Preparation of 3-mercaptolactic acid and S-aminoethylmercaptolactic acid

A simple and accurate method is described for synthesis of 3-mercaptolactic acid and its derivative, S-aminoethylmercaptolactic acid. Some spectrometric data of compounds are reported as well as their melting points, some colorimetric reactions and thin layer chromatographic behaviour. S-Aminoethylmercaptolactic acid is also determined by amino acid analyzer.