Description

Fluorescin CAS NO 518-44-5 is a vital organic dye and fluorescent tracer compound, serving as a key intermediate in the synthesis of the widely used fluorescent dye, Fluorescein. Its core value lies in its ability to produce a brilliant, highly visible fluorescence, making it indispensable for detection and visualization applications. This compound is essential for manufacturers and researchers in the biotechnology, diagnostic, and industrial sectors who require reliable, high-purity fluorescent markers.

Application

• Fluorescent Dye Synthesis: Primary precursor in the manufacturing of Fluorescein and its derivatives (e.g., Fluorescein isothiocyanate - FITC).
• Biochemical Staining & Labeling: Used in the preparation of conjugates for antibody labeling, cell tracing, and flow cytometry.
• Diagnostic Reagents: Key component in the formulation of ophthalmic diagnostic strips for detecting corneal injuries and fitting contact lenses.
• Industrial Tracer & Leak Detection: Applied in hydraulic systems and plumbing as a non-toxic, highly visible fluorescent leak detection agent.
• Environmental Monitoring: Utilized as a fluorescent tracer in hydrological studies to track water flow and dispersion.
• Research & Development: Serves as a standard and intermediate in photochemical research and the development of new fluorescent probes.

Basic Information

Product Name	Fluorescin
CAS No.	518-44-5
Molecular Formula	C20H12O5
Molecular Weight	332.31 g/mol
Synonyms	Fluorescein Impurity A; Dihydroxyfluorane; 2-(2,4-Dihydroxybenzoyl)benzoic Acid; 3',6'-Dihydroxyspiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one (dihydro form); Fluorescein Dihydro; Fluorescein Leuco Base; Resorcinolphthalein (reduced); Fluoran White
EINECS	208-253-0

Quality Control

Our Fluorescin is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing, including HPLC, IR, and loss on drying. A Certificate of Analysis (COA) detailing all specifications is provided with each shipment to guarantee compliance with your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Purity (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Related Substances (HPLC)	Individual impurity ≤ 0.5%
Total Impurities	≤ 2.0%

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