Pre-concentration of Penicillamine using Fe3O4NPS and analysis of it in drug formulations through spectroscopic method

First, an effective pre-concentration of penicillamine was done via Fe3O4NPS. Then, a simple, rapid and sensitive spectrophotometric method is described for the determination of penicillamine by 2, 6-dichlorophenolindophenol (2, 6-DCPIP), as the chromogenic agent in bulk drug and formulations. It produces a bluish green coloured compound with maximum absorbance 610 nm. Beer's law was obeyed in the concentration range 0.005-0.100 ppm with molar absorptivity 1.97 × 103 L/mol/cm and RSD 0.3-0.82%. Statistical comparison of the results with those from the reference method reveals excellent agreement and accuracy and precision was ±0.481 to ±0.33%. This method is also applied on the whole blood and serum samples collected from the confirmed patients. The reaction of penicillamine with 2, 6-DCPIP was confirmed by FTIR and 1H NMR. The main advantage of 2, 6-DCPIP was its stability as a reagent solution, resulting in reliable and reproducible results.