ATTO 700 NHS ester

ATTO 700 NHS ester is an amine-reactive fluorescent dye designed for covalent fluorescent labeling of proteins, peptides, and other primary-amine containing biomolecules. As an ATTO 700 dye derivative, it is commonly used in far-red fluorescence workflows where robust brightness and compatibility with standard fluorescence instrumentation are required. The N-hydroxysuccinimide (NHS) ester enables efficient conjugation under typical bioconjugation labeling conditions, making it a practical reagent for preparing fluorescent conjugates for imaging and quantitative assays.

1. Protein And Antibody Labeling

ATTO 700 NHS ester is widely used to generate far-red fluorescent protein conjugates for microscopy and fluorescence-based bioassays. Researchers typically label purified proteins, antibodies, antibody fragments, and affinity reagents to create fluorescent detection tools for binding studies, reagent tracking, and assay development. Because the NHS ester reacts with accessible lysine residues and N-termini, the dye is commonly incorporated into antibodies and protein probes while preserving overall biomolecular functionality for downstream experiments. These ATTO 700-labeled bioconjugates are frequently used in fluorescence imaging platforms and plate-based readouts where far-red emission helps reduce background from common autofluorescent components.

2. Fluorescence Microscopy Tracing

ATTO 700 NHS ester supports cellular and biomaterial labeling workflows where far-red fluorescence is advantageous for visualization and multiplexing. In microscopy applications, labeled proteins and peptides prepared with this dye are used as fluorescent tracers to monitor binding to surfaces, uptake or localization patterns, and distribution within complex samples. Imaging teams often choose ATTO 700 labeling when they need a strong emission signal in the red/far-red spectral region to improve contrast against cellular background and to enable co-imaging with other fluorophores. The covalent labeling approach also helps maintain signal stability during washing steps typical of fixed-sample staining and microscopy sample preparation.

3. Flow Cytometry Conjugates

ATTO 700 NHS ester is commonly employed to prepare fluorescent conjugates for flow cytometry staining panels, especially when far-red channels are used to separate signals from autofluorescence and other fluorophores. By covalently labeling amine-containing targeting proteins, researchers can create consistent fluorescent reagents for cell-surface or extracellular labeling strategies in assay development and analytical workflows. The dye's NHS ester chemistry is particularly useful when fluorescent conjugates must be generated reproducibly for quantitative comparisons across samples. In flow cytometry, ATTO 700-labeled reagents are frequently integrated into multicolor experiments to expand spectral coverage while maintaining a robust far-red readout.

4. Fluorescent Bioassay Reagents

ATTO 700 NHS ester is used to construct fluorescent readout reagents for biochemical and binding assays where covalent labeling of assay components is preferred. Many assay developers label proteins used as detection reagents, standards, or reporter conjugates so that binding or interaction events can be quantified by fluorescence intensity. The dye's far-red emission is often leveraged to improve measurement robustness in complex assay matrices that contain fluorescent contaminants or high background. This labeling approach is also used to prepare fluorescent controls and calibration reagents for assay normalization in plate-based formats, including endpoint fluorescence measurements and fluorescence-based kinetic monitoring when compatible with the assay design.