On the meaning of enzymatic superactivity in reverse micelles |
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Authors: | Eli Ruckenstein Prakash Karpe |
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Institution: | (1) Department of Chemical Engineering, State University of New York at Buffalo, 14260 Buffalo, N. Y. |
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Abstract: | Summary Two types of superactivity can be defined. One, is with respect to the activity for a fixed average substrate concentration in the water pool; the pushing of the charged substrate by the likewise charged micellar surface is responsible for the superactivity and its bell-shaped dependence on the hydration ratio. The other, is with respect to the activity in a bulk aqueous solution having a substrate concentration equal to a fixed overall concentration S–]ov in the entire reverse micellar solution. In this case, the pushing effect, the constraint of a fixed S–]ov and the partitioning of the substrate in the surfactant layer are responsible for the bell-shaped dependence. Superactivity exists for low substrate partitioning in the surfactant layer, subactivity for high partitioning. |
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