Cresol red
SIAL/114472 - indicator grade, Dye content 95 %
Synonym: o-
CAS Number: 1733-12-6
Empirical Formula (Hill Notation): C21H18O5S
Molecular Weight: 382.43
EC Number: 217-064-2
MDL Number: MFCD00005878
Linear Formula: C21H18O5S
Product Type: Chemical
| λmax | 367 nm (2nd) |
| 570 nm | |
| application(s) | diagnostic assay manufacturing hematology histology |
| color | red-brown |
| composition | Dye content, 95% |
| density | 0.998 g/cm3 |
| form | powder or crystals |
| grade | indicator grade |
| InChI | 1S/C21H18O5S/c1-13-11-15( |
| InChI key | OBRMNDMBJQTZHV-UHFFFAOYSA |
| mp | 290 °C |
| pH | 7.2-8.8, yellow to red |
| Quality Level | 200  |
| SMILES string | Cc1cc(ccc1O)C2(OS(=O)(=O) |
| storage temp. | room temp |
| technique(s) | titration: suitable |
| useful pH range | 1.8-2.0, orange to yellow(acid) |
| 7.0-8.8, yellow to violet(alkaline) |
| Application: | Cresol Red is a widely used pH indicator for routine pH assessments like microbial culture media preparations. In addition, Cresol red is a suitable constituent of PCR reagent systems. Cresol Red is used as a tracking dye in DNA, RNA (agarose), and protein (polyacrylamide) electrophoresis. |
| General description: | Cresol Red, also known as o-cresol red, belongs to the phthalein and sulphonphthalein group of dyes. Cresol red changes color from orange to yellow at pH between 0.2-1.8 and yellow to violet at pH between 7.0-8.8. In alkaline solutions, cresol red is present as a hydrophilic dianion. The dianion is small and is violet in color, possessing a larger conjugated system than the yellow hydroxyquinone. |
| Packaging: | 5, 25 g in glass bottle |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-36 |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 3 |
| mp | 290 °C |
| Density | 0.998 g/cm3 |
| Storage Temp. | room temp |
| UNSPSC | 12171500 |