Cresol red CAS:1733-12-6 is a color marker and pH indicator for various laboratory procedures. As a color marker in agarose and polyacrylamide electrophoresis at 1% it runs at 125 base pair size, and as a titrant indicator Cresol Red is yellow below pH 7.2 and purple at pH 8.8 and above. Cresol red CAS:1733-12-6 is used as a tracking dye in DNA, RNA (agarose) and protein (polyacrylamide) electrophoresis. In agarose, the apparent molecular size of cresol red was about 125 BP DNA. Cresol red did not inhibit Taq polymerase. In recent years, cresol red has been used as a pH sensitive indicator dye in nano optical urea biosensor and heteronuclear optical fiber pH sensor. Cresol red CAS:1733-12-6 could be supplied in commercial size with competitive price.
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