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<p>Alginic acid is a non-water soluble polyanionic heteropolymer. However, sodium and potassium alginates can form viscous aqueous solutions in water and can easily cross-link with metal cations as Ca<sup>2+</sup> and Fe<sup>3+,</sup> forming gels with different morphologies, like films and capsules. Its combination with inorganic materials, such as laminar clays, allows the development of hybrid composites for the encapsulation of bioactive compounds. In this work, hybrid clay-biopolymer capsules, composed of montmorillonite laminar clay (Mt) and Sodium Alginate (SA), are designed and characterized using Nuclear Magnetic Resonance (NMR) relaxometry techniques. Particularly, <i>Laurus Nobilis</i> essential oil is encapsulated within these capsules. The T<sub>1</sub>-T<sub>2</sub> relaxation maps show the position of each proton population: hydroxyls from the clay, confined water in the clay and the polymer matrix, and oil (confined in the polymer matrix and between the granules of the clay). The hydration-dependent behavior of Mt and SA is analyzed, and T<sub>1</sub>-T<sub>2</sub> relaxation maps further reveal how water and oil penetration into the matrix correlates with the clay content in the sample. Additionally, the results demonstrated a linear relationship between the basal spacing (d001) and the relative humidity of the samples. </p>

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Confinement of Laurus nobilis Essential Oil in Clay-Alginate Composites: Insights from T1-T2 Relaxation Maps

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Ayelén F. Crespi,
  • Mariela A. Fernández,
  • Francisco Turri,
  • Hernán Bach,
  • Paola Di Leo Lira,
  • Daiana Retta,
  • Valeria Moscatelli,
  • Gustavo A. Monti,
  • Yamila Garro-Linck

摘要

Alginic acid is a non-water soluble polyanionic heteropolymer. However, sodium and potassium alginates can form viscous aqueous solutions in water and can easily cross-link with metal cations as Ca2+ and Fe3+, forming gels with different morphologies, like films and capsules. Its combination with inorganic materials, such as laminar clays, allows the development of hybrid composites for the encapsulation of bioactive compounds. In this work, hybrid clay-biopolymer capsules, composed of montmorillonite laminar clay (Mt) and Sodium Alginate (SA), are designed and characterized using Nuclear Magnetic Resonance (NMR) relaxometry techniques. Particularly, Laurus Nobilis essential oil is encapsulated within these capsules. The T1-T2 relaxation maps show the position of each proton population: hydroxyls from the clay, confined water in the clay and the polymer matrix, and oil (confined in the polymer matrix and between the granules of the clay). The hydration-dependent behavior of Mt and SA is analyzed, and T1-T2 relaxation maps further reveal how water and oil penetration into the matrix correlates with the clay content in the sample. Additionally, the results demonstrated a linear relationship between the basal spacing (d001) and the relative humidity of the samples.