10.1007/s40204-020-00143-2

Engineered PLGA-PVP/VA based formulations to produce electro-drawn fast biodegradable microneedles for labile biomolecule delivery

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  • Valentina Onesto1,
  • Concetta Di Natale2,
  • Martina Profeta1,
  • Paolo Antonio Netti2,
  • Raffaele Vecchione*2,
  1. Center for Advanced Biomaterials for Health Care, CRIB, Istituto Italiano di Tecnologia, Naples, 80125, IT
  2. Center for Advanced Biomaterials for Health Care, CRIB, Istituto Italiano di Tecnologia, Naples, 80125, IT Interdisciplinary Research Center of Biomaterials, CRIB, University Federico II, Naples, 80125, IT
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Published in Issue 2020-11-03

How to Cite

Onesto, V., Di Natale, C., Profeta, M., Netti, P. A., & Vecchione, R. (2020). Engineered PLGA-PVP/VA based formulations to produce electro-drawn fast biodegradable microneedles for labile biomolecule delivery. Progress in Biomaterials, 9(4 (December 2020). https://doi.org/10.1007/s40204-020-00143-2
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Abstract

Abstract Biodegradable polymer microneedles (MNs) are recognized as non-toxic, safe and stable systems for advanced drug delivery and cutaneous treatments, allowing a direct intradermal delivery and in some cases a controlled release. Most of the microneedles found in the literature are fabricated by micromolding, which is a multistep thus typically costly process. Due to industrial needs, mold-free methods represent a very intriguing approach in microneedle fabrication. Electro-drawing (ED) has been recently proposed as an alternative fast, mild temperature and one-step strategy to the mold-based techniques for the fabrication of poly(lactic- co -glycolic acid) (PLGA) biodegradable MNs. In this work, taking advantage of the flexibility of the ED technology, we engineered microneedle inner microstructure by acting on the water-in-oil (W/O) precursor emulsion formulation to tune drug release profile. Particularly, to promote a faster release of the active pharmaceutical ingredient, we substituted part of PLGA with poly(1-vinylpyrrolidone- co -vinyl acetate) (PVP/VA), as compared to the PLGA alone in the matrix material. Moreover, we introduced lecithin and maltose as emulsion stabilizers. Microneedle inner structural analysis as well as collagenase entrapment efficiency, release and activity of different emulsion formulations were compared to reach an interconnected porosity MN structure, aimed at providing an efficient protein release profile. Furthermore, MN mechanical properties were examined as well as its ability to pierce the stratum corneum on a pig skin model, while the drug diffusion from the MN body was monitored in an in vitro collagen-based dermal model at selected time points.

Keywords

  • Electro-drawing,
  • Microneedles,
  • Transdermal drug delivery,
  • Protein release,
  • Controlled release,
  • PLGA
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