| Customization: | Available |
|---|---|
| CAS No.: | 2321-07-5 |
| Formula: | C20h12o5 |
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| Fluorescein Basic information | |
| Product Name: | Fluorescein |
| CAS: | 2321/7/5 |
| MF: | C20H12O5 |
| MW: | 332.31 |
| EINECS: | 219-031-8 |
| Fluorescein Chemical Properties | |
| Melting point | 320 °C(lit.) |
| Boiling point | 429.44°C (rough estimate) |
| density | 1.2739 (rough estimate) |
| refractive index | 1.5000 (estimate) |
| storage temp. | −20°C |
| solubility | Solubility Insoluble in water, ether, benzene, chloroform; soluble in ethanol, methanol, acetone, Iethyl acetate, N,N-dimethylformamide |
| Colour Index | 45350 |
| form | Powder |
| pka | 2.2, 4.4, 6.7(at 25ºC) |
| color | Red to orange |
| PH Range | Pink uorescence (4.0) to green uorescence (6.0) |
| Water Solubility | insoluble |
| λmax | 493.5nm, 496nm, 460nm, 515nm |
| Merck | 144,159 |
| BRN | 94324 |
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).
HUNAN JQMATERIAL Co.,Ltd is reputable supplier specialized in pigments and dyes since 2010. After years of development, the company has an experienced sales and after-sales service team.
Strict quality guarantee system and perfect management system, high-quality products after-sales service is our foothold. Based on "quality first, reputation first" principle , provide customers with qualified colorants food, cosmetic and pharmaceutical industries and organic intermediate for dyes and pharmaceutical industry.
MOQ is 1KG. We have 1kg bag and bottle
5KG bottle and 20L bottleSample usually shipped by Fedex, DHL, UPS.
Bulk order can be shipped by sea, air or by railway.
1. Before shipment, free sample for test
2. Packing as your request, with photo before shipment
3. Cargoes photo before and after loading into container
4. Fast shipment by reputed shipping line
5. Best service after shipment with emails
Q1: Are manufacturer or trading company?
A: We are manufacturer. You are welcome to visit our factory.
Q2: How to contact with us?
A: Click the "Contact Supplier", send us message, you will get reply within 24 hours.
Q3:Which kind of payment terms do you accept?
A: For small order,you can pay by trade assurance.
For bulk order, you can pay to our company's bank account.
Q4:How can I make payment safe?
A: The whole transaction is under (Third party) inspection
Q5:How can I get a sample?
A few sample is free but you need to pay for the shipping cost.we normally send sample by FEDEX, DHL,EMS.
Q6: Is it possible to custom the labels with our own design?
A: Yes, just send us your artworks, you will get what you want
For More Information Send us Inquiry as below Please !!!
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