UV SPECTROPHOTOMETRIC MICRODETERMINATION OF L-DOPA BASED ON COMPLEX-FORMATION WITH COPPER(II)ION

The UV spectrophotometric investigations obtained for the reaction bet ween L-DOPA and copper(II)ion contribute to the clarification of equil ibrium conditions of the complex formation both in the excess of metal ion and ligand. For the complex obtained in the excess of copper(II)i on optimum conditions were established as well as the stoichiometric c omposition(1:1) and conditional stability constant logK' =5.70+/-0.05. The proposed method using copper(II)ion, as the analytical reagent in excess, for the UV spectrophotometric determination is suitable for a ccurate, sensitive and selective analysis of L-DOPA both in pure and d osage forms containing benzerazide.