A novel separation method of urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG) was developed. The C(18) and the strong cation-exchange (SCX) columns were employed to separate urinary 8-OHdG. The major interfering substances were removed by the consecutive processes of the C(18) and the SCX columns. This newly developed procedure allows researchers to quantitatively measure urinary 8-OHdG by high performance liquid chromatography-electrochemical detector (HPLC-ECD) successfully. The newly developed separation method produces the optimized procedure of 8-OHdG measurement, and followed by the evaluation of its basic performance. The optimized measurement was highly reproducible (CV=2.0-2.9%, n=10). A correlation was observed between the proposed HPLC-ECD method and the column switching method (r=0.96).
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