Fluorescent Brightener 28
Fluorescent Brightener 28 (CAS: 4404-43-7, Formula: C40H44N12O10S2) is a chemical compound with a molecular weight of 916.98 g/mol. It functions as an optical brightening agent, enhancing the whiteness and brightness of materials. Its specific applications include use in biological staining and as a component in various research and industrial formulations requiring fluorescence.
- IUPAC
- Calcofluor White M2R,Tinopal UNPA-GX
- Synonyms
- Calcofluor White M2RTinopal UNPA-GX

Biological Staining
Fluorescent Brightener 28 serves as a valuable stain in biological research. It is particularly useful in cell biology and histology for visualizing cellular structures and components under fluorescent microscopy, aiding in diagnostic and research applications.
Fluorescent Dye
As a fluorescent compound, it can be incorporated into various materials to impart fluorescence. This property is leveraged in specific industrial applications where visual enhancement through fluorescence is desired.
Research Reagent
This brightener is employed as a reagent in diverse scientific investigations. Its chemical properties make it suitable for use in molecular biology and plant biotechnology studies, contributing to experimental outcomes.
| Molecular weight | 916.98 |
|---|---|
| Empirical formula | C40H44N12O10S2 |

Hazard statements
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36 |
| Safety statements (S) | 26 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
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 Fluorescent Brightener 28 used for?
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Fluorescent Brightener 28 is used as a fluorescent stain in cell biology and histology, and as a fluorescent dye in various research and industrial applications.
What are the CAS number and formula for Fluorescent Brightener 28?
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The CAS number is 4404-43-7 and the empirical formula (Hill notation) is C40H44N12O10S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this product typically as a research or technical grade chemical. We do not represent it as meeting USP, BP, or EP pharmacopoeia standards unless explicitly stated in the product specifications. Please refer to the product specifications for detailed purity information.
What are the safety and handling precautions for Fluorescent Brightener 28?
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Fluorescent Brightener 28 is classified as an irritant (GHS07, H319). Handle with appropriate personal protective equipment, including a dust mask (type N95), eyeshields, and gloves. In case of eye contact, rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
Is Fluorescent Brightener 28 available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Fluorescent Brightener 28, ensuring it can be shipped worldwide.
How can I request a sample or quote for Fluorescent Brightener 28?
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To request a sample or a quote, please contact our sales team through the website or by phone, providing the product name and CAS number (4404-43-7).
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