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This is the case with adsorption of tryptophan, an essential amino acid that is present in many structural or enzyme proteins, into SBA-15 materials (Balas et al. 2008).
If the silica matrix is not previously functional- ized with certain groups, it is not able to uptake any tryptophan into the mesopores due to the hydrophobic nature of this amino acid.
However, an organic modification of the silica walls of SBA-15 with quaternary alkyl amines (Figure 2.13) changes the hydrophobicity of the carrier surface, which promotes the tryptophan adsorption into the mesopores.
FIGURE 2.13 Schematic representation of the host-guest interaction that takes place between quaternary alkyl amine groups from the functionalized matrix walls and carboxylic groups from tryptophan amino acid.
The increase of the amino acid adsorption is explained by the strong interactions that take place between the hydrophobic alkyl chains and the indole group from the tryptophan.
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