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. Author manuscript; available in PMC: 2010 Jan 9.
Published in final edited form as: Molecules. 2008 Jan 31;13(2):204–211. doi: 10.3390/molecules13020204

Figure 1.

Figure 1

pH-Sensitivity of the extinction coefficients at 410 nm of p-nitroaniline (pNA) and p-nitrophenol (pNP). Measurements were made in triplicate in PBS adjusted to the appropriate pH. The observed pKa of pNP was 7.0.