ATTO Rho101 NHS ester

ATTO Rho101 NHS ester is an amine-reactive ATTO dye designed for fluorescent labeling of biomolecules and materials via NHS ester coupling to primary amines. Its rhodamine-like emission supports bright fluorescence for imaging and quantitative fluorescence workflows, while the activated ester format enables straightforward conjugate preparation for microscopy, labeling controls, and assay reagent development.

1. Protein And Antibody Labeling

ATTO Rho101 NHS ester is widely used to generate fluorescently labeled proteins, antibodies, and affinity reagents for fluorescence imaging and binding studies. Researchers typically couple the NHS ester to lysine residues on proteins to produce conjugates used in immunofluorescence workflows, fluorescence-based binding assays, and receptor/ligand interaction experiments where consistent labeling is needed across batches. The dye's strong visible emission makes it practical for standard fluorescence microscope filter sets and plate-reader measurements used in biochemical characterization and assay development.

2. Fluorescence Microscopy Staining

ATTO Rho101 NHS ester supports fluorescent staining of fixed biological samples and labeled biomolecular components for cellular and subcellular visualization. In microscopy workflows, conjugates prepared from this reagent are used to track localization of protein targets, visualize labeled extracellular components, or highlight specific biomolecular structures in multi-channel imaging experiments. The activated ester chemistry is particularly useful when preparing custom fluorescent conjugates for microscopy experiments that require defined labeling of amine-containing biomolecules rather than relying on pre-labeled commercial reagents.

3. Flow Cytometry Fluorescent Labeling

ATTO Rho101 NHS ester is commonly used in reagent development for flow cytometry, where fluorescent labeling of amine-bearing biomolecules enables quantitative analysis of binding and cellular association. Conjugates produced from lysine coupling are used for labeling antibodies, protein probes, and other affinity reagents used to stain cell populations in suspension. The dye's bright emission supports clear signal generation for gating and comparative quantification in fluorescence-activated cell sorting workflows that rely on robust dye performance with standard optical detection channels.

4. Fluorescent Bioassay Reagent Preparation

ATTO Rho101 NHS ester is used to prepare fluorescent assay reagents by covalently attaching the dye to proteins or other amine-containing assay components. In fluorescence-based bioassays, labeled reagents can serve as detection partners, labeling standards, or readout components in binding and characterization assays designed for plate readers. The NHS ester format helps streamline conjugate generation for assay development teams that need reproducible dye conjugation to biomolecular reagents prior to screening and method optimization.