N′-Octadecylfluorescein-5-thiourea
N′-Octadecylfluorescein-5-thiourea (CAS: 65603-18-1) is a fluorescent probe with the molecular formula C39H50N2O5S and a molecular weight of 658.89 g/mol. This compound is designed for applications requiring lipophilic and membrane localisation, serving as a valuable tool in biochemical research and detection methods. Its fluorescence properties make it suitable for various imaging and analytical techniques.
- IUPAC
- N-(Fluorescein-5-thiocarbamoyl)octadecylamine

Fluorescent Labeling
Utilised as a fluorescent probe for labeling biological molecules and structures. Its lipophilic nature aids in targeting membranes and hydrophobic regions within biological systems.
Membrane Studies
Investigates the properties and dynamics of cell membranes due to its lipophilic characteristics. It can be used to visualise membrane integrity and changes.
Biochemical Detection
Employed in various detection assays where fluorescence is the primary reporting mechanism. It helps in visualising or quantifying biological processes or components.
Fluorescence Microscopy
Suitable for fluorescence microscopy applications, enabling the visualisation of cellular structures or phenomena marked by this probe. Excitation and emission maxima are noted at 480 nm and 519 nm in methanol, respectively.
| Molecular weight | 658.89 |
|---|---|
| Empirical formula | C39H50N2O5S |
| Assay | ≥98.0% (HPCE) |
| Grade | for fluorescence |
| Solubility | DMF: solubleDMSO: solublealcohols: soluble |
| Storage temperature | 2-8°C |
| Melting point | ≥250 °C |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- 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) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Fluorescence | λex 480 nm; λem 519 nm in methanol |
|---|
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 N′-Octadecylfluorescein-5-thiourea used for?
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N′-Octadecylfluorescein-5-thiourea is primarily used as a lipophilic fluorescent probe for membrane studies, biochemical detection, and general fluorescence labeling in research applications.
What is the CAS number and chemical formula for N′-Octadecylfluorescein-5-thiourea?
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The CAS number is 65603-18-1 and the empirical formula (Hill notation) is C39H50N2O5S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies N′-Octadecylfluorescein-5-thiourea with a purity of ≥98.0% (HPCE) and it is graded for fluorescence. We do not represent this product as USP, BP, or EP grade.
How should N′-Octadecylfluorescein-5-thiourea be handled safely?
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Handle with appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves. This compound may cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Ensure good ventilation.
How is N′-Octadecylfluorescein-5-thiourea packed, shipped, and exported?
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This chemical is typically stored at 2-8°C. TSS exports fine chemicals globally, adhering to all necessary shipping regulations for chemical products.
How can I request a sample or quote for N′-Octadecylfluorescein-5-thiourea?
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Please contact the TSS sales department via our website or by phone to request a sample or a quotation for N′-Octadecylfluorescein-5-thiourea.
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