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Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release

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Lignocellulose processing-induced pH-responsive Pickering emulsions for curcumin delivery.

Zhibo Zhao¹, Jun Wang¹, Xilong Li¹

¹School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110006, PR China.

Food Research International (Ottawa, Ont.)

|March 12, 2026

Summary

pH-responsive Pickering emulsions were created from plant particles for safe biomaterial delivery. These emulsions offer tunable release and enhanced nutrient bioavailability, demonstrating biocompatibility and sustainability.

Keywords:

Bioaccessibility Curcumin encapsulation Lignocellulose Oil-in-water emulsions pH-responsive

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Area of Science:

Materials Science
Biotechnology
Colloid Chemistry

Background:

pH-responsive Pickering emulsions are crucial for safe delivery systems without synthetic modifications.
Lignocellulose-derived colloidal particles (LCPs) offer a sustainable alternative for emulsion stabilization.

Purpose of the Study:

To develop pH-responsive Pickering emulsions using plant-derived LCPs for targeted nutrient delivery.
To evaluate the stability, responsiveness, and delivery capabilities of these emulsions.

Main Methods:

Lignocellulose-derived colloidal particles (LCPs) were prepared from Bougainvillea spectabilis stems via biorefining.
High-internal-phase Pickering emulsions (HIPPEs) were formed and their pH-responsive behavior was assessed.
Curcumin delivery, release kinetics, bioaccessibility, lipid hydrolysis, and cytotoxicity were evaluated.

Main Results:

LCPs demonstrated pH-responsive emulsification, stabilizing emulsions under alkaline conditions and demulsifying under acidic conditions.
The emulsion system exhibited reversible pH-responsiveness over eight cycles with >95% stability.
Curcumin encapsulation efficiency reached 92.5%, with enhanced bioaccessibility (5.11-fold increase) and promoted lipid hydrolysis (7.15-fold increase).
Cytotoxicity tests confirmed biocompatibility, with cell viability >90% at high LCP concentrations.

Conclusions:

A biorefining pathway was established to create pH-responsive colloidal platforms from underutilized plant resources.
These plant-derived emulsions offer a sustainable and biocompatible solution for targeted nutrient delivery and enhanced bioavailability.