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Multistimuli-Responsive Pickering Emulsion Stabilized by Se-Containing Surfactant-Modified Chitosan.
Xiaofei Ren1, Shuai He2, Deqiong Liu1
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, People's Republic of China.
Journal of Agricultural and Food Chemistry
|March 19, 2020
Summary
This study introduces a novel biomass-based Pickering emulsion stabilized by modified chitosan and a selenium-containing surfactant. This emulsion exhibits reversible, multi-stimuli responsiveness to redox, ions, and pH, offering potential for functional ingredient delivery.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Biotechnology
Background:
- Particle-stabilized Pickering emulsions offer tunable stability.
- Biomass-based emulsions responding to multiple stimuli are rare.
- Chitosan is a versatile biopolymer for emulsion stabilization.
Purpose of the Study:
- To develop a novel, multi-stimuli-responsive Pickering emulsion using modified chitosan.
- To investigate the stabilization mechanism and stimuli-responsive behaviors.
- To explore its potential as a delivery vehicle for functional ingredients.
Main Methods:
- Modification of chitosan and synthesis of sodium 11-(butylselenyl)undecylsulfate (C4SeC11S).
- Formation of chitosan-C4SeC11S complexes and particles.
- Characterization of Pickering emulsion formation and stability.
- Investigation of responsiveness to redox agents, competitive ions, and pH changes.
Main Results:
- CS-C4SeC11S particles formed stable oil-in-water Pickering emulsions at acidic pH.
- Emulsion destabilization observed upon oxidation, addition of competitive ions (CTAB), or pH changes.
- Unique reversible pH-responsive behavior demonstrated, switching between stable and unstable states.
- Reversible switching of emulsion on/off states achieved using alternating stimuli.
Conclusions:
- A novel, multi-stimuli-responsive Pickering emulsion based on modified chitosan and a selenium-containing surfactant was successfully developed.
- The emulsion exhibits reversible destabilization and stabilization triggered by redox, ionic strength, and pH.
- The unique responsive characteristics suggest potential applications as a smart delivery system for functional ingredients.
