title: [Synthesis and spectral characteristics of selenium-chelated methionine with hexagon].
abstract: Using methionine and anhydrous ethanol as raw material, p-toluene sulfonic acid as catalyst, and benzene as a carrying water agent, methionine ester was first synthesized. Then, selenium-chelated methionine was prepared through the reaction of methionine ester with sodium selenite by a certain proportion, settling and crystallizing at lower temperature. The xi potential of the resultant was determined by micro-electrophoresis, through which the isoelectric point was calculated. Based on the principle of isoelectric point, it was separated and purified. The spectral properties of the resultant were analyzed by infrared spectrum, utraviolet spectrum, X ray diffraction analysis and 1H-NMR, from which we got the information of the resultant structure that has a hexagon composing of sulfur atom of methionine, nitrogen of amine and central selenium ion of four-valence.
authors.affiliation: College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China. lejin2003@163.com
authors.forename: Li-E
authors.initials: LE
authors.lastname: Jin
authors.forename: Xiao-Juan
authors.initials: XJ
authors.lastname: Wang
authors.forename: Fan-Fan
authors.initials: FF
authors.lastname: Shen
authors.forename: Qing
authors.initials: Q
authors.lastname: Cao