Abstract
Aspartame, α- l-Asp- l-PheOMe dipeptide, is known through its artificial sweetener property [1,2]. The presence of the free α-amino and β-carboxyl groups on the aspartyl residue and a blocked carboxyl group on the phenyl alanine residue means that metal ions are most likely to be complexed by the aspartyl amine and β-carboxyl groups [3]. Very little data are available on the aspartame derivatives' affinity for metal ions [4]. An attempt has been made to study the stability of two metallic cation—aspartame systems pH-metrically in solution and by 1H NMR data.
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