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Marrelli, Luigi
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document
A molecular thermodynamic model for potentiometric titration of poly-L-glutamic acid
Abstract
In this work, experimental titration curves of poly-L-giutamic acid are reported at two ionic strengths (0.1 and<br/>0.5 M NaCI) at 25°C. A simple extension of the counterion condensation theory is proposed in order to<br/>account for the pH-induced conformational transition. The model assumes a variable distance between titrable<br/>sites in the charge induced transition from o-helix to extended coil structure. Calculations are in good<br/>agreement with experimental results and show the right change of concavity in titration curves with respect to<br/>models that assume constant distance between titrable sites.