Coaxial Electrospinning for Targeted Drug Delivery in Wound Dressings

Exploring core-shell nanofibers as adaptable platforms for localized care

A wound dressing can do more than cover an injury. Researchers are exploring materials that manage moisture, provide a protective structure, and deliver an active compound where it is needed. Coaxial electrospinning offers an unusually flexible way to investigate that idea.

Instead of producing a fiber from one uniform solution, coaxial electrospinning feeds two liquids through concentric channels. Under a strong electric field, the combined jet can form a fiber with a core surrounded by a different sheath. That simple structural change creates new possibilities for separating materials, protecting sensitive ingredients, and shaping how a compound is released. ^[1]

Research status: Coaxial electrospun wound dressings are an active research area. A laboratory fiber mat is not a medical product. Biocompatibility, dose, release behavior, sterility, stability, manufacturing controls, and regulatory requirements must all be established for any intended clinical use.

Why a core-shell fiber is interesting

In a conventional blended fiber, the polymer and active ingredient occupy the same solution. That approach can be useful, but the active material may migrate to the surface, interact with the solvent, or release rapidly when the fiber becomes wet.

A core-shell structure gives the researcher another design dimension:

• The core can carry a drug, protein, signaling molecule, oil, or other active material.
• The sheath can provide mechanical support, control exposure to the environment, or influence wetting and release.
• The two layers can use different polymers when their processing conditions are compatible.

The result is not automatically “controlled release.” It is a platform in which release can potentially be tuned through material choice, layer thickness, porosity, degradation, swelling, and fiber geometry. Reviews of core-shell nanofibers describe their ability to reduce initial burst release and protect encapsulated materials, while also emphasizing the development work still required. ^{[1, 2]}

A wound dressing is a system, not just a fiber

The fiber architecture is only one part of the design. A useful wound-dressing concept may need to balance:

• Breathability and fluid handling.
• Conformability and mechanical integrity.
• Non-adherence or controlled adhesion.
• Compatibility with skin and wound tissue.
• Release of an active compound over an appropriate period.
• Removal without leaving harmful residue.
• Sterilization and shelf stability.

Electrospun mats are attractive because their fine fibers can create a porous, high-surface-area structure. Coaxial spinning adds the possibility of placing different functions in different regions of each fiber.

Possibilities worth exploring

Localized antimicrobial delivery

An antimicrobial compound could be carried in the core while the sheath moderates direct exposure and release. The research question is whether the architecture can maintain useful local availability without an unnecessarily high initial dose.

Protection of sensitive compounds

Proteins, peptides, enzymes, or natural compounds may be sensitive to light, oxygen, moisture, or direct contact with a surrounding environment. Encapsulation may offer temporary protection, provided the fabrication solvents and electric field do not damage the active material.

Sequential or responsive release

The sheath could provide an early surface function while the core supplies a later response. Alternatively, a material that swells or degrades in a wound-like environment could expose the core progressively. These concepts require measurement rather than assumption, but coaxial fibers make them physically plausible.

Combining structure and therapy

One polymer can be selected primarily for spinnability and strength while another supports the intended biological interaction. This division of roles can be more flexible than asking one material to do everything.

Where SpinSpray Lab 30 Coaxial fits

SpinSpray Lab 30 Coaxial brings the main experimental elements into one benchtop platform: two controlled fluid-delivery channels, a coaxial spinneret, regulated high voltage up to +30 kV, and a rotating collector.

That architecture lets a research team explore questions such as:

• Which core and sheath combinations form a stable compound jet?
• Does changing the flow-rate ratio alter the shell thickness or fiber morphology?
• Can an active ingredient remain concentrated in the core?
• How do voltage, working distance, and collection conditions affect the mat?
• Does the resulting structure change release behavior compared with a blended fiber?

The value of an adjustable system is not that one setting solves every formulation. It is that voltage, two flow rates, and collection can be changed deliberately while the material response is observed.

A sensible exploration path

Start with materials that are safe to handle and easy to detect rather than beginning with a therapeutic compound.

1. Establish a stable sheath-only electrospinning process.
2. Add a compatible core liquid containing a visible dye or benign marker.
3. Confirm that a reproducible compound Taylor cone forms.
4. Examine fiber morphology and verify a core-shell structure with suitable microscopy.
5. Measure marker release into a simple test medium.
6. Compare the coaxial fiber with a blended or single-fluid control.

Only after the physical platform is understood should a research program move toward valuable or sensitive active materials. This staged approach separates “Can we make the structure?” from “Does the structure perform the intended biological function?”

What would make the result convincing?

A web-like mat alone does not establish successful encapsulation or targeted delivery. Useful evidence could include:

• Microscopy showing consistent fibers and a core-shell cross-section.
• Chemical mapping that locates the active material.
• Encapsulation-efficiency and loading measurements.
• Release profiles under relevant conditions.
• Mechanical, wetting, and fluid-handling tests.
• Cytocompatibility and application-specific biological studies.
• Sterilization and aging studies for later-stage development.

Safety and development boundaries

Coaxial electrospinning can combine high voltage, moving equipment, fine aerosols, biologically active compounds, and solvents that may be toxic or flammable. Use an enclosed, ventilated apparatus and an approved chemical and electrical procedure. Review the safety data for every ingredient and consider both core and sheath solvents together.

Do not describe an experimental mat as sterile, biocompatible, antimicrobial, controlled-release, or suitable for wound contact until the corresponding property has been measured with an appropriate method.

A platform for discovery

The excitement of coaxial electrospinning is not a single wound-dressing recipe. It is the ability to build function into the cross-section of a fiber. A sheath can provide one set of properties while a protected core provides another, creating a small but remarkably versatile materials platform.

For researchers ready to move beyond single-fluid electrospinning, SpinSpray Lab 30 Coaxial offers a practical way to begin asking those questions. See Electrospinning Fundamentals and Electrospinning Machine Comparison for related guidance.

References

1. B. Pant et al., “Drug Delivery Applications of Core-Sheath Nanofibers Prepared by Coaxial Electrospinning: A Review,” Pharmaceutics 11, no. 7 (2019): 305. https://pmc.ncbi.nlm.nih.gov/articles/PMC6680404/
2. “Recent Advances in Coaxial Electrospun Nanofibers for Wound Healing,” open-access review. https://pmc.ncbi.nlm.nih.gov/articles/PMC11570975/