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Combination of Microstereolithography and Electrospinning to Produce Membranes Equipped with Niches for Corneal Regeneration

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Pullulan-alginate fibers produced using free surface electrospinning.

Qian Xiao¹, Loong-Tak Lim²

¹School of Food Science and Technology, Hunan Agricultural University, Hunan 410128, China; Department of Food Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.

International Journal of Biological Macromolecules

|February 8, 2018

Summary

Researchers developed edible ultrafine fibers using pullulan and alginate. Adding calcium chloride (CaCl2) further refined these fibers, creating smooth, nano-scale materials suitable for food and pharmaceutical uses.

Keywords:

Alginate Aqueous-based solution Calcium chloride Electrospun fibers Pullulan

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Area of Science:

Materials Science
Biotechnology
Polymer Chemistry

Background:

Traditional electrospinning often uses organic solvents and synthetic polymers.
Developing safe, water-based alternatives is crucial for food and pharmaceutical applications.

Purpose of the Study:

To investigate the electrospinning of pullulan-alginate ultrafine fibers from aqueous solutions.
To evaluate the effect of calcium chloride (CaCl2) on fiber morphology and properties.
To explore the potential of these edible biopolymer fibers for various applications.

Main Methods:

Free-surface electrospinning of aqueous pullulan and pullulan-alginate solutions.
Characterization of fiber diameter, morphology, and thermal stability.
Systematic variation of alginate and CaCl2 concentrations.

Main Results:

Aqueous pullulan alone produced beaded fibers.
Addition of alginate (0.8-1.6%) yielded continuous, smooth fibers (57-87 nm).
Trace CaCl2 (up to 0.045%) resulted in smaller, smoother fibers with enhanced thermal stability.

Conclusions:

Alginate addition enhances fiber formation through increased entanglement and hydrogen bonding.
CaCl2 significantly improves fiber quality and thermal properties.
Water-based, edible pullulan-alginate fibers offer a promising alternative for nano-scale fiber production in food, nutraceutical, and pharmaceutical industries.