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Cyclodextrin-based Schiff base pro-fragrances: Synthesis and release studies.

Attila Palágyi1, Jindřich Jindřich1, Juraj Dian2,3

  • 1Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, CZ-128 43 Prague, Czech Republic.

Beilstein Journal of Organic Chemistry
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create cyclodextrin derivatives that release volatile aldehydes. The release rate depends significantly on pH and humidity, offering controlled fragrance delivery.

Keywords:
Schiff basealdehydecontrolled releasecyclodextriniminekineticspro-fragrance

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Cyclodextrins are versatile hosts with tunable properties.
  • Controlled release of volatile compounds is crucial for fragrance and flavor applications.
  • Imine bonds offer a cleavable linkage for pro-fragrance design.

Purpose of the Study:

  • To develop a facile method for synthesizing β-cyclodextrin derivatives with covalently bonded volatile aldehydes.
  • To investigate the release kinetics of various aldehydes from these derivatives under different environmental conditions.
  • To establish the influence of pH and humidity on the stability and release rate of the pro-fragrances.

Main Methods:

  • Synthesis of 6I-amino-6I-deoxy-β-cyclodextrin derivatives via imine bond formation with volatile aldehydes.
  • Characterization of synthesized derivatives.
  • Quantification of aldehyde release using 1H NMR spectroscopy and static headspace-gas chromatography.
  • Evaluation of environmental factors (solvent, pH, humidity) on release rates.

Main Results:

  • A series of β-cyclodextrin-aldehyde conjugates were successfully prepared using volatile aldehydes like benzaldehyde, heptanal, and 5-methylfurfural.
  • The release rate of volatile aldehydes was found to be highly dependent on the solution pH.
  • Aldehyde release from the solid state was significantly influenced by air humidity.

Conclusions:

  • The developed imine linkage provides a robust yet cleavable connection for creating cyclodextrin-based pro-fragrances.
  • Environmental factors such as pH and humidity play a critical role in modulating the release of volatile compounds.
  • This approach offers potential for designing advanced fragrance delivery systems with controlled release characteristics.