Amino Acid Ionic Liquid Coated Magnetic Core Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Nanoparticles Coupled with UV Spectrophotometry for the Separation /Analysis Congo Red

Abstract

Congo red has strong tinting strength, low price that it was used in meat dyeing. Amino acid ionic liquids (AAILs) containing amino acid cations or anions are synthesized from natural amino acids, which has the characteristics of low toxicity. Nowadays, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@AAIL composites has seemly not been reported for the separation/analysis of congo red. In this work, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@AAIL nanoparticles were used as magnetic solid phase adsorbents in combination with UV spectrophotometry for separation of congo red.