 | |
 | |
| Names | |
|---|---|
| Preferred IUPAC name 3,3-Bis(4-hydroxy-3-methylphenyl)-2,1λ6-benzoxathiole-1,1(3H)-dione | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider |
|
| ECHA InfoCard | 100.015.513 |
| UNII | |
| |
| |
| Properties | |
| C21H17NaO5S | |
| Molar mass | 382.43 g/mol |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Cresol red (full name:o-cresolsulfonephthalein)[1] is atriarylmethane dye frequently used for monitoring thepH inaquaria.
| Cresol red(pH indicator) | ||
| below pH 7.2 | above pH 8.8 | |
| 7.2 | ⇌ | 8.8 |
Cresol red can be used in many common molecular biology reactions in place of other loading dyes. Cresol Red does not inhibitTaq polymerase to the same degree as other common loading dyes.
Cresol red can also be used as anelectrophoretic color marker to monitor the process ofagarose gel electrophoresis andpolyacrylamide gel electrophoresis. In a 1% agarose gel, it runs approximately at the size of a 125 base pair (bp)DNA molecule (it depends on the concentration of buffer and other component).Bromophenol blue andxylene cyanol can also be used for this purpose.
