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. 2014 Apr 22;30(32):9625–9636. doi: 10.1021/la500057j

Scheme 1. Estimate of the Ion Pairing Strength of a Zwitterion.

Scheme 1

Ka for polycarboxybetaines is combined with that of the polycarboxylate to arrive at an estimate of the ion pairing strength of a zwitterion, 1/K1 = 103.1, where the zwitterion carboxylate is represented by ⊖ and pyridinium by ⊕.