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. Author manuscript; available in PMC: 2013 Sep 4.
Published in final edited form as: Anal Chem. 2012 Aug 21;84(17):7511–7517. doi: 10.1021/ac301629s

Figure 5.

Figure 5

Calculated structures of lowest energy for citric acid and L-tartaric acid. Both the neutral and deprotonated forms are shown. The deprotonation site is indicated with a circle and relative Gibbs free energies are reported in kcal•mol−1.