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Identification of Impurities in 5-Aminolevulinic Acid by Two-Dimensional Column-Switching Liquid Chromatography Coupled with Linear Ion Trap Mass Spectrometry

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Abstract

Identification of impurities in 5-aminolevulinic acid (ALA) by mass spectrometry is difficult, because MS-incompatible mobile phases, such as phosphate buffers or ion-pair reagents, need to be used to separate the major component from impurities. In this study, the unknown impurities in ALA have been identified by two-dimensional (2D) column-switching high-performance liquid chromatography (HPLC) coupled with linear ion trap mass spectrometry (LIT MS). The first-dimensional analytical column was a Gemini C18 (150 mm × 4.6 mm, 5 μm) with a non-volatile salt mobile phase at a flow rate of 1.0 mL min−1, and the second-dimensional analytical column was a ZORBAX SB C8 (150 mm × 4.6 mm, 3.5 μm) with a volatile salt mobile phase at a flow rate of 1.0 mL min−1. The detection wavelength was 205 nm. Mass spectra were acquired with an ESI source, in both positive and negative ion modes. Six impurities were identified by their MS2 and MS3 fragments, and the mass fragmentation patterns and structural assignments of these impurities were studied. The results obtained by the two-dimensional column-switching method were further compared with those of the conventional one-dimensional normal-phase HPLC–MS using an amide column and an MS-compatible mobile phase for separation. The two-dimensional column-switching method described herein proved to be advantageous in terms of the number of impurities identified. The column-switching and online demineralization technique made the mobile phase conditions compatible with mass spectrometry. Thus, the method solves the problem of incompatibility between non-volatile salt mobile phases and mass spectrometry, making it worthy of popularization and application in impurity identification.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 21405104) and the Youth Initial Foundation of Shanghai Jiao Tong University.

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  1. Instrumental Analysis Center, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, 200240, People’s Republic of China

    Hang Wang & Sijun Xie

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  1. Hang Wang
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  2. Sijun Xie
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Correspondence to Hang Wang.

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Wang, H., Xie, S. Identification of Impurities in 5-Aminolevulinic Acid by Two-Dimensional Column-Switching Liquid Chromatography Coupled with Linear Ion Trap Mass Spectrometry. Chromatographia 79, 1469–1478 (2016). https://doi.org/10.1007/s10337-016-3165-2

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