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LC-Fluorescence Detection Analysis of Amino Acids from Stellera chamaejasme L. Using 2-[2-(Dibenzocarbazole)-ethoxy] Ethyl Chloroformate as Labeling Reagent

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Abstract

A pre-column derivatization method for the sensitive determination of amino acids using the tagging reagent 2-[2-(dibenzocarbazole)-ethoxy] ethyl chloroformate (DBCEC) followed by liquid chromatography with fluorescence detection has been developed. Identification of DBCEC-amino acids derivatives was by liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS–MS). DBCEC can easily and quickly label amino acids, and derivatives are stable enough to be efficiently analyzed by LC. Separation of the derivatized amino acids had been optimized on Hypersil BDS C18 column. A perfect baseline separation for 20 amino acid derivatives was achieved with a ternary gradient elution program. The chromophore of dibenzocarbazole group, which comprise a large rigid planar structure with p–π conjugation system, resulted in a sensitive fluorescence detection for amino acid derivatives. The derivatized amino acids were detected with fluorescence detector with excitation maximum and emission maximum at 300 and 390 nm, respectively. Excellent linear responses were observed with coefficients of >0.9993, and detection limits were in the range of 0.78–5.13 fmol (signal-to-noise ratio of 3). The mean accuracy ranged from 83.4 to 98.7% for fluorescence detection. The mean inter-day precision for all standards was <4.2% of the expected concentration. Therefore, the proposed method was a highly sensitive and specific method for the quantitative analysis of amino acids from biological and natural environmental samples.

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Acknowledgments

This work was supported by the National Science Foundation of China (No. 20075016) and supported by 100 Talents Program of the Chinese Academy of Sciences (No. 328).

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Authors and Affiliations

  1. Northwest Plateau Institute of Biology, Chinese Academy of Science, Xining, People’s Republic of China

    Zhiwei Sun & Jinmao You

  2. Shandong Provincial Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu, People’s Republic of China

    Jinmao You & Cuihua Song

  3. Graduate University of the Chinese Academy of Science, Beijing, People’s Republic of China

    Zhiwei Sun

Authors
  1. Zhiwei Sun
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  2. Jinmao You
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  3. Cuihua Song
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Correspondence to Jinmao You.

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Sun, Z., You, J. & Song, C. LC-Fluorescence Detection Analysis of Amino Acids from Stellera chamaejasme L. Using 2-[2-(Dibenzocarbazole)-ethoxy] Ethyl Chloroformate as Labeling Reagent. Chroma 72, 641–649 (2010). https://doi.org/10.1365/s10337-010-1706-7

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  • DOI: https://doi.org/10.1365/s10337-010-1706-7

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