Abstract
Tetracrown-substituted metal phthalocyanines and metal phthalocyanine–crown ether mixtures are used as ionophores for plasticized PVC membranes of ion-selective electrodes for the ditopic binding and potentiometric determination of phenylalanine methyl ester. The complexation of the reagent with phenylalanine methyl ester is confirmed by extraction data and absorption spectra. Ion-selective electrodes are proposed for the monitoring of phenylalanine methyl ester in the biocatalytic synthesis of aspartame.
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