Differential pulse voltammetric determination of methylprednisolone in pharmaceuticals and human biological fluids.
Electrochemical behaviour of methylprednisolone (MP) at the fullerene-C60-modified glassy carbon electrode has been investigated using differential pulse voltammetry. The experimental results suggest that the modified electrode exhibits electrocatalytic effect on the oxidation of MP resulting in a marked enhancement of the peak current response. Under the selected conditions, the oxidation peak current was linearly dependent on the concentration of MP in the range 5.0 nM-1.0 microM with a sensitivity of 0.0107 microA microM(-1). The detection limit was estimated to be 5.6 nM. The electrode showed good sensitivity, selectivity, stability and reproducibility. In addition, the developed method was satisfactorily applied to the determination of MP in pharmaceutical formulations and human serum and urine samples without any necessity for sample treatment or time-consuming extraction steps prior to the analysis. GC-MS method was used to cross-validate the results obtained for the quantitative estimation of MP in biological fluids and the results showed approximately 2% deviation to those obtained using the proposed method.
Goyal
Rajendra N
RN
Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India. rngcyfcy@iitr.ernet.in
Bachheti
Neeta
N
Tyagi
Anuradha
A
Pandey
Ashish K
AK
D004563:Electrochemistry; D006801:Humans; D008775:Methylprednisolone / Q000032:analysis / Q000097:blood* / Q000652:urine*; D015394:Molecular Structure; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013997:Time Factors
D004364:Pharmaceutical Preparations; D008775:Methylprednisolone