Potential of High-Performance Liquid Chromatography for Distribution Coefficient Determination of 3-Hydroxyquinolin-4(1H)-one Derivatives

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• 作者：Tereza Volná ; Kamil Motyka ; Jan Hlaváč
• 关键词：Liquid chromatography ; Distribution coefficient ; Lipophilicity ; 3 ; Hydroxyquinolin ; 4(1H) ; ones
• 刊名：Chromatographia
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：79
• 期：17-18
• 页码：1153-1163
• 全文大小：894 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Organic Chemistry
  Pharmacy
  Biochemistry
  Plant Sciences
  Measurement Science and Instrumentation
  
• 出版者：Vieweg Verlag
• ISSN：1612-1112
• 卷排序：79

文摘

The potential of reversed-phase HPLC for the determination of distribution coefficient D_7.4 of selected 3-hydroxyquinolin-4(1H)-ones (3HQs) as compounds with significant biological activity was studied. Various stationary phases with C18 as well as hexyl-phenyl modification reflect current trends in RP-HPLC development such as higher sorbent silanophilicity, core–shell technology, hybrid and/or charged surface particles. Because of significant peak tailing of 3HQs at physiological pH on reversed-phase sorbents the separations at pH 3 were performed as well. Surprisingly, the pH change did not affect significantly the partition coefficients of 3HQs. Very affordable and common standards such as anisole, acetophenone, benzyl alcohol, brombenzene, ethylbenzoate and trichlorethylene were applied in the described methodology. The best linearity (R2 0.9895) of the correlation between log P and log k_w for standards was obtained for hexyl-phenyl sorbent, but this stationary phase was shown to be unsuitable for HPLC separation of 3HQs. The highest linearity (R2 0.9499) of the relationship between log D_7.4 determined by the classic shake-flask method and log D determined by means of HPLC for 3HQs was attained with Cortecs C18+ column at pH 7.4. The described methodology with Cortecs C18+ as stationary phase offers fast and accurate estimation of log D_7.4 of the tested 3HQs. In an effort to increase the throughput of the HPLC method for log D_7.4 determination, we evaluated almost aqueous mobile phase that contained only 3 % of acetonitrile. Although a worse correlation between log D_7.4 determined by shake-flask method and HPLC with almost aqueous mobile phase was observed, the described procedure offers a very simple and high-throughput alternative for the estimation of log D_7.4.