Cresol Red

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Cresol Red is used as a tracking dye in DNA, RNA (agarose) and protein (polyacrylamide) electrophoresis. In agarose, Cresol Red runs with an apparent molecular size of approx. 125 bp DNA. Cresol Red does not inhibit Taq polymerase. Recently Cresol Red has been used as a pH sensitive indicator dye in nanoengineered optical urea biosensors films and hetero-core structured fiber optic pH sensor.

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Cresol Red

gradeindicator grade
InChI KeyOBRMNDMBJQTZHV-UHFFFAOYSA-N
compositionDye content, 95%
useful pH range1.8 – 2.0, orange to yellow (acid)
7.0 – 8.8, yellow to violet (alkaline)
pH range7.2 – 8.8, yellow to red
absorptionλmax 367 nm (2nd)
λmax 570 nm