IRDye® 800CW

IRDye® 800CW is a near-infrared (NIR) fluorescent dye designed for robust fluorescence labeling and imaging workflows. As a reactive dye, it is commonly used to generate fluorescent conjugates for optical detection, taking advantage of NIR excitation/emission that reduces background from biological autofluorescence in many imaging formats. In practice, IRDye® 800CW labeling is widely adopted for quantitative fluorescence readouts, conjugate tracking, and molecular imaging reagent development.

1. Western Blot And Blotting

IRDye® 800CW is frequently used in immunoblotting workflows to visualize immobilized proteins with NIR fluorescence detection. Researchers and core facilities label antibodies, secondary reagents, or protein standards with IRDye® 800CW to enable sensitive, multiplex-friendly imaging on fluorescence imaging systems. This application benefits from NIR signal collection, which helps minimize interference from visible-range background and supports quantitative band comparison across experimental conditions.

2. In Vivo Optical Imaging

IRDye® 800CW is applied in small-animal optical imaging studies where NIR fluorescence provides whole-body or regional signal localization for labeled biomolecules. Common use cases include fluorescent tracking of antibody conjugates, peptide conjugates, or other targeting ligands after conjugate preparation in the lab. Teams performing molecular imaging reagent development rely on IRDye® 800CW to generate stable fluorescent conjugates that can be imaged using NIR-capable imaging platforms to monitor distribution patterns over time.

3. Targeting Ligand Conjugates

IRDye® 800CW is used to construct fluorescent targeting conjugates for cell-binding and binding-competition experiments in chemical biology and assay development. Investigators label antibodies, affibodies, nanobodies, peptides, or other affinity reagents with IRDye® 800CW to visualize binding to immobilized targets or cell-associated antigens using fluorescence imaging and plate-based readouts. This dye supports workflows where the fluorescent tag must remain attached to the binding scaffold so that localization and relative binding behavior can be assessed experimentally.

4. Fluorescent Imaging Standards

IRDye® 800CW is also employed as a fluorescence reference material in imaging and assay method development, including calibration and normalization strategies for NIR fluorescence instruments. Laboratories use IRDye® 800CW-based standards or labeled controls to verify instrument performance, compare runs across days, and support quantitative analysis of fluorescence intensity in imaging experiments. This use case is particularly common in research groups that routinely develop and validate fluorescent conjugate assays and imaging protocols.