Answer
--->Tyrosine is an amino acid contains aromatic ring in its structure,
---> Aromatic rings are unsaturated hydrocarbons and its very well known that hydrocarbons are non polar in nature,
---> As we know that " Like dissolves like" and here, Aromatic ring of tyrosine increasing its non-polar character. Therefore Tyrosine amino acid are more soluble in less polar solvents such as Methanol, ethanol as compared to very highly polar water.
---> As in question its is given that tyrosine amino acid is barely soluble in water, because water is very polar solvent and tyrsoine amino acid is not highly polar in such extent.
---> Generally peptides are polar highly in nature. but as we will increase the number of tyrosine amino acids in peptide, area of non-polar part of peptide will increase (due to the increase of aromatic ring) and therefore the non-polar nature of peptide will increase. And this non-polar nature of peptide will make them more soluble in non-polar solvent and decrease its solubility in water (because water is polar in nature).
Work Step by Step
--->Tyrosine is an amino acid contains aromatic ring in its structure,
---> Aromatic rings are unsaturated hydrocarbons and its very well known that hydrocarbons are non polar in nature,
---> As we know that " Like dissolves like" and here, Aromatic ring of tyrosine increasing its non-polar character. Therefore Tyrosine amino acid are more soluble in less polar solvents such as Methanol, ethanol as compared to very highly polar water.
---> As in question its is given that tyrosine amino acid is barely soluble in water, because water is very polar solvent and tyrsoine amino acid is not highly polar in such extent.
---> Generally peptides are polar highly in nature. but as we will increase the number of tyrosine amino acids in peptide, area of non-polar part of peptide will increase (due to the increase of aromatic ring) and therefore the non-polar nature of peptide will increase. And this non-polar nature of peptide will make them more soluble in non-polar solvent and decrease its solubility in water (because water is polar in nature).
