Résumé
2-Methyl-oxazolinones and thio-thiazolidones representative of aromatic and aliphatic amino acids were hydrolysed by .alpha.-chymotrypsin and subtilisin. The parametric reatio kcat/Km, correlated with the enantiomeric enrichment of the reaction product, indicates that thio-thiazolidones are converted to free amino acids by enzyme with the higher degree of stereospecificity.