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pH-Sensitive Interactions between Cellulose Nanocrystals and DOPC Liposomes.
Biomacromolecules 2017 September 12
The interaction of 1,2 dioleolyl-sn-glycero-3-phosphatidylcholine (DOPC) vesicles with cellulose nanocrystals (CNCs) using several complementary techniques. Dynamic light scattering, zeta-potential, cryo-transmission electron microscopy and isothermal titration calorimetry (ITC) analyses confirmed the formation of pH-dependent CNC-liposome complexes. ITC was used to characterize the thermodynamic properties of this interaction. Positive values of enthalpy were found at pH lower than 5 where the charge sign of the constituents was opposite. The association was more pronounced at lower pH, as indicated by the higher values of association constant. We suggest that the positive enthalpy is derived from the release of counterions from the particle hydration shell during the association and that the charge of the vesicles plays a significant role in this interaction.
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