Molekula
4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP) is a water-soluble substrate used in enzymatic assays, particularly for measuring alkaline phosphatase activity. It is a yellow compound that produces a colored product upon enzymatic hydrolysis, enabling spectrophotometric detection. CAS: 4264-83-9, Molecular Formula: C6H4NNa2O6P · 6H2O, Molecular Weight: 371.14 g/mol, Storage: 2 to 8 °C, Signal Word: Warning.
Molekula supplies 4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP) at ≥98.0% purity (HPLC) in 1 g, 5 g and 25 g packs, from £37.08 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 7 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
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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1 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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5 g — £60.40 per pack ex VAT · £72.48 inc. VAT
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25 g — £118.80 per pack ex VAT · £142.56 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 | Off-white to light yellow coloured crystalline powder |
| Purity (HPLC) | ≥98.0% |
| Solubility | Freely soluble in water |
| Moisture | 28.0 - 31.5% |
| Free Inorganic Phosphates | ≤ 1.0% |
| Identification (IR) | Conforms to Reference |
| pH (5% sol) | 8.0 - 10.5 |
| Molar Absorptivity | ≥ 9,600 |
| PNP content(by HPLC) | ≤100 ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 35359763 |
| CAS Number | 4264-83-9 |
| Molecular Formula | C6H4NNa2O6P · 6H2O |
| Molecular Weight | 371.14 |
| SMILES | C1=CC(=CC=C1[N+](=O)[O-])OP(=O)([O-])[O-].[Na+].[Na+] |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2919.90.3000 |
| Tariff Code | 2919900090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+330 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is 4-Nitrophenyl phosphate disodium salt hexahydrate used for?
It is primarily used as a substrate in enzyme assays, particularly for alkaline phosphatase, to measure enzyme activity through colorimetric detection.
What is the chemical formula and molecular weight of PNPP?
The formula is C6H4NNa2O6P · 6H2O with a molecular weight of 371.14 g/mol.
How should PNPP be stored?
Store at 2 to 8 °C in a cool, dry place, protected from light and moisture.
What grade is available for this product?
The product is specified at a purity of ≥98.0% by HPLC, suitable for laboratory research and assay applications.
Can Molekula supply PNPP in bulk quantities?
Yes, Molekula can supply PNPP in bulk; please contact our sales team for pricing and availability.
What documentation comes with my order?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
Where can I buy 4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP)?
Directly from Molekula, which lists 4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP) in 1 g, 5 g and 25 g packs from £37.08 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
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.