HEPES is a zwitterionic organic buffer that is also used to maintain physiological pH of cell culture media. HEPES is recommended when the cell culture system is very sensitive, increasing the buffering capacity and stabilizing the pH within the range of 7.2 to 7.6, and is not dependent on CO2 levels.
Top Features
Zwitterionic buffer
Liquid formulation with high solubility
Easy-to-use 1M solutionIdeal for biochemistry, cell culture, and molecular biology applications
High solubility
Membrane impermeability
Limited effect on biochemical reactions
Very low visible and ultraviolet light absorbance
Chemically and enzymatically stable
Easy to prepare
pKa of HEPES is temperature dependent:
At 25ºC: pKa= 7.48
At 37ºC: pKa= 7.31