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The use of a temperature-responsive column for the direct analysis of drugs in serum by two-dimensional heart-cutting liquid chromatography

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Abstract

A novel pretreatment method, which was performed using a two-dimensional high-performance liquid chromatography (2D-HPLC) system, was proposed for the direct analysis of drugs in human serum. A temperature-responsive column was used as a pretreatment column. The stationary phase of the temperature-responsive column exhibits temperature-regulated hydrophilic/hydrophobic characteristics. Controlling the ionic strength of the eluent enables human serum albumin (HSA) to pass through the column without retention. When serum samples containing barbiturates or benzodiazepines were injected into the temperature-responsive column using 10 mM of ammonium acetate (pH 6.5) as the mobile phase and in the temperature range of 10–40 °C, HSA was eluted from the column near the dead time, followed by the individual drugs. When the column temperature was changed, the retention times of the drugs were altered owing to surface property changes within the pretreatment column. These closely eluted compounds were subsequently introduced into the analytical column using a column-switching valve, with a minimal gap time to avoid foreign substance contamination. This new 2D-HPLC method afforded high-quality chromatograms of multiple drugs without unwanted peaks from foreign substances. The present technique could be an attractive choice in selecting the analytical method for drug analysis.

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Acknowledgments

The authors appreciate Hitachi High-Technologies Corporation for providing valuable information. This study was supported in part by a Grant-in-Aid for Scientific Research (B) (Grant No. 21390012 and 25293009) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Authors and Affiliations

  1. Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen, Minato, Tokyo, 105-8512, Japan

    Toshiyasu Mikuma, Ryo Uchida, Mizuki Kajiya, Yuki Hiruta & Hideko Kanazawa

  2. Forensic Science Laboratory, Chiba Prefectural Police H.Q., 1-71-1, Chuoko, Chuo, Chiba-city, Chiba, 260-0024, Japan

    Toshiyasu Mikuma

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  1. Toshiyasu Mikuma
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  2. Ryo Uchida
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  3. Mizuki Kajiya
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  4. Yuki Hiruta
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  5. Hideko Kanazawa
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Correspondence to Hideko Kanazawa.

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Mikuma, T., Uchida, R., Kajiya, M. et al. The use of a temperature-responsive column for the direct analysis of drugs in serum by two-dimensional heart-cutting liquid chromatography. Anal Bioanal Chem 409, 1059–1065 (2017). https://doi.org/10.1007/s00216-016-0024-9

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  • DOI: https://doi.org/10.1007/s00216-016-0024-9

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