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Rapid and sensitive analysis of 27 underivatized free amino acids, dipeptides, and tripeptides in fruits of Siraitia grosvenorii Swingle using HILIC-UHPLC-QTRAP®/MS2 combined with chemometrics methods

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Abstract

In the present study, a new strategy based on chemical analysis and chemometrics methods was proposed for the comprehensive analysis and profiling of underivatized free amino acids (FAAs) and small peptides among various Luo-Han-Guo (LHG) samples. Firstly, the ultrasound-assisted extraction (UAE) parameters were optimized using Plackett–Burman (PB) screening and Box–Behnken designs (BBD), and the following optimal UAE conditions were obtained: ultrasound power of 280 W, extraction time of 43 min, and the solid–liquid ratio of 302 mL/g. Secondly, a rapid and sensitive analytical method was developed for simultaneous quantification of 24 FAAs and 3 active small peptides in LHG at trace levels using hydrophilic interaction ultra-performance liquid chromatography coupled with triple–quadrupole linear ion-trap tandem mass spectrometry (HILIC-UHPLC-QTRAP®/MS2). The analytical method was validated by matrix effects, linearity, LODs, LOQs, precision, repeatability, stability, and recovery. Thirdly, the proposed optimal UAE conditions and analytical methods were applied to measurement of LHG samples. It was shown that LHG was rich in essential amino acids, which were beneficial nutrient substances for human health. Finally, based on the contents of the 27 analytes, the chemometrics methods of unsupervised principal component analysis (PCA) and supervised counter propagation artificial neural network (CP-ANN) were applied to differentiate and classify the 40 batches of LHG samples from different cultivated forms, regions, and varieties. As a result, these samples were mainly clustered into three clusters, which illustrated the cultivating disparity among the samples. In summary, the presented strategy had potential for the investigation of edible plants and agricultural products containing FAAs and small peptides.

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Acknowledgments

We are pleased to thank Dr. Bin Hao (School of Pharmacy, Shanghai Jiao Tong University) for the help in HILIC-UHPLC-QTRAP®/MS2 tests.

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The authors have no conflicts of interest.

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Authors and Affiliations

  1. School of Pharmacy, Shanghai Jiao Tong University, Shanghai, 200240, China

    Guisheng Zhou, Mengyue Wang, Yang Li, Ying Peng & Xiaobo Li

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  1. Guisheng Zhou
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  2. Mengyue Wang
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  3. Yang Li
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  5. Xiaobo Li
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Correspondence to Xiaobo Li.

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Zhou, G., Wang, M., Li, Y. et al. Rapid and sensitive analysis of 27 underivatized free amino acids, dipeptides, and tripeptides in fruits of Siraitia grosvenorii Swingle using HILIC-UHPLC-QTRAP®/MS2 combined with chemometrics methods. Amino Acids 47, 1589–1603 (2015). https://doi.org/10.1007/s00726-015-2002-5

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