Ergosterol
Ergosterol (CAS: 57-87-4), a sterol with the molecular formula C28H44O and a molecular weight of 396.65 g/mol, is a crucial biochemical compound. It functions as a precursor to Vitamin D2 and is found in fungi and some other organisms. Ergosterol is primarily utilised as an analytical standard and in biochemical research, playing a vital role in the study of sterol metabolism and fungal biology.
- IUPAC
- 3β-Hydroxy-5,7,22-ergostatriene,5,7,22-Ergostatrien-3β-ol,Provitamin D2
- Synonyms
- 5,7,22-Ergostatrien-3-ol3β-Hydroxy-5,7,22-ergostatrieneProvitamin D2

Analytical Standard
Ergosterol serves as a key analytical standard for quantitative and qualitative analysis. It is employed in chromatographic techniques to identify and quantify sterols in various matrices, ensuring accuracy in research and quality control.
Biochemical Research
As a significant biological molecule, ergosterol is used in biochemical studies. Its role as a precursor to Vitamin D2 and its presence in fungal cell membranes make it valuable for investigating metabolic pathways and cell wall synthesis.
Provitamin D2 Synthesis
Ergosterol is the direct precursor to Vitamin D2 (ergocalciferol). Upon exposure to ultraviolet (UV) radiation, it undergoes a photochemical reaction to form Vitamin D2, which is essential for calcium absorption and bone health.
| Molecular weight | 396.65 |
|---|---|
| Empirical formula | C28H44O |
| Assay | ≥75% |
| Grade | analytical standard |
| Concentration | 10 mg/mL in chloroform |
| Storage temperature | 2-8°C |
| Melting point | 156-158 °C(lit.) |


Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H336May cause drowsiness or dizziness
- H351Suspected of causing cancer
- H361D
- H373May cause damage to organs through prolonged exposure
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P281Use personal protective equipment as required
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US) |
|---|---|
| Transport (UN / ADR) | UN 1888 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-38-40-48/20/22 |
| Safety statements (S) | 36/37 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Cofa | certificate of analysis is enclosed in each package. |
|---|---|
| Packaging | ampule of 1 mL |
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 Ergosterol used for?
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Ergosterol is primarily used as an analytical standard in chromatography and biochemical research. It also serves as a precursor for the synthesis of Vitamin D2.
What is the CAS number and molecular formula for Ergosterol?
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The CAS number for Ergosterol is 57-87-4, and its molecular formula is C28H44O.
What grade and purity does Tech Serve Solutions supply for Ergosterol?
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Tech Serve Solutions supplies Ergosterol with an assay of ≥75% and a grade of analytical standard. We do not represent this product as USP, BP, or EP grade.
How should Ergosterol be handled and stored?
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Ergosterol is classified with warning signal words and hazard statements including H302+H332 (Harmful if swallowed or inhaled), H315 (Causes skin irritation), H319 (Causes serious eye irritation), H336 (May cause drowsiness or dizziness), H351 (Suspected of causing cancer), H361d (Suspected of damaging the unborn child), and H373 (May cause damage to organs through prolonged or repeated exposure). It should be stored at 2-8°C and handled with appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator.
How is Ergosterol packaged and exported by Tech Serve Solutions?
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Ergosterol is packaged in 1 mL ampoules and exported by Tech Serve Solutions with a certificate of analysis enclosed.
How can I request a quote or sample for Ergosterol?
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To request a quote or sample for Ergosterol, please contact our sales team via the website or provide your details through the enquiry form.
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