Güler SOMER, Ümmihan Taşkoparan YILMAZ

Polarographic determination of anticancer drug vitamin $K _3$ with direct and indirect methods/application to serum and $K _3$ injection solution

In this work, direct and indirect methods for determination of vitamin $K _3$ were developed using differential pulse polarography. The reaction between sulfite and the quinone (Q) form of vitamin $K _3$ was used for indirect determination, since the sulfite peak at -0.7 V is sharp and very reproducible in 0.1 M HAc NaAc (pH = 5.5). It was found that at pH 4.5-5.5, this reaction was quantitative and very fast when the temperature was 45 $^o C$. For its direct determination, on the other hand, vitamin $K _3$ was standardized by the indirect method using standard sulfite as the reducing agent. The calibration graph for vitamin $K _3$ (in Q form), using the peak at -1.0 V in a HAc-NaAc medium with a pH of 5.5, was linear for concentrations ranging from 5 × $10^ {-7}$ to 3 × $10^ {-5}$ M, and the limit of detection (LOD) was 1.5 × $10^ {-7}$ M. The proposed methods were successfully applied to the determination of vitamin $K _3$ in a clinical injection solution and in blood serum.

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