioconjugation formats, enabling researchers to prepare labeled affinity reagents, fluorescent tracers, or assay components that report on biomolecular localization. This application is common in chemical biology laboratories that require a rhodamine-class fluorophore for bright, visually intuitive fluorescence readouts.

4. Fluorescent Bioassay Reagent Development

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate is employed as a building-block dye for developing fluorescence-based bioassays and labeling reagents used in endpoint or kinetic measurements. Assay developers use the dye to create fluorescently tagged reagents that can be tracked in reaction mixtures, wash steps, or binding formats, supporting readouts that rely on fluorescence intensity changes tied to labeling or probe incorporation. The dye's visible emission facilitates straightforward integration into plate-reader and imaging-based assay formats when rhodamine-range optics are available.

5. Biomaterials Surface Functionalization

5-(6)-Carboxy RhodFluor, acetoxymethyl ester, acetate is used to introduce fluorescent functionality onto biomaterial surfaces for imaging-guided material studies. Materials scientists incorporate the dye into surface functionalization workflows to produce fluorescently traceable coatings, labeled scaffolds, or visualization-ready polymer constructs used in microscopy and materials characterization. The carboxyl-bearing dye design supports strategies where fluorescent tags must remain associated with the material during handling, imaging, and experimental incubation.