ATTO 495 NHS-ester

ATTO 495 NHS-ester is an amine-reactive fluorescent labeling reagent designed for covalent attachment to primary amines on proteins, peptides, and other biomolecules. Its ATTO 495 fluorophore provides bright visible emission that is widely used for fluorescence microscopy and fluorescence-based assays, including conjugate tracking and quantitative labeling workflows. The NHS-ester handle enables straightforward preparation of fluorescent conjugates for downstream imaging, detection, and analytical studies.

1. Protein Fluorescent Labeling

ATTO 495 NHS-ester is routinely used by protein engineering and chemical biology groups to generate fluorescently labeled antibodies, enzymes, and protein standards by targeting lysine residues and N-termini. Researchers rely on the covalent attachment to produce stable conjugates for fluorescence microscopy, plate-based fluorescence readouts, and binding/interaction studies where dye leakage or weak adsorption can complicate interpretation. This labeling format is also common in workflow development for fluorescent protein conjugates used in assay calibration, reagent tracing, and comparative studies across protein batches.

2. Antibody and Peptide Conjugates

ATTO 495 NHS-ester supports the preparation of fluorescent antibody conjugates and peptide labeling reagents used in immunoassays, imaging workflows, and biomolecule tracking. Bioconjugation teams often choose NHS-ester chemistry when they need reproducible dye installation on amine-rich targeting ligands, enabling consistent visualization of binding events or localization patterns in experimental systems. In microscopy and fluorescence imaging pipelines, ATTO 495-labeled antibodies and peptides are frequently incorporated as detection reagents, reference probes, or labeling components for multi-step staining strategies.

3. Flow Cytometry Dye Conjugation

ATTO 495 NHS-ester is used to create fluorescently labeled protein reagents for flow cytometry experiments, particularly where covalent dye attachment to cell-binding proteins improves signal consistency during wash steps. Cytometry users commonly install ATTO 495 onto antibodies or other amine-bearing binders to generate stable conjugates for cell-surface staining, binding kinetics experiments, and fluorescence-based phenotyping workflows. The dye's visible emission supports routine cytometer configurations that include the corresponding excitation/detection channels, enabling quantitative comparison of labeled populations across conditions.

4. Fluorescent Bioassay Reagent Development

ATTO 495 NHS-ester is frequently incorporated into the development of fluorescence assay reagents where labeled biomolecules serve as reporters, tracers, or assay components. Assay developers use ATTO 495 conjugates to monitor binding, immobilization, and reaction progress in plate-based formats, as well as to validate assay workflows using fluorescent standards. Covalent NHS-ester labeling helps maintain reagent integrity during incubation and washing steps, supporting robust assay reagent preparation for research and industrial screening environments.