HEPES钠盐 [超纯级]，HEPES, Sodium Salt, ULTROL® Grade；A zwitterionic N-substituted aminosulfonic acid buffer. Useful in the pH 6.8-8.2 range. Has a pKa of 7.55 at 25°C. Absorbance (1.0 mM, H2O, 260 nm):0.10.
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