Rhodamine 640 Perchlorate | CAS 72102-91-1

Rhodamine 640 Perchlorate is a far-red rhodamine fluorophore designed for bright fluorescence labeling in bioconjugation and imaging workflows. Its cationic, dye-like structure supports strong optical performance in fluorescence microscopy and spectroscopy, while the perchlorate counterion helps maintain the dye's ionic form for convenient handling in aqueous staining and labeling buffers. In practice, Rhodamine 640 Perchlorate is used as a reference and labeling dye for constructing fluorescent conjugates, tracking biomolecules, and building far-red fluorescence readouts for microscopy and assay development.

1. Fluorescence Labeling Conjugates

Rhodamine 640 Perchlorate is frequently used as a far-red labeling dye for preparing fluorescent conjugates used in chemical biology and biomaterials research. Researchers incorporate the dye into labeled proteins, peptides, and other biomolecule carriers to enable visualization and quantitative fluorescence readout in imaging and spectroscopy workflows. The far-red emission region is particularly useful when background autofluorescence is a concern, supporting cleaner signal collection in complex biological samples such as cell lysates, extracellular matrices, and labeled polymer constructs.

2. Fluorescence Microscopy Staining

Rhodamine 640 Perchlorate supports fluorescence microscopy workflows where far-red channels are preferred for multicolor experiments and for imaging samples with significant endogenous fluorescence. Common use cases include labeling of fixed biological preparations, fluorescent tracking of biomolecule distribution in microscopy studies, and staining of labeled materials used in cell culture and biomaterials characterization. Its rhodamine dye behavior makes it a practical choice for generating robust fluorescent contrast in widefield and confocal imaging systems that accommodate far-red excitation/emission detection.

3. Flow Cytometry Fluorescent Tagging

Rhodamine 640 Perchlorate is used in flow cytometry dye development and fluorescent tagging experiments where a far-red fluorophore channel is advantageous for separating labeled populations from background. Investigators employ rhodamine-based fluorescence labeling to track tagged biomolecules on surfaces, quantify fluorescence associated with labeled reagents, and support multicolor panel construction in cell and particle analysis. In these workflows, the dye's bright far-red emission helps maintain detectability when samples contain autofluorescent components or when spectral overlap must be managed across multiple fluorophores.

4. Fluorescent Bioassay Development

Rhodamine 640 Perchlorate is also applied in fluorescence-based bioassay development as a labeling component for assay reagents and fluorescent reporters. Researchers use rhodamine labeling to generate fluorescent substrates, tagged binding reagents, or traceable assay components that can be monitored by plate readers and fluorescence spectrometers. This dye is particularly relevant in assay formats that benefit from far-red detection, including workflows where minimizing interference from shorter-wavelength fluorophores improves overall assay robustness for research-grade screening and characterization studies.