o-Cresolphthalein
ALDRICH/C85778 - indicator grade
CAS Number: 596-27-0
Empirical Formula (Hill Notation): C22H18O4
Molecular Weight: 346.38
EC Number: 209-881-8
MDL Number: MFCD00005912
Linear Formula: C22H18O4
Product Type: Chemical
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: C85778-10G
| ε (extinction coefficient) | ≥10000 at 294-300 nm |
| ≥39000 at 564-570 nm | |
| ≥5000 at 378-384 nm | |
| λmax | 381 nm (2nd) |
| 566 nm | |
| application(s) | diagnostic assay manufacturing hematology histology |
| color | beige |
| form | powder |
| grade | indicator grade |
| InChI | 1S/C22H18O4/c1-13-11-15(7 |
| InChI key | CPBJMKMKNCRKQB-UHFFFAOYSA |
| mp | 219-221 °C (lit.) |
| pH | 8.2-9.8, colorless to red |
| Quality Level | 200  |
| SMILES string | Cc1cc(ccc1O)C2(OC(=O)c3cc |
| storage temp. | room temp |
| technique(s) | titration: suitable |
| Application: | O-Cresolphthalein has been used as a component in calcifying media for calcification assay. |
| Biochem/physiol Actions: | o-Cresolphthalein is a reversible pH indicator. The kinetics of the reverse pathway (red-purple to colorless) is slow, thereby making it an appropriate molecule to check flow patterns in ducts with corrugated walls. It is also used for the colorimetric determination of calcium content via the o-cresolphthalein complexone method. Binding of calcium to o-cresolphthalein, in the presence of alkaline conditions (pH 10-12), results in the formation of a red complex with an absorbance at 570-575nm. |
| Packaging: | 10 g in glass bottle |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 3 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| mp | 219-221 °C (lit.) |
| Storage Temp. | room temp |
| UNSPSC | 12171500 |