Metacresol purple
| Identifiers | |
|---|---|
| 3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.017.237 |
| PubChem CID |
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| |
| Properties | |
| C21H18O5S | |
| Molar mass | 382.43 g·mol−1 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Metacresol purple or m-cresol purple, also called m-cresolsulfonphthalein is a triarylmethane dye and a pH indicator that is used in medicine to detect end-tidal carbon dioxide to ensure successful tracheal intubation in an emergency as the indicator inside a colorimetric carbon dioxide detector.[1][2]
In colometric capnography the indicator is incorporated in a matrix that provides a pH just above the indicator's colour change[3], it undergoes the colour change from purple to yellow with CO2; (a yellow colour often described as gold) when CO2 dissolves as CO2 is acidic.[4]
In chemistry, it has two useful indicator ranges:[2]
- pH 1.2–2.8: red to yellow
- pH 7.4–9.0: yellow to purple
| Metacresol purple (pH indicator) | ||
| below pH 7.4 | above pH 9.0 | |
| 7.4 | ⇌ | 9.0 |
| Metacresol purple (pH indicator) | ||
| below pH 1.2 | above pH 2.8 | |
| 1.2 | ⇌ | 2.8 |
See Also
References
- ↑ "Capnography". LITFL • Life in the Fast Lane Medical Blog. Retrieved 2017-07-30.
- 1 2 "m-Cresol Purple 857890". Sigma-Aldrich. Retrieved 2017-07-30.
- ↑ Gedeon, A.; Krill, P.; Mebius, C. (1994-09-01). "A new colorimetric breath indicator (Colibri)". Anaesthesia. 49 (9): 798–803. ISSN 1365-2044. doi:10.1111/j.1365-2044.1994.tb04457.x.
- ↑ Hagberg, Carin A. (2007-02-23). Benumof's Airway Management. Elsevier Health Sciences. ISBN 0323070175.
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