Glycine (Gly) is the simplest and the only α-amino acid without any optical isomer. Gly plays the role of detoxification in the human body. When the aromatic substances get into the body, Gly combines them into non-toxic substances and then excreted them by the liver oxidation, such as react with benzoic acid (preservative) to generate hippuric acid to excrete from the body. Gly can also be used to produce some anti-cancer drugs. For instance, the series of anti-cancer drugs made by Gly and diazocompound have a significant effect on gastric cancer. Gly and its derivatives are used as sole antibacterial agent in foods and drinks. Glycine and its derivatives exhibit a wide spectrum of biological activities such as cytotoxic and anti tumour properties,
