

Chlorophenol Red (Highly Pure) by Molecular Depot is a chlorophenol red, a sulfonephthalein pH indicator changing from yellow to red between about pH 5.2 and 6.8. Sulfonephthalein indicators change colour over roughly two pH units around their pKa, and chlorophenol red covers the mildly acidic range where many bacterial fermentation tests are read. It is used as a pH indicator in microbial fermentation media, as the indicator in chromogenic enzyme substrates and in titration and buffer work. Each unit contains 5 g. MBP supplies Molecular Depot research reagents to research labs in the United States, Canada and worldwide.