In the present work a gold modified pencil graphite electrode (GPGE) was used for the determination of insulin present in the pharmaceutical sample. Cresol, an electroactive phenolic compound present in insulin pharmaceutical sample which interfere for the detection of insulin. In this paper, the removal of cresol from dialysis process, than obtained solution was freeze dried, followed by detection of insulin by electrophoresis and differential pulse voltammetric (DPV) studies were achieved. The proposed method was applied for the determination of insulin in pharmaceutical sample.
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