“…However, the proposed stoichiometry was limited to LMW complexes such as Cd 1 L 1 and Cd 1 L 2 for GSH and PC 2 , and Cd 1 L 1 , Cd 2 L 1 , and Cd 3 L 1 for PC 2 , PC 3 , and PC 4 . Other approaches used were also limited to LMW cadmium complexes of GSH and PCs, such as potentiometric pH titration [16], UV spectroscopy [17], NMR spectroscopy [18], and differential pulse voltammetry/polarography [15, 16, 19]. …”