An amino acid molecule can interact within itself to form a zwitterion
A solution of amino acids can act as a buffer solution by resisting any small changes in pH
The isoelectric point of amino acids is the pH at which the amino acid exists as a neutral zwitterion
H2NCHRCOOH + HCl ⇌ H3N+CHRCOOH + Cl-
Reaction with aqueous alkalis
H2NCHRCOOH + NaOH ⇌ H2NCHRCOO- Na+ + H2O
Esterification with alcohols
H2NCHRCOOH + C2H5OH + H+ ⇌ H3N+CHRCOOC2H5 + H2O
A peptide bond is an amide bond between two amino acids
How chromatography can be used to separate a mixture of amino acids and identify the individual components
Remember that separating amino acids using chromatography depends on the relative solubilities of the amino acids in the mobile and stationary phases.
It does not depend on the size of the amino acids.