Don't treat the rules too dogmatically. The solubility of amino acids is not a simple dependence of the solvent polarity. There are no non-polar amino acids - they are only more or less polar. Amino acid racemates often have very different solubilities from pure enantiomers, although they are a physical mixture of these enantiomers. The highly polar Asp and Glu have lower solubilities than the less polar Phe.
https://www.semanticscholar.org/paper/Solubilities-of-the-common-L-%CE%B1-amino-acids-as-a-of-Amend-Helgeson/94df8ddf7af41b33ee734810e94e39b7a0cfb5ff see Table 1
Don't treat the rules too dogmatically. The solubility of amino acids is not a simple dependence of the solvent polarity. There are no non-polar amino acids - they are only more or less polar. Amino acid racemates often have very different solubilities from pure enantiomers, although they are a physical mixture of these enantiomers. The highly polar Asp and Glu have lower solubilities than the less polar Phe.
https://www.semanticscholar.org/paper/Solubilities-of-the-common-L-%CE%B1-amino-acids-as-a-of-Amend-Helgeson/94df8ddf7af41b33ee734810e94e39b7a0cfb5ff see Table 1
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https://www.semanticscholar.org/paper/Solubilities-of-the-common-L-%CE%B1-amino-acids-as-a-of-Amend-Helgeson/94df8ddf7af41b33ee734810e94e39b7a0cfb5ff
see Table 1
https://www.semanticscholar.org/paper/Solubilities-of-the-common-L-%CE%B1-amino-acids-as-a-of-Amend-Helgeson/94df8ddf7af41b33ee734810e94e39b7a0cfb5ff
see Table 1
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