An amino acid is an organic molecule.
The most frequent and most interesting amino acids are those that are part of proteins.
The binding of several amino acids gives rise to chains called peptides or polypeptides.
The last of the 20 common amino acids that was discovered was threonine in 1935, by William Cumming Rose, who also determined essential amino acids and established the minimum daily requirements of all amino acids for optimal growth.
In 1902, Emil Fischer and Franz Hofmeister proposed that proteins are the result of the formation of bonds between the amino group of one amino acid and the carboxyl group of another, in a linear structure that Fischer called “peptide” (1)
The amino acids that must be obtained from food and can not be synthesized by the body are called essential. The lack of these amino acids in the diet limits the development of the organism.
For the human being, the essential amino acids are: