Description

3,3'-Bis(4-Sulfobutyl)-5,5'-Diphenyl-9-Ethyloxacarbocyanine Betaine Sodium Salt is a high-purity, water-soluble cyanine dye derivative, valued for its strong near-infrared (NIR) fluorescence and excellent photostability. This compound is engineered for applications requiring precise optical properties and reliable performance in aqueous and biological matrices. It is primarily utilized by researchers and manufacturers in the biotechnology, diagnostics, and advanced materials sectors for labeling, sensing, and imaging.

Application

• Fluorescent Labeling Agent: Used as a covalent or non-covalent tag for biomolecules (proteins, nucleic acids) in assay development and diagnostic kits.
• Biological Imaging & Sensing: Serves as a key component in the development of NIR fluorescent probes for in vitro and in vivo imaging applications.
• Optical Materials: Incorporated into advanced materials for photonic devices, light-harvesting systems, and as a sensitizer in dye-sensitized solar cells (DSSCs).
• Analytical Reagent: Functions as a sensitive detection reagent in fluorescence-based analytical methods, including HPLC and capillary electrophoresis.
• Research & Development: A critical tool in academic and industrial R&D for studying molecular interactions, cell trafficking, and energy transfer processes.

Basic Information

Product Name	3,3'-Bis(4-Sulfobutyl)-5,5'-Diphenyl-9-Ethyloxacarbocyanine Betaine Sodium Salt
CAS No.	35501-76-9
Molecular Formula	C41H45N2O7S2Na
Molecular Weight	764.91 g/mol
Synonyms	Oxacarbocyanine dye, sodium salt; 9-Ethyl-3,3'-bis(4-sulfobutyl)-5,5'-diphenyloxacarbocyanine betaine; Sulfo-cyanine dye; NIR dye 755; Benzoxazolium, 2-[5-[1,3-dihydro-3,3-dimethyl-1-(4-sulfobutyl)-2H-indol-2-ylidene]-1,3-pentadien-1-yl]-3-ethyl-, hydroxide, inner salt, sodium salt (related structure); Cyanine dye sodium salt; Fluorescent probe 755; Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our production of this cyanine dye adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. Each lot is characterized by advanced analytical techniques including HPLC, NMR, and mass spectrometry to confirm identity, purity, and the absence of critical impurities. A comprehensive Certificate of Analysis (COA) detailing purity (typically >95% by HPLC), absorbance/fluorescence profiles, and other critical parameters is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at 15-25°C. This material is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent absorption of atmospheric moisture. For long-term storage, consider desiccants or an inert atmosphere.

Specification

Item	Specification
Appearance	Dark green to blue-black powder
Identification (HPLC/MS)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Absorption Max (λmax)	750 - 760 nm
Emission Max (λem)	770 - 780 nm
Extinction Coefficient (ε)	≥ 180,000 L·mol⁻¹·cm⁻¹
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.