Electroactive Silk Fibroin Films for Electrochemically Enhanced Delivery of Drugs

Mousavi, Seyed and Harper, Garry and Municoy, Sofia and Ashton, Mark and Townsend, David and Alsharif, Ghazi and Oikonomou, Vasileios and Au-Yong, Sophie and Murdock, Beth and Akien, Geoffrey and Halcovitch, Nathan and Baldock, Sara and Fazilati, Mohamad and Kolosov, Oleg and Robinson, Benjamin and Desimone, Martin and Hardy, John (2020) Electroactive Silk Fibroin Films for Electrochemically Enhanced Delivery of Drugs. Macromolecular Materials and Engineering, 305 (6): 2000130. ISSN 1438-7492

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Abstract

Biomaterials capable of controlling the delivery of drugs have the potential to treat a variety of conditions. Herein, the preparation of electrically conductive silk fibroin film‐based drug delivery devices is described. Casting aqueous solutions of Bombyx mori silk fibroin, followed by drying and annealing to impart β‐sheets to the silk fibroin, assure that the materials are stable for further processing in water; and the silk fibroin films are rendered conductive by generating an interpenetrating network of a copolymer of pyrrole and 3‐amino‐4‐hydroxybenzenesulfonic acid in the silk fibroin matrix (characterized by a variety of techniques including circular dichroism, Fourier‐transform infrared spectroscopy, nuclear magnetic resonance, Raman spectroscopy, resistance measurements, scanning electron microscopy‐energy dispersive X‐ray spectroscopy, thermogravimetric analysis, X‐ray diffraction, and X‐ray photoelectron spectroscopy). Fibroblasts adhere on the surface of the biomaterials (viability assessed using an (3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) assay and visualized using a confocal microscope), and a fluorescently labeled drug (Texas‐Red Gentamicin) can be loaded electrochemically and released (µg cm−2 quantities) in response to the application of an electrical stimulus.