Phenol Red

What Is Phenol Red?


Phenol red is a water-soluble dye used as a pH indicator, changing from yellow to red over pH 6.6 to 8.0, and then turning a bright pink color above pH 8.1. As such, phenol red can be used as a pH indicator dye in various medical and cell biology tests.

Uses for Phenol Red


Phenol red has several uses, including:

  • Most commonly, phenol red is an indicator dye, used as an acid pH indicator with a transition point of 7.5 (acid side to yellow / alkaline side to red)
  • Biologists use phenol red in cell cultures as a pH indicator
  • Phenol red has been used in the PSP test for kidney functions
  • Most recently, medical researchers have discovered that phenol red can serve as an estrogen mimic and is used in the process of in vitro fertilization
  • Phenol red is a dye used in automotive coolants

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