Publication: Highly stable and fast-dissolving ascorbic acid-loaded microneedles
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Issued Date
2023
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File Type
application/pdf
Rights Holder(s)
Scopus
Bibliographic Citation
International Journal of Cosmetic Science. Vol 45, No.5 (2023), p.612-626
Suggested Citation
Leelawattanachai J., Panyasu K., Prasertsom K., Manakasettharn S., Duangdaw H., Budthong P., Thepphornbanchakit N., Chetprayoon P., Muangnapoh K., Srinives S., Waraho-Zhmayev D., Triampo D. Highly stable and fast-dissolving ascorbic acid-loaded microneedles. International Journal of Cosmetic Science. Vol 45, No.5 (2023), p.612-626. doi:10.1111/ics.12865 Retrieved from: https://hdl.handle.net/20.500.14740/12718
Other Contributor(s)
Abstract
Objectives: Ascorbic acid has many benefits to the skin. Numerous attempts to promote its topical delivery show great challenges since its chemical instability and poor skin impermeability. Microneedle delivery is a simple, safe, painless and effective means to deliver therapeutic or nourishing molecules into the skin. The purpose of this study was twofold: (a) to develop a new formulation of ascorbic acid-loaded microneedles to enhance ascorbic acid stability by investigating an optimal amount of polyethyleneimine as an additive to the dextran-based microneedle formulation and (b) to assess microneedle properties in terms of dissolving rate, skin penetration ability, biocompatibility and antimicrobial activity. Methods: The microneedles formulated with ascorbic acid and varied polyethyleneimine concentrations were fabricated and subsequently tested for ascorbic acid stability using 2,2-diphenyl-1-picrylhydrazyl assay. The dissolution rate and skin penetration depth were investigated in porcine skin and the reconstructed human full-thickness skin model respectively. The skin irritation tests were done according to the Organisation for Economic Co-operation and Development Test Guideline No. 439. An antimicrobial disc susceptibility test was performed against Escherichia coli, Staphylococcus aureus and Staphylococcus epidermidis. Results: Among varied amounts of 0%, 1.5%, 3.0% and 4.5% (w/v), the 3.0% polyethyleneimine showed the most desirable characteristics, including well-preserved shape integrity after demoulding, significantly improved stability of ascorbic acid (p < 0.001) from 33% to 96% antioxidant activity after 8 weeks of storage at 40°C, increased dissolving rate (p < 0.001) by being completely dissolved within 2 min after the skin insertion, passing skin penetration and biocompatibility tests as well as having a broad spectrum of antimicrobial property. Conclusion: With a safety profile and enhanced properties, the new formulation of ascorbic acid-loaded microneedles shows outstanding potential as commercially available cosmetics and healthcare products. © 2023 Society of Cosmetic Scientists and Societe Francaise de Cosmetologie.