Molekula
Phenol red solution (0.5%)
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
Phenol red solution (0.5%) is a pH indicator dye used in biological and chemical assays to detect pH changes, particularly in cell culture media and microbiological tests. It shifts from yellow to red as pH increases, making it ideal for monitoring metabolic activity. This product is a sterile-filtered, aqueous solution with a 0.5% (w/v) concentration of phenol red. It contains no preservatives and is supplied in amber glass bottles to protect from light degradation. Hazardous in case of ingestion or skin contact; wear protective gloves and eyewear. Molekula supplies Phenol red solution 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90022247 |
| CAS Number | 143-74-8 |
| IUPAC Name | 4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol |
| EC Number | 205-609-7 |
| Molecular Formula | N/A |
| Molecular Weight | N/A |
| Exact Mass | 354.0562 |
| SMILES | C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O |
| InChIKey | BELBBZDIHDAJOR-UHFFFAOYSA-N |
| InChI | InChI=1S/C19H14O5S/c20-15-9-5-13(6-10-15)19(14-7-11-16(21)12-8-14)17-3-1-2-4-18(17)25(22,23)24-19/h1-12,20-21H |
| PubChem CID | 4766 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| Tariff Code | 3822190090 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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.
Synonyms
- 2-(Bis(4-hydroxyphenyl)methyliumyl)benzenesulfonate
- 3,3-bis(4-hydroxyphenyl)-3H-2,1??-benzoxathiole-1,1-dione
- Fenolipuna
- PHENOL RED
- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, (S,S-dioxide)
- phenolsulfonphthalein
- Phenolsulphonphthalein
- PSP (indicator)
- Sulfonphthal
- Sulphonthal
Frequently asked questions
What is Phenol red solution (0.5%) commonly used for?
This solution is primarily used as a pH indicator in biological buffers, cell culture media, and microbiological assays, changing color from yellow (acidic) to red/purple (alkaline).
How should Phenol red solution (0.5%) be stored?
Store at ambient temperature in a tightly sealed container, away from direct light and moisture to maintain stability.
What grade of Phenol red solution (0.5%) does Molekula supply?
Molekula supplies this product in **analytical grade** for laboratory and research applications.
Can Molekula supply Phenol red solution (0.5%) in bulk quantities?
Yes, bulk quantities are available upon request—contact our sales team for custom packaging options.
What safety documentation comes with an order of Phenol red solution (0.5%)?
Each order includes a **Safety Data Sheet (SDS)** and a **Certificate of Analysis (CoA)** confirming purity and batch specifications.
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.