羟乙基哌嗪乙硫磺酸，HEPES, Free Acid, ULTROL® Grade；A zwitterionic N-substituted aminosulfonic acid buffer. Useful in the pH 6.8-8.2 range. Has a pKa of 7.48 at 25°C. Absorbance (1.0 M, H2O, 260 nm):≤0.05.
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