5(6)-TAMRA NHS Ester

5(6)-TAMRA NHS Ester is a reactive TAMRA-based fluorescent labeling reagent designed for efficient coupling to primary amines under standard bioconjugation conditions. As an NHS ester, it is commonly used to prepare fluorescent protein, peptide, and antibody conjugates, as well as labeled biomolecule standards for fluorescence imaging and spectroscopy. TAMRA's visible emission makes it a practical choice for many microscopy and plate-reader workflows where robust red/orange fluorescence readout is required.

1. Protein And Antibody Labeling

5(6)-TAMRA NHS Ester is widely used to generate TAMRA-labeled proteins and antibody conjugates for fluorescence microscopy, immunostaining optimization, and binding studies in chemical biology. Researchers typically couple the NHS ester to lysine residues on antibodies, enzyme proteins, or carrier proteins to produce fluorescent immunoreagents and labeling controls for assay development. Because the dye is installed through amine-reactive chemistry, the resulting conjugates are frequently used to track biomolecule localization, monitor binding workflows, and build fluorescent reference materials for method validation.

2. Peptide and Oligonucleotide Labeling

5(6)-TAMRA NHS Ester supports fluorescent labeling of peptides and other amine-containing biomolecules used in molecular imaging and nucleic-acid analysis workflows. In peptide chemistry and probe development, the NHS ester enables TAMRA installation on terminal or side-chain primary amines, producing fluorescent peptides for uptake studies, binding characterization, and competitive binding assays. For nucleic-acid workflows, the reagent is commonly used when oligonucleotides are equipped with a primary amine handle (for example, via an amino-modifier), enabling TAMRA-tagged oligos for fluorescence-based hybridization readouts and labeling of assay components.

3. Fluorescent Imaging And Microscopy

5(6)-TAMRA NHS Ester is used to prepare fluorescent labeling reagents for cellular and molecular microscopy, including red-channel imaging of labeled biomolecules in fixed samples and imaging assay development. Laboratories often use TAMRA-conjugated targets to visualize binding to extracellular components, track labeled ligands in wash-based workflows, or compare labeling conditions across experimental batches. The dye's visible emission and compatibility with common fluorescence microscope filter sets make it a practical fluorophore for multi-step staining workflows where primary-amine coupling provides straightforward reagent preparation.

4. Flow Cytometry Labeling Reagents

5(6)-TAMRA NHS Ester is frequently employed to create TAMRA-labeled antibodies and protein reagents used in flow cytometry panels that include visible/red fluorophores. By coupling to primary amines on antibodies or other targeting proteins, researchers can generate fluorescent reagents for cell-surface or binding assays where amine-reactive conjugation provides a convenient route to fluorescent conjugates. In instrument workflows, TAMRA-labeled reagents are commonly used for gating controls, labeling optimization, and fluorescence-based quantification of binding signals in cell-associated assays.

5. Fluorescent Standards For Assays

5(6)-TAMRA NHS Ester is also used to prepare fluorescent standards and labeled assay components for fluorescence spectroscopy and plate-reader measurements. In many labs, TAMRA-labeled proteins or other amine-containing reference materials serve as calibration controls for conjugate quantification, imaging normalization, and method development. This use case benefits from the NHS ester's straightforward coupling to primary amines, allowing consistent preparation of fluorescent reference reagents that can be used across experimental runs to support reproducible fluorescence readouts.