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Metacresol purple

Chemical compound From Wikipedia, the free encyclopedia

Metacresol purple
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Metacresol purple or m-cresol purple, also called m-cresolsulfonphthalein, is a triarylmethane dye and a pH indicator. It is used as a capnographic indicator for detecting detect end-tidal carbon dioxide to ensure successful tracheal intubation in an emergency.[1][2] It can be used to measure the pH in subzero temperatures of saline or hypersaline media.[3]

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In colorimetric capnography, the indicator is incorporated in an aqueous matrix that provides a pH just above the indicator's colour change.[4] When exposed to carbon dioxide (CO2), it undergoes a colour change from purple to yellow, because when CO2 dissolves in the matrix, it forms carbonic acid.[5]

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
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