 aspartic acid (abbreviated as d-aa, asp, or d). is an Î±-amino acid with the chemical formula hoocch(nh2)ch2cooh. the carboxylate anion and salts of aspartic acid are known as aspartate. the l-isomer of aspartate is one of the 23 proteinogenic amino acids, i.e., the building blocks of proteins. its codons are gau and gac. aspartic acid is, together with glutamic acid, classified as an acidic amino acid with a pka of 3.9, however in a peptide the pka is highly dependent on the local environment. a pka as high as 14 is not at all uncommon. aspartate is pervasive in biosynthesis. as with all amino acids, the presence of acid protons depends on the residue's local chemical environment and the ph of the solution. ==discovery== aspartic acid was first discovered in 1827 by plisson, derived from asparagine, which had been isolated from asparagus juice in 1806, by boiling with a base.{{cite book |author= r.h.a. plimmer |editor= r.h.a. plimmer & f.g. hopkins |title= the chemical composition 
Acidic_amino_acids Dicarboxylic_acids Glucogenic_amino_acids NMDA_receptor_agonists Neurotransmitters Proteinogenic_amino_acids Urea_cycle