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Liquid-core nanocellulose-shell capsules with tunable oxygen permeability.

A J Svagan1, C Bender Koch2, M S Hedenqvist3

  • 1University of Copenhagen, Dept. of Pharmacy, Universitetsparken 2, 2100 Copenhagen, Denmark.

Carbohydrate Polymers
|November 18, 2015
PubMed
Summary
This summary is machine-generated.

Nanocellulose capsules effectively protect oxygen-sensitive ingredients, enhancing shelf-life in food and pharmaceuticals. These capsules significantly reduce oxygen uptake compared to unprotected solutions.

Keywords:
Cellulose nanocrystalsElectron spin resonanceLiquid-core capsulesLow oxygen permeabilityNanofibrillated celluloseOximetry

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials

Background:

  • Oxygen-sensitive components require protection to prevent degradation and extend shelf-life, particularly in food and pharmaceutical applications.
  • Nanocellulose films exhibit excellent oxygen barrier properties, making them promising for encapsulation applications.
  • Developing effective encapsulation strategies is crucial for preserving sensitive materials.

Purpose of the Study:

  • To prepare and characterize nanocellulose-based capsules for encapsulating oxygen-sensitive materials.
  • To quantify the oxygen barrier performance of these nanocellulose capsules.
  • To investigate the oxygen diffusion mechanisms within the capsule walls.

Main Methods:

  • Synthesis of primary nanocellulose polyurea-urethane capsules and aggregate capsules with liquid hexadecane cores.
  • Utilizing oxygen-sensitive spin probes and electron spin resonance (ESR) spectroscopy for non-invasive oxygen concentration measurements.
  • Mathematical modeling of oxygen transport to determine diffusion coefficients through the capsule walls.

Main Results:

  • Both primary and aggregate nanocellulose capsules demonstrated significantly reduced oxygen uptake rates compared to neat hexadecane.
  • The aggregate capsules showed a more pronounced reduction in oxygen uptake (one-ninth) compared to primary capsules (one-third).
  • Determined oxygen diffusion coefficients were lower than anticipated, suggesting potential underestimation by ESR under slow diffusion conditions.

Conclusions:

  • Nanocellulose-based capsules provide effective protection against oxygen, offering a viable solution for enhancing the stability of sensitive ingredients.
  • The structural arrangement (primary vs. aggregate) influences the oxygen barrier performance, with aggregates offering superior protection.
  • Further refinement of measurement techniques may be needed to accurately assess oxygen diffusion in systems with very slow transport rates.