N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5

N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5 is a Cy5-based fluorescent dye conjugated to PEG chains, providing a hydrophilic, sterically protected fluorophore for labeling workflows that benefit from reduced nonspecific interactions. The Cy5 chromophore supports far-red fluorescence readouts commonly used in fluorescence microscopy, flow cytometry, and fluorescence-based assays, while the PEGylated architecture helps maintain labeling performance in aqueous biological buffers and conjugate preparations.

1. Protein And Peptide Labeling

N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5 is used to generate far-red fluorescent protein and peptide conjugates for imaging and quantification experiments in chemical biology and biomaterials research. Researchers typically incorporate the PEGylated Cy5 dye into labeling strategies where water solubility and reduced aggregation are important for consistent fluorescence across buffer conditions. The dye's Cy5 emission is routinely paired with standard far-red filter sets for fluorescence microscopy and plate-based fluorescence measurements, enabling visualization of labeled biomolecules in binding studies, uptake assays, and localization experiments.

2. Antibody And Affinity Reagent Conjugates

N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5 is frequently selected for constructing fluorescent affinity reagents such as antibody conjugates and other targeting binders used in immunofluorescence and flow cytometry workflows. The PEG spacers help improve handling in aqueous staining buffers and can reduce dye-biomolecule crowding effects that otherwise lead to variable brightness or increased background. In practice, the far-red Cy5 signal supports multiplex-friendly panel design when combined with spectrally distinct fluorophores, allowing researchers to track binding, surface association, and relative abundance of target-binding events in cell-based assays and biomarker screening formats.

3. Fluorescent Tracing In Biomaterials

N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5 is applied as a fluorescent tracer for biomaterials and surface-associated systems where stable, water-compatible labeling is required. Scientists use Cy5-PEG dyes to visualize polymer coatings, hydrogel components, and functionalized surfaces during material characterization, diffusion studies, and cell-material interaction experiments under fluorescence microscopy. The hydrophilic PEG architecture supports more uniform staining and helps limit nonspecific adsorption that can complicate interpretation when imaging thin films, porous matrices, or surface-modified substrates.

4. Flow Cytometry Staining Panels

N-methyl-N'-methyl-O-(m-PEG4)-O'-(acid-PEG5)-Cy5 supports flow cytometry workflows that rely on far-red fluorescence to quantify labeled biomolecules or reagent-bound populations. Researchers incorporate the dye into staining and conjugate preparation strategies where aqueous compatibility and reduced dye aggregation contribute to consistent staining intensity across samples. Cy5 emission is commonly detected using far-red channels, enabling researchers to monitor labeled targets while reducing spectral overlap with green and orange fluorophores in multicolor cytometry panels.