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Effect of layer-by-layer polyelectrolyte method on encapsulation of vanillin.

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  • 1Department of Food Science and Technology, Ferdowsi University of Mashhad, PO Box 91775-1163, Mashhad, Iran.

International Journal of Biological Macromolecules
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Summary

Researchers developed multilayer microcapsules to protect vanillin and control its release. These soy protein isolate, starch, and chitosan microcapsules show great potential for food and pharmaceutical applications.

Keywords:
ChitosanControlled releaseMultilayerOSA-starchSoy protein isolateVanillin

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Area of Science:

  • Food Science and Technology
  • Materials Science
  • Chemical Engineering

Background:

  • Vanillin is a widely used flavoring agent with limited stability and controlled release properties.
  • Microencapsulation is a key technique for protecting sensitive compounds and modulating their release.
  • Multilayer systems offer enhanced barrier properties and controlled release functionalities.

Purpose of the Study:

  • To microencapsulate vanillin using a multilayer emulsion and spray drying technique.
  • To investigate the impact of different layer compositions (one, two, and three layers) on microcapsule properties.
  • To evaluate the protective effects and release characteristics of the developed vanillin microcapsules.

Main Methods:

  • Fabrication of microcapsules using electrostatic layer-by-layer deposition with soy protein isolate, OSA starch, and chitosan.
  • Characterization of microcapsules via scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and analysis of hygroscopicity, solubility, particle size, and encapsulation efficiency.
  • Assessment of vanillin release kinetics in water at 37°C and 80°C.

Main Results:

  • FTIR confirmed successful interaction between the wall materials in the multilayer structures.
  • Microcapsules exhibited low water solubility and hygroscopicity, with three-layer systems showing lower moisture content.
  • Vanillin was effectively protected within the microcapsules, even at elevated temperatures (80°C), demonstrating low release rates.

Conclusions:

  • The multilayer emulsion and spray drying method is effective for vanillin microencapsulation.
  • The developed microcapsules, particularly the three-layer system, offer significant protection and controlled release of vanillin.
  • These microencapsulated vanillin systems hold considerable promise for applications in the food and pharmaceutical industries.