Laser-triggered drug release from polymeric 3-D micro-structured films via optical fibers

Mater Sci Eng C Mater Biol Appl. 2020 May:110:110664. doi: 10.1016/j.msec.2020.110664. Epub 2020 Jan 15.

Abstract

Photosensitive polymeric three-dimensional microstructured film (PTMF) is a new type of patterned polymeric films functionalized with an array of sealed hollow 3D containers. The microstructured system with enclosed chemicals provides a tool for the even distribution of biologically active substances on a given surface that can be deposited on medical implants or used as a cells substrate. In this work, we proposed a way for photothermally activating and releasing encapsulated substances at picogram amounts from the PTMF surface in different environments using laser radiation delivered with a multimode optical fiber. The photosensitive PTMFs were prepared by the layer-by-layer (LbL) assembly from alternatively charged polyelectrolytes followed by covering with a layer of hydrophobic polylactic acid (PLA) and a layer of gold nanoparticles (AuNPs). Moreover, the typical photothermal cargo release amounts were determined on the surface of the PTMF for a range of laser powers delivered to films placed in the air, deionized (DI) water, and 1% agarose gel. The agarose gel was used as a soft tissue model for developing a technique for the laser activation of PTMFs deep in tissues using optical waveguides. The number of PTMF chambers activated by a near-infrared (NIR) laser beam was evaluated as the function of optical parameters.

Keywords: Chamber array; Controlled drug delivery; Infrared laser; Microstructured film; Optical fiber; Polyelectrolyte multilayer.

MeSH terms

  • Drug Liberation*
  • Infrared Rays
  • Lasers*
  • Optical Fibers*
  • Polyelectrolytes / chemistry
  • Polymers / chemistry*
  • Static Electricity

Substances

  • Polyelectrolytes
  • Polymers