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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

387
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
387

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Updated: May 8, 2025

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Alkaloids from cigar.

Qing-Yang Wu1,2,3, Guang-Hai Zhang1, Feng Wei2

  • 1Yunnan Academy of Tobacco Agricultural Sciences, Kunming 650021, China.

Journal of Asian Natural Products Research
|March 20, 2025
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Summary

This study identified novel dimeric nicotine analogs and other alkaloids in cigar tobacco, revealing key chemical differences from other tobacco types. Molecular docking showed potential interactions with the nicotinic acetylcholine receptor.

Keywords:
Cigar tobaccoalkaloidscigatobines A-Bnicotine dimerα7-nAChR receptor

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Area of Science:

  • Natural Product Chemistry
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Tobacco plants are a rich source of alkaloids with diverse pharmacological activities.
  • Understanding the specific alkaloid profiles of different tobacco varieties, like cigar tobacco, is crucial for assessing their biological effects.

Purpose of the Study:

  • To conduct a comprehensive phytochemical investigation of cigar tobacco.
  • To identify and characterize novel alkaloids and natural products present in cigar tobacco.
  • To explore the potential interactions of these alkaloids with the alpha-7 nicotinic acetylcholine receptor (α7-nAChR).

Main Methods:

  • Phytochemical analysis of cigar tobacco using advanced isolation and identification techniques.
  • Chemical synthesis elucidation involving Minisci and nucleophilic addition reactions for alkaloid formation.
  • Molecular docking simulations to assess binding affinities of identified alkaloids with the α7-nAChR.

Main Results:

  • Identification of 16 alkaloids, including two new nicotine dimeric analogs (cigatobines A-B) and four new natural products.
  • Elucidation of chemical mechanisms, such as the Minisci reaction, in the formation of dimeric nicotine derivatives.
  • Molecular docking revealed significant binding affinities for several compounds, including cigatobine B (-8.077) and nicotine (-7.805), with the α7-nAChR.

Conclusions:

  • Cigar tobacco possesses a distinct alkaloid profile compared to other tobacco types.
  • The newly identified compounds, cigatobines A-B, represent novel structural classes of nicotine analogs.
  • The study provides insights into the potential pharmacological relevance of cigar tobacco alkaloids through their interaction with the α7-nAChR.