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Synthesis and Characterization of New Physiologically Active Amino Acid Schiff Bases

Yi Guo

Abstract

Three amino acid Schiff bases are synthesized through reaction of L asparagine with salicylaldehyde,2 hydroxy 3 methoxy benzaldehyde and 2,4 dihydroxy benzaldehyde in methanol and the products are precipitated in isopropanol.The yields are 84.3%,81.2% and 76.7% respectively.The Schiff bases are characterized with elementary analysis,IR spectra and UV spectra and their scavenging effect on O 2 · are investigated by means of EPR technology.The results show that their O 2 · scavenging ratio are up to 63.4%,62.0% and 84.2% respectively when the mass concentration is 5 kg/m 3.It is proved that the synthesized Schiff bases show good physiological activities.

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Key concepts: Salicylaldehyde, Benzaldehyde, Chemistry, Schiff base, Methanol, Electron paramagnetic resonance, Amino acid, Mass spectrum