8Wang N H L,Yu Q,Kim S U.Cation-exchange of amino acid[J].Reactive Ploymers,1989,11:261-267.
9Selemenev V F,Zagorodni A A.Infrared spectroscopy of ion-exchange resins.Determination of amino acids ionic form in the resin phase[J].Reactive & Functional Ploymers,1999,39:53-62.
