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This study presents a scalable continuous flow synthesis for capsaicinoids and demonstrates their enhanced water solubility using cyclodextrin (CD) inclusion complexes. This breakthrough improves applications in pharmaceuticals, food, and agriculture.

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Area of Science:

  • Organic Chemistry
  • Pharmaceutical Sciences
  • Materials Science

Background:

  • Capsaicinoids, known for chili pepper pungency, are valuable in food, pharmaceuticals, and agrochemicals.
  • Poor aqueous solubility of capsaicinoids limits their wider application and formulation development.

Purpose of the Study:

  • To develop a pilot-scale continuous flow synthesis for key capsaicinoids.
  • To enhance the aqueous solubility of capsaicinoids through cyclodextrin complexation.

Main Methods:

  • Continuous flow synthesis involving oxime formation, hydrogenation, and N-acylation.
  • Systematic investigation of inclusion complex formation with various alpha- and beta-cyclodextrin (CD) derivatives.
  • Phase-solubility analyses, stability constant determinations, and 1D/2D NMR spectroscopy.

Main Results:

  • Successful pilot-scale continuous flow synthesis of capsaicin, dihydrocapsaicin, and nonivamide.
  • Demonstrated significant increase in aqueous solubility of capsaicinoids via CD complexation.
  • Confirmed 1:1 host-guest stoichiometry and identified key intermolecular interactions using NMR.

Conclusions:

  • A scalable synthetic route and effective formulation strategy for capsaicinoids have been established.
  • Enhanced aqueous solubility via CD complexation is crucial for pharmaceutical, food, and agricultural applications.
  • This work addresses critical challenges in handling and formulating potentially irritant capsaicinoid compounds.