Effect of amino acid sequence on the hydrophobicity of small peptides

It implied that enthalpy was the major driving force in all the adsorption processes. Furthermore, ΔH° and ΔS° became more negative as the alkyl chain length was increased. It revealed that the van der Waal's interaction had greater influence on the adsorption as the chain length increased. It was also found that, the contribution of each amino acid to peptide's hydrophobicity was affected by the position of the amino acid. When a hydrophobic amino acid was positioned in the middle of a peptide chain, it exhibited the highest hydrophobicity. Interestingly, tryptophan at the carboxyl end was found more hydrophobic than it at the amino end of the peptide.