HEPES (Ultra Pure), powder


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Cell culture media supplemented with HEPES exhibit more effective buffering in the physiological pH range with most cell cultures than media using the normal bicarbonate buffering system alone. Atlanta Biologicals offers HEPES as a powder and as a 1M solution in cell culture grade water.

Catalog #: R351
SizePriceCatalog #Quantity
100 gm$88.90R35110
500 gm$254.00R35150

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HEPES (N-2-hydroxyethylpiperazine-N’-2-ethanesulfonic acid) is a commonly used zwitterionic buffer with a pKa of 7.3 at 37°C.

HEPES should be used in addition to, not instead of, sodium bicarbonate, as it is important to maintain sufficient bicarbonate in the medium for nutritional purposes. HEPES may be added to cell culture media at a final concentration of 10mM to 25mM to provide additional buffering capacity if required. Lower concentrations are usually not adequate to control fluctuations in pH, and higher concentrations are often toxic. Since the buffering capacity of HEPES is independent of the CO2 concentration, it is an ideal buffer for maintaining the pH of cultures when cell cultures require extended periods of manipulation outside of a CO2 incubator. HEPES buffered media are resistant to rapid, drastic pH changes, but will not prevent pH shifts entirely. Since high levels of HEPES can cause cytotoxicity, concentrations of this organic buffer should be reduced if toxicity is apparent for a specific cell line or primary cell culture.


  • Recommended concentration: 10mM to 25mM
  • Form: Powder
  • Product Size: 500 gm, 100 gm
  • Quality Testing: Pass
  • Suitability: Laboratory research applications
  • Shipping conditions: Ambient
  • Storage conditions: Room temperature, under dry conditions