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Non-targeted analysis of vulgarisins by using collisional dissociation mass spectrometry for the discovery of analogues from Prunella vulgaris

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Abstract

Vulgarisins are members of diterpenoids with rare 5/6/4/5 ring skeleton from Prunella vulgaris Linn. (P. vulgaris). Their molecular scaffolds comprise different hydroxylation and degree of esterification. Vulgarisins have attracted many attentions in the fields of food and medicine for their potent bioactivities. Firstly, four reference compounds were analyzed by higher-energy collisional dissociation mass spectrometry (HCD MS/MS) and the fragmentation patterns for molecular scaffold were summarized. And then, a high-performance liquid chromatography/electrospray ionization/high-resolution mass spectrometry (HPLC-ESI-HR-MS) method was adopted to investigate the P. vulgaris extracts. Finally, the proposed analysis results were successfully applied to facilitate the discovery of the vulgarisins analogues from P. vulgaris. For the four reference compounds, the sodium adduct was the predominate ion in full scan. A specific fragmentation pathway of [M+Na]+ ions leads to produce diagnostic ions of vulgarisins at m/z 325 under HCD, which was formed through consecutive-side chains lost. Twenty-three diterpenoids, including 18 vulgarisins analogues, were identified or tentatively characterized in the botanical extracts of P. vulgaris based on their elemental constituents and characteristic fragment ion profiles. Two new vulgarisins analogues in the plant were isolated and their structures were illustrated based on extensive spectroscopic analysis using 1D and 2D nuclear magnetic resonance (NMR) spectroscopy. The HCD MS/MS method, including the profiles of the diagnostic ions induced by characteristic fragmentation, is an effective technique for the discovery of vulgarisins analogues in P. vulgaris. The expected fragmentation pattern knowledge will also facilitate the analysis of other natural products.

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Authors and Affiliations

  1. State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, Guizhou, China

    Fengwei Ma, Huayong Lou, Jinyu Li, Chao Chen, Lei Tang & Weidong Pan

  2. The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Science, Guiyang, 550014, Guizhou, China

    Fengwei Ma, Huayong Lou, Jinyu Li, Chao Chen & Weidong Pan

  3. Food and Pharmaceutical Engineering Institute, Guiyang University, Guiyang, 550005, Guizhou, China

    Fengwei Ma, Yonghui Ge & Su Xu

Authors
  1. Fengwei Ma
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  2. Huayong Lou
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  3. Yonghui Ge
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  4. Jinyu Li
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  5. Chao Chen
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  6. Su Xu
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  7. Lei Tang
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  8. Weidong Pan
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Correspondence to Lei Tang or Weidong Pan.

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Ma, F., Lou, H., Ge, Y. et al. Non-targeted analysis of vulgarisins by using collisional dissociation mass spectrometry for the discovery of analogues from Prunella vulgaris. Anal Bioanal Chem 413, 6513–6521 (2021). https://doi.org/10.1007/s00216-021-03615-x

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  • DOI: https://doi.org/10.1007/s00216-021-03615-x

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