ATTO Rho12 NHS ester

ATTO Rho12 NHS ester is an amine-reactive fluorescent dye designed for covalent fluorescent labeling of proteins, peptides, and other primary amine-containing biomolecules. As an NHS ester, it is commonly used to prepare fluorescent conjugates for microscopy and quantitative fluorescence workflows, leveraging the dye's bright orange-red emission for sensitive visualization and traceable reagent tracking.

1. Protein And Antibody Labeling

ATTO Rho12 NHS ester is frequently used by protein engineering and chemical biology groups to generate fluorescently labeled antibodies, antibody fragments, and purified proteins for binding and localization studies. The NHS ester reacts with lysine side-chain primary amines under standard labeling conditions, enabling stable covalent attachment that is well suited for downstream imaging and fluorescence-based readouts. Researchers use the resulting conjugates in immunofluorescence workflows, protein-protein interaction assays, and fluorescence microscopy experiments where robust retention of the dye on the biomolecule is important.

2. Fluorescence Microscopy Staining

ATTO Rho12 NHS ester supports fluorescence microscopy applications where orange-red labeling provides strong contrast for cellular imaging and biomolecular tracking. Lab teams often incorporate the dye into labeling strategies for fixed-cell immunostaining, fluorescently tagged extracellular proteins, and membrane-associated labeling schemes after conjugate preparation. The covalent nature of NHS-ester labeling helps maintain signal during washing steps typical of microscopy sample preparation, making the dye useful for multi-step staining workflows that require consistent fluorescence across imaging sessions.

3. Flow Cytometry Conjugate Preparation

ATTO Rho12 NHS ester is used to prepare fluorescent conjugates for flow cytometry panels, particularly when researchers need stable dye attachment to proteins used as labeling probes. By covalently tagging amine-containing biomolecules, the dye can be incorporated into reagents for cell-surface or intracellular staining workflows after conjugate synthesis. This approach is commonly applied in cell biology and assay development laboratories that require reproducible fluorescence intensity across samples and careful compatibility with multicolor instrument configurations.

4. Fluorescent Biosensor And Assay Reagents

ATTO Rho12 NHS ester is also applied in fluorescence assay development to generate labeled reporter reagents used in binding assays, reagent tracking, and fluorescence-based readouts. Researchers prepare dye-labeled proteins or peptides as components of biosensor constructs, assay standards, and calibration materials where covalent labeling reduces dye loss during incubation and wash steps. The resulting ATTO Rho12 conjugates are frequently used to monitor assay workflows in plate-based formats and to support quantitative fluorescence measurements with orange-red emission channels.