Fabrication of Dissolvable Microneedle Patches Loaded with α-Lactalbumin Nanomicelles for Transdermal Capsaicin Delivery and Adipose Tissue Reduction
December 30th, 2025
This protocol describes the fabrication of dissolvable microneedle patches incorporating α-lactalbumin nanomicelles loaded with capsaicin. The method offers a reproducible, minimally invasive approach for targeted transdermal delivery of hydrophobic bioactives to adipose tissue, facilitating efficient local fat reduction and potentially expanding applications in obesity management.
Overview
This protocol describes the fabrication and application of dissolvable microneedle (MN) patches containing α-lactalbumin nanomicelles for targeted transdermal delivery of capsaicin to adipose tissue. The method enables efficient encapsulation and delivery of hydrophobic bioactives, offering a minimally invasive therapeutic strategy for obesity management.
Key Study Components
Area of Science
- Drug delivery systems
- Biomaterials
- Obesity research
Background
- Transdermal delivery of hydrophobic drugs is challenging due to poor solubility and skin penetration barriers.
- Microneedle patches offer a minimally invasive alternative to traditional delivery methods.
- α-lactalbumin-derived nanomicelles can encapsulate hydrophobic compounds like capsaicin.
- Targeted delivery to adipose tissue may enhance therapeutic outcomes for obesity.
Purpose of Study
- To develop a reproducible protocol for fabricating dissolvable MN patches containing capsaicin-loaded nanomicelles.
- To evaluate the mechanical strength, skin penetration, and drug release of the MNs.
- To assess the in vivo efficacy of the patches in reducing fat mass and promoting adipose browning in a mouse model.
Methods Used
- Partial enzymatic hydrolysis of α-lactalbumin to generate amphiphilic peptides.
- Self-assembly of peptides into nanomicelles encapsulating capsaicin.
- Mixing nanomicelles with hyaluronic acid and polyvinyl alcohol matrix.
- Casting the mixture into PDMS molds and centrifugation to form MN arrays.
- Vacuum drying to finalize MN patches.
- Scanning electron microscopy for morphology analysis.
- Confocal microscopy for skin penetration and drug release verification.
- In vivo testing in high-fat diet mice.
Main Results
- Uniform MN morphology confirmed by electron microscopy.
- MN patches demonstrated sufficient mechanical strength for skin penetration and dissolved within 30 minutes.
- Confocal microscopy verified effective skin penetration and capsaicin release.
- In vivo application in mice led to reduced fat mass, increased metabolic activity, and induction of adipose tissue browning.
Conclusions
- The protocol enables reproducible fabrication of dissolvable MN patches for hydrophobic drug delivery.
- MN patches provide a minimally invasive and effective method for targeted transdermal therapy.
- This approach holds promise for obesity management and can be adapted for other hydrophobic bioactives.
Frequently Asked Questions
Chapters in this video
0:00
Introduction
0:30
Preparation of Alpha‐Lactalbumin‐Based Nanomicelles Encapsulating Capsaicin via Enzymatic Self‐Assembly
2:07
Fabrication of Dissolvable Microneedle Patches Loaded with Capsaicin Nanomicelles
3:25
In Vivo Insertion and Dissolution Test
3:56
Results
5:49
Conclusion
