Lucifer yellow iodoacetamide dipotassium salt | CAS 176182-05-1

Lucifer yellow iodoacetamide dipotassium salt is a reactive fluorescent labeling reagent built on the Lucifer yellow fluorophore and an iodoacetamide electrophile for thiol-selective conjugation. After alkylation of accessible cysteine residues, the resulting fluorescent adduct enables visualization and quantitative readout in biochemical labeling workflows. Its strong aqueous compatibility and bright emission make it a common choice for mapping protein surface labeling and tracking biomolecular transport in fluorescence-based assays.

1. Protein Thiol Labeling

Lucifer yellow iodoacetamide dipotassium salt is frequently used by protein chemistry and chemical biology groups to label cysteine-containing proteins, peptides, and protein fragments for fluorescence imaging and analytical characterization. Researchers employ the reagent to generate fluorescent protein conjugates for downstream experiments such as binding studies, electrophoresis-based tracking, and comparative labeling of engineered cysteine sites. The iodoacetamide functionality supports covalent attachment under typical bioconjugation conditions, allowing stable fluorescence labeling for workflows where noncovalent dyes would be less reliable.

2. Membrane Permeability Tracing

Lucifer yellow iodoacetamide dipotassium salt is used in cellular and biomaterials research to follow transport across membranes and to assess uptake pathways using fluorescence readouts. Investigators introduce the labeled species into experimental systems where diffusion or permeability differences can be monitored by microscopy or plate-based fluorescence measurements. Because the dye is covalently attached to thiol-containing components or retained within labeling contexts, it is often applied to track movement in membrane-associated experiments rather than relying on transient dye partitioning.

3. Fluorescent Conjugate Standards

Lucifer yellow iodoacetamide dipotassium salt is also used in assay development and instrument validation as a fluorescent labeling reference material. Many laboratories prepare consistent fluorescent conjugates or labeled controls to standardize imaging conditions, calibrate fluorescence measurements, and verify labeling consistency across experiments. The dipotassium salt form supports handling in aqueous buffers, which helps researchers maintain reproducible fluorescence behavior when comparing labeled samples across batches, instruments, or experimental days.

4. Biomaterial Surface Labeling

Lucifer yellow iodoacetamide dipotassium salt is applied in biomaterials and surface chemistry workflows to fluorescently tag thiol-functionalized surfaces, coatings, or biomolecule layers. Researchers incorporate the reagent into labeling strategies for hydrogels, polymer films, and immobilized protein assemblies where covalent attachment provides stable fluorescence for localization and coverage assessment. Fluorescence microscopy and quantitative imaging are commonly used to evaluate surface modification uniformity and to monitor how labeled biomolecular layers distribute within engineered materials.