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Mechanically Enhanced Liquid Interfaces at Human Body Temperature Using Thermosensitive Methylated Nanocrystalline

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Methylated nanocrystalline cellulose (metNCC) forms temperature-sensitive elastic layers at oil/water interfaces. This controlled interfacial change optimizes hydrophobic drug release in lipid-based formulations.

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Area of Science:

  • Materials Science
  • Biopolymers
  • Surface Chemistry

Background:

  • Hydrophobic drug release is influenced by material properties at oil/water interfaces.
  • Nanocrystalline cellulose (NCC) is a promising biopolymer for drug delivery applications.

Purpose of the Study:

  • To develop thermosensitive biopolymers from NCC for controlled interfacial gelation.
  • To investigate the mechanical performance of methylated NCC (metNCC) at oil/water interfaces at body temperature.
  • To optimize lipid-based drug formulations using metNCC's tunable interfacial properties.

Main Methods:

  • Surface methylation of NCC using mercerization and dimethyl sulfate.
  • Interfacial rheology (shear and dilatational) to measure elasticity.
  • Atomic force microscopy (AFM) and neutron reflection to analyze interfacial structure.
  • Thermogelation studies at air/water and MCT/water interfaces.

Main Results:

  • metNCC formed elastic interfacial layers that stiffened significantly at body temperature.
  • Interfacial properties (elasticity, brittleness) were tunable by adjusting metNCC hydrophobicity.
  • Layer thickness and density increased with temperature, indicating enhanced self-assembly.
  • metNCC exhibited more brittle interfacial layers compared to commercial methylcellulose.

Conclusions:

  • Thermosensitive metNCC offers controllable interfacial properties for drug encapsulation.
  • The temperature-dependent structural and mechanical changes are key for optimizing drug release.
  • metNCC presents a novel material for advanced lipid-based drug delivery systems.