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Hepes has high solubility and is membrane impermeable
Sulfates ppm <= 200
in Pb <= 3 ppm o
HEPES has no nutritional benefit to cells
Hepes 250g (PH.EUR., USP) Cell & Tissue Media Hepes has high solubility andHEPES (4 (2 Hydroxyethyl)piperazine 1 ethane sulfonic acid) has been described as one of the best all purpose buffers available for use in biological research. The molecule is zwitterionic at most biological pHs and is most effective as a buffer at pH 6. 0 to 8. 5. May be used in isoelectric focusing applications and as a buffer in the quantitative and selective measurement of antigen antibody reactions. HEPES has no nutritional benefit to cells. The
