Molekula
CAPSO
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
CAPSO is a zwitterionic buffer compound widely used in biochemical research, pharmaceutical formulations, and protein stabilization due to its pH range (8.9–10.3) and low UV absorbance. It maintains solubility across a broad pH spectrum and is non-toxic, making it ideal for cell culture, enzyme assays, and chromatography applications. This chemical has a CAS number of 73463-39-5, molecular formula C9H19NO4S, and a molecular weight of 237.32 g/mol. It is stored at ambient conditions and carries no signal word for hazard classification.
Molekula supplies CAPSO in 100 g and 500 g packs, from £111.84 inc. VAT. It is made or sourced to order. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 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
On backorder — expected to ship by 5 December 2026
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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100 g — £93.20 per pack ex VAT · £111.84 inc. VAT
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500 g — £232.30 per pack ex VAT · £278.76 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 crystalline powder |
| Identification | Conforms to reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90030068 |
| CAS Number | 73463-39-5 |
| IUPAC Name | 3-(cyclohexylamino)-2-hydroxypropane-1-sulfonic acid |
| Molecular Formula | C9H19NO4S |
| Molecular Weight | 237.32 |
| Exact Mass | 237.1035 |
| SMILES | C1CCC(CC1)NCC(CS(=O)(=O)O)O |
| InChIKey | INEWUCPYEUEQTN-UHFFFAOYSA-N |
| InChI | InChI=1S/C9H19NO4S/c11-9(7-15(12,13)14)6-10-8-4-2-1-3-5-8/h8-11H,1-7H2,(H,12,13,14) |
| PubChem CID | 2733480 |
| REACH Code | Y113 |
| HTS Code | 29225050 |
| Tariff Code | 2922190090 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, 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
- 1-Propanesulfonic acid, 3-(cyclohexylamino)-2-hydroxy-
- 3-(cyclohexylamino)-2-hydroxy-1-propanesuhicic acid
- 3-(Cyclohexylamino)-2-hydroxy-1-propanesulfonic acid
- 3-(cyclohexylamino)-2-hydroxy-1-propanesulphonic acid
- 3-(cyclohexylamino)-2-hydroxypropane-1-sulfonic acid
- 3-(cyclohexylamino)-2-hydroxypropane-1-sulonic acid
- 3-(CYCLOHEXYLAMINO)-2-HYDROXYPROPANESULFONIC ACID
- CAPSO (buffer)
- Capso compound
- CAPSO, free acid
Frequently asked questions
What is CAPSO primarily used for?
CAPSO (3-(cyclohexylamino)-2-hydroxy-1-propanesulfonic acid) is commonly used as a buffering agent in biochemical and pharmaceutical applications, particularly in protein crystallization and pH-sensitive experiments.
What is the chemical formula and molecular weight of CAPSO?
The chemical formula of CAPSO is C₉H₁₉NO₄S, and its molecular weight is 237.32 g/mol.
How should CAPSO be stored?
CAPSO should be stored at ambient temperature in a cool, dry place, away from direct sunlight.
What grades of CAPSO does Molekula supply?
Molekula supplies CAPSO as a white crystalline powder that conforms to reference identification, suitable for research and laboratory applications.
Can Molekula supply CAPSO in bulk quantities?
Yes, Molekula can supply CAPSO in bulk, with quantities tailored to meet your specific research or production needs.
What documentation comes with a CAPSO order?
Each CAPSO order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Where can I buy CAPSO?
Directly from Molekula, which lists CAPSO in 100 g and 500 g packs from £111.84 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.