Optimization of Emulsification Parameters for Preparing Hydrogel Beads Based on an Enzymatically Cross-Linkable...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Materials Engineering

Background:

• Hydrogel beads are versatile biomaterials with applications in drug delivery and tissue engineering.
• Controlling hydrogel bead size and distribution is crucial for their performance.
• Phenolic hydroxyl-functionalized poly(α,β-[N-(2-hydroxyethyl)-D,L-aspartamide]) (PHEA-HP) offers unique properties for hydrogel formation.

Purpose of the Study:

• To optimize the preparation of PHEA-HP hydrogel beads using an emulsion-enzymatic gelation process.
• To investigate the impact of preparation parameters on hydrogel bead size and size distribution span.
• To determine the optimal emulsification conditions for producing uniform PHEA-HP hydrogel beads.

Main Methods:

• Emulsion-enzymatic gelation process for hydrogel bead preparation.
• Single-factor experiments to establish preparation condition ranges.
• Box-Behnken design with response surface methodology (BBD-RSM) for parameter optimization.
• Analysis of oil-to-water ratio, homogenization rate, and Span 80 dosage effects.

Main Results:

• The size distribution span of hydrogel beads was well-described by a quadratic model.
• Size distribution span was more sensitive to preparation variables than bead size.
• Optimal conditions: oil-to-water ratio of 10.3, homogenization rate of 2930 rpm, and Span 80 dosage of 2.0%.
• Optimized PHEA-HP hydrogel beads were spherical, averaging 14.0 ± 0.2 μm with a span of 0.185 ± 0.010.

Conclusions:

• The BBD-RSM effectively optimized the emulsification parameters for PHEA-HP hydrogel bead preparation.
• Achieved highly uniform and spherical PHEA-HP hydrogel beads with controlled size.
• The optimized process provides a reliable method for producing high-quality hydrogel beads for potential applications.