High Quality Fluorescein 2321-07-5 Purity 98%

• CAS No.: 2321-07-5
• Formula: C20h12o5
• EINECS: 219-031-8
• Classification: Organic Analytical Reagents
• Grade: AR
• Specific Usage: For Biological Purpose, For Microbiological
• Model NO.: IND
• Content: Standard
• Usage: Laboratory Reagents, Analytical Reagents
• Source: Concrete
• Habit Appellation: Fine Chemicals
• Application: Industry, Scientific Research
• Property: Organic Reagent
• Molar Mass: 332.311
• Storage: Store at Room Temperature
• Solubility in Water: Slightly
• Melting Point: 314 to 316deg
• Boiling Point: 662.6deg at 760 Mmhg (Predicted)
• Transport Package: 25 Kgs Fiber Drums
• Specification: IND
• Trademark: Sinochembt
• Origin: Shenyang
• HS Code: 3204120000
• Production Capacity: 1000kgs Per Month

Product Description

Fluorescein appears as yellow amorphous solid or orange-red crystals. Latter have greenish-yellow fluorescence by reflected light. Insoluble in water. Soluble in dilute aqueous bases. Very dilute alkaline solutions exhibit intense, greenish-yellow fluorescence by reflected light. Low toxicity. May be sensitive to prolonged exposure to light.Fluorescein is an organic compound that has wide use as a synthetic coloring agent. It is prepared by heating phthalic anhydride and resorcinol over a zinc catalyst, and it crystallizes as a deep red powder. This agent emits an intense green fluorescence in the presence of alkaline solutions and therefore is used as a label when conjugated to antibodies or as a contrast agent for ophthalmic angiography.Fluorescein (lactone form) is a xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytical chemistry as an indicator in silver nitrate titrations and in microscopy. It has a role as a radioopaque medium and a fluorescent dye. It is a xanthene dye, a gamma-lactone, a polyphenol, an oxaspiro compound, a member of 2-benzofurans and an organic heteropentacyclic compound. It derives from a fluorescein (acid form).

Grade	Indicator
Maximal absorption wavelength λ(PH8.0),nm	490-493
Quality absorption coefficient λ(PH8.0),L/(cm·g)	≥ 200
Solubility in alcohol	Passes test
Sensitivity test	Passes test
Loss on drying %	≤ 5.0
Sulfated ash %	≤0.3