PH-responsive surfaces

The reasons for the effect of pH on the catalytic properties of enzymes are numerous and will not be discussed here. For most enzymes, however, there is a pH at which they are optimally effective changing the pH to lower (more acidic) levels or to higher (more basic) levels will decrease the overall rate at which the associated chemical reaction occurs. In the region of the optimum pH, the reaction rate vs. pH response surface can usually be approximated reasonably well by a second-order, parabolic relationship. 

Figure 1. Temperature/pH response surface at 0.033 m rhamnose and 0.167 m proline. Graphical representation of the quantity (ppm) of 6-methyl-2,3-dihydro-(lH)-pyrrolizine.

A. Bousquet, E. Ibarboure, F.J. Teran, L. Ruiz, M.T. Garay, J.M. Laza, et al., PH responsive surfaces with nanoscale topography. Journal of Polymer Science Part A Polymer... 

Figure 4.11 (a) Schematic illustration of a self-assembled monolayer of malachite green-terminated aUcanethiol (MG-CN-SH) with pH- and ultraviolet-responsive wetting properties, (b) Curves A and B represent the ideal model for two kinds of pH-responsive surfaces with completely different pH responses. 

Bousquet A, Ibarboure E, Teran FJ, Ruiz L, Garay MT, Laza JM, et al. PH responsive surfaces with nanoscale topography. J Polym Sci A Polym Chem 2010 48 2982-90. 

Fig. 4.8 Scheme of pH-responsive surface functional groups in Si02 NPs, adopted from reference... 

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