Hydration Energy of Single Amino Acids

[Matt Jones]

Hi all,

Can someone please give me a reference on the hydration energy of amino
acids in solution, not incorporated into proteins? I have a paper by
Beveridge and colleagues from several years ago, modelling the hydration
of glycine zwitterion. However, I need to know what sorts of range exists
and whether smaller amino acids are more or less hydrated than larger
ones. 

Thanks,

Matt Jones