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- W1570585960 abstract "Abstract The kinetics of hydrogen-deuterium exchange for the four individual protected amides of alumichrome, the Al3+ analogue of ferrichrome, have been studied by proton magnetic resonance. In the range 3 l pD l 7 the exchange rates are relatively invariant. A tighter binding to the metal as the pD is raised results in a conformational stability gain, which compensates for the known base catalysis of the intrinsic amide hydrogen exchange within this pD range. The analysis of the exchange kinetic data versus temperature within the framework of the absolute reaction rate theory yields the enthalpy (ΔH†) and entropy (ΔS†) contributions to the free energy of activation (ΔF†). Depending on the particular amide, ΔH† and ΔS† appear to vary over wider ranges than does ΔF†. On the average it is found that raising the pD from ∼3 to ∼7 increases ΔH† while decreasing ΔS†. It is proposed that while conformational fluctuations are of importance at low pD, at neutrality the exchange of certain amides might proceed through a higher energy barrier without significant exposure to the solvent." @default.
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- W1570585960 date "1973-02-01" @default.
- W1570585960 modified "2023-09-27" @default.
- W1570585960 title "The Solution Conformation of the Ferrichromes" @default.
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- W1570585960 doi "https://doi.org/10.1016/s0021-9258(19)44353-6" @default.
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