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HPLC for stress‐free screening of potential prostate cancer marker catechol estrogens in urine using a diamond‐electrode electrochemical and a fluorescence detector
Author(s) -
Katayama Masatoki,
Takamatsu Kiyoshi,
Kaneko Satoru,
Miyaji Keisuke,
Ishikawa Hiromichi,
Matsuda Yoshifumi
Publication year - 2007
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200700096
Subject(s) - chemistry , catechol , chromatography , urine , prostate cancer , electrochemistry , fluorescence , electrode , detector , analytical chemistry (journal) , cancer , medicine , biochemistry , optics , physics
Improvement of the sensitivity and specificity of a simultaneous stress‐free screening method for catechol estrogens as a potential prostate cancer marker in urine has been accomplished by HPLC with a diamond‐electrode electrochemical detector and a fluorescence detector. Since taking urine samples generates less stress (or pain) than the drawing of blood, the method can readily be applied to almost any patient, and will also assist in improving the sensitivity and specificity of the prostatic specific antigen test. Catechol estrogens (2‐hydroxyestrone, 4‐hydroxyestrone, 2‐methoxyestrone, 2‐hydroxyestradiol, 4‐hydroxyestradiol, 2‐methoxyestradiol, and 2‐hydroxyestriol) and estrogens (estrone, estradiol, estriol) were separated on an Inertsil ODS‐II column with acetonitrile–potassium dihydrogen phosphate (pH 3.0). The diamond‐electrode electrochemical detector used had the great advantage of being a maintenance‐free system, and could sequentially analyze hundreds of samples. Fluorescence detection improved the sensitivity 10–500 times ( e. g. , the LOD of 2‐hydroxyestriol was improved 250 times) compared to previous electrochemical detection reports, and dual detection improved peak identification in the urine samples. The proposed method was applied to the simultaneous determination of catechol estrogens in spiked urine in a preliminary study on estrogens and PSA values in biopsy and prostate cancer patients.