Molekula
N-Ethylmaleimide
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
N-Ethylmaleimide is a chemical compound used primarily as a sulfhydryl-reactive agent in biochemistry and protein modification. It functions as an alkylating agent, commonly employed in enzyme inhibition and protein cross-linking studies. Available in 100g, 500g, and 1kg packaging, it has a molecular weight of 125.13 g/mol, a molecular formula of C6H7NO2, and a CAS number of 128-53-0. Store at 2 to 8 °C. Molekula supplies N-Ethylmaleimide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £199.60 per pack ex VAT · £239.52 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White to light yellow crystals |
| Melting Point | 41° - 46℃ |
| Identification | Conforms to reference |
| Solubility | Clear to slightly hazy, colourless to slightly yellow at 50 mg/ml in 95% ethanol |
| Assay | ≥99.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Flash Point | 72 °C |
| Transport Class | 6.1 (8) |
| Packing Group | II |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 45.5 °C |
Source: PubChem CID 4362 (DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 20980577 |
| CAS Number | 128-53-0 |
| IUPAC Name | 1-ethylpyrrole-2,5-dione |
| EC Number | 204-892-4 |
| Molecular Formula | C6H7NO2 |
| Molecular Weight | 125.13 |
| Exact Mass | 125.0477 |
| SMILES | CCN1C(=O)C=CC1=O |
| InChIKey | HDFGOPSGAURCEO-UHFFFAOYSA-N |
| InChI | InChI=1S/C6H7NO2/c1-2-7-5(8)3-4-6(7)9/h3-4H,2H2,1H3 |
| PubChem CID | 4362 |
| UN Number | UN2928 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29251942 |
| Tariff Code | 2925199590 |
Safety & GHS
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Corrosive
GHS05
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Toxic
GHS06
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Health Hazard
GHS07
Hazard statements
- H300 Fatal if swallowed
- H311 Toxic in contact with skin
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H317 May cause an allergic skin reaction
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1-Ethyl-1H-pyrrole-2,5-dione
- 1-ethylpyrrole-2,5-dione
- 1H-pyrrole-2,5-dione, 1-ethyl-
- ethylmaleimide
- maleic acid N-ethylimide
- maleimide, N-ethyl-
- n-ethylmaleimide (nem)
- NEM
- USAF B-121
Frequently asked questions
What is N-Ethylmaleimide used for?
N-Ethylmaleimide is commonly used as a sulfhydryl-reactive reagent in biochemistry and protein chemistry for modifying cysteine residues.
What is the chemical formula and molecular weight of N-Ethylmaleimide?
The formula is C6H7NO2 and the molecular weight is 125.13 g/mol.
How should N-Ethylmaleimide be stored?
It should be stored at 2 to 8 °C to maintain stability and prevent degradation.
What grade of N-Ethylmaleimide does Molekula supply?
Molekula supplies N-Ethylmaleimide in high-purity research grade.
Can Molekula supply N-Ethylmaleimide in bulk?
Yes, Molekula can supply N-Ethylmaleimide in bulk quantities—please contact our sales team for details.
What documentation comes with an order of N-Ethylmaleimide?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.