Fitch WL, Khojasteh C, Aliagas I, Johnson K. Using LC Retention Times in Organic Structure Determination: Drug Metabolite Identification.
Drug Metab Lett 2019;
12:93-100. [PMID:
30070179 PMCID:
PMC6350196 DOI:
10.2174/1872312812666180802093347]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 06/13/2018] [Accepted: 07/31/2018] [Indexed: 11/26/2022]
Abstract
Background:
There is a continued need for improvements in the efficiency of metabolite structure elucidation.
Objective:
We propose to take LC Retention Time (RT) into consideration during the process of structure determination.
Methods:
Herein, we develop a simple methodology that employs a Chromatographic Hydrophobicity Index (CHI) framework for standardizing LC conditions and introduce and utilize the concept of a pre-dictable CHI change upon Phase 1 biotransformation (CHIbt). Through the analysis of literature exam-ples, we offer a Quantitative Structure-Retention Relationship (QSRR) for several types of biotransfor-mation (especially hydroxylation) using physicochemical properties (clogP, hydrogen bonding).
Results:
The CHI system for retention indexing is shown to be practical and simple to implement. A da-tabase of CHIbt values has been created from re-incubation of 3 compounds and from analysis of an addi-tional 17 datasets from the literature. Application of this database is illustrated.
Conclusion:
In our experience, this simple methodology allows complementing the discovery efforts that saves resources for in-depth characterization using NMR.
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