Frontiers in Plant Science (Oct 2024)

Terahertz spectroscopy study of oridonin and ponicidin in the anticancer Chinese herbal medicine Rabdosia rubescens

  • Yang Gao,
  • Yang Gao,
  • Yang Gao,
  • Yang Gao,
  • Zhuang Peng,
  • Zhuang Peng,
  • Zhuang Peng,
  • Zhuang Peng,
  • Huiyu Yang,
  • Huiyu Yang,
  • Huiyu Yang,
  • Huiyu Yang,
  • Xinrui Zhang,
  • Xinrui Zhang,
  • Xinrui Zhang,
  • Xinrui Zhang,
  • Yuhan Zhao,
  • Yuhan Zhao,
  • Yuhan Zhao,
  • Yuhan Zhao,
  • Zeyu Hou,
  • Zeyu Hou,
  • Zeyu Hou,
  • Zeyu Hou,
  • Bo Su,
  • Bo Su,
  • Bo Su,
  • Bo Su,
  • Kai Li,
  • Kai Li,
  • Kai Li,
  • Cunlin Zhang,
  • Cunlin Zhang,
  • Cunlin Zhang

DOI
https://doi.org/10.3389/fpls.2024.1460123
Journal volume & issue
Vol. 15

Abstract

Read online

Rabdosia rubescens, a Chinese herbal medicine with anticancer properties, contains two active ingredients: oridonin and ponicidin. Both compounds exhibit antitumor effects by inducing tumor cell apoptosis and autophagy and inhibiting tumor cell proliferation. To further explore the differences in molecular structure and pharmacological properties between the two substances, this study employs Terahertz Time-Domain Spectroscopy (THz-TDS) to investigate the spectral characteristics of oridonin and ponicidin in the frequency range of 0.1 to 2.3 THz. The crystal structures of the two substances are simulated using Materials Studio software and Density Functional Theory (DFT), yielding their spectra and molecular vibration modes, which elucidate the mechanism underlying the peak generation. The consistency between experimental and simulation results confirms the reliability of the experimental findings. Thus, THz spectroscopy can effectively distinguish between these two substances. Finally, a THz detection is performed on Rabdosia rubescens capsules purchased from the market, revealing the presence of absorption peaks for both substances in their absorption spectra. This provides a new approach for detecting active ingredients in Chinese herbal medicines.

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