Direct Red 81
Direct Red 81 (CAS: 2610-11-9), a disodium salt with the molecular formula C29H19N5Na2O8S2, is a synthetic dye. It exhibits characteristic absorption maxima at 397 nm and 508 nm. This compound is primarily utilised as a biological stain, particularly in cell biology, haematology, and histology for the visualisation of cellular structures and tissues. Its reliable performance makes it a staple in research and diagnostic laboratories.
- IUPAC
- DR 81,Disodium 7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate
Biological Staining
Direct Red 81 is widely employed as a dye in biological and histological staining techniques. It is effective for visualising cellular components and tissue structures in various biological samples, aiding in microscopic analysis.
Cell Biology Research
In cell biology, this stain assists in differentiating and identifying specific cellular elements, supporting research into cell morphology and function. Its spectral properties are useful in certain microscopic imaging applications.
Histology and Hematology
The dye finds application in the fields of histology and hematology for the staining of tissue sections and blood smears, respectively. It helps in the examination of tissue architecture and blood cell morphology.
| Molecular weight | 675.60 |
|---|---|
| Empirical formula | C29H19N5Na2O8S2 |
| Melting point | 240 °C (dec.)(lit.) |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Colour Index Number | 28160 |
|---|---|
| Absorption | λmax 397 nmλmax 508 nm (2nd) |
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Direct Red 81 used for?
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Direct Red 81 is used as a biological stain in cell biology, hematology, and histology for the visualisation of cellular structures and tissues.
What is the CAS number and molecular formula for Direct Red 81?
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The CAS number for Direct Red 81 is 2610-11-9, and its molecular formula is C29H19N5Na2O8S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Direct Red 81 as a technical/research grade product. We do not represent this product as USP, BP, or EP grade.
What are the safety considerations when handling Direct Red 81?
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Handling Direct Red 81 requires appropriate personal protective equipment, including eyeshields, gloves, and a type N95 (US) or type P1 (EN143) respirator filter. Refer to the safety data sheet for comprehensive handling information. The WGK Germany classification is 3.
How is Direct Red 81 packaged and shipped?
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Direct Red 81 is carefully packaged to ensure stability during transport and is exported globally by Tech Serve Solutions, adhering to all relevant shipping regulations.
How can I request a sample or quote for Direct Red 81?
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To request a sample or a quotation for Direct Red 81, please contact our sales team through the website or by phone.
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