Latest Advances in the Study of Smart Hydrogels for Drug Delivery Systems

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (25 September 2023) | Viewed by 1844

Special Issue Editors


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Guest Editor
Center of Development of Nuclear Technology (CDTN), Belo Horizonte CEP 31270-901, Brazil
Interests: nanomaterials; hybrid systems; drug delivery; smart hydrogels

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Guest Editor
Institute of Integrated Engineering, Federal University of Itajubá, Itabira, Minas Gerais, Brazil
Interests: biomaterials; drug delivery systems; hydrogels

Special Issue Information

Dear Colleagues,

Hydrogels are reticulated three-dimensional polymeric networks with a high-water absorption capacity that enables them to reach several times their dry weight. Their responsiveness to environmental changes (such as temperature, magnetic field, ultrasound intensity, electrical or light pulses, pH, enzyme concentration, and gradient redox) enables diffusibility control, thus making them a promising tool in the field of medicine for the release of drugs. Hydrogels that change their properties in response to an external stimulus are known as smart materials. In the case of cancer therapy, the macromolecules are usually too large to leak out and accumulate in healthy tissue, and are also too large to cross the disorganized and porous vasculature of tumor regions, thus accumulating inside their interstices. Nevertheless, some of these polymeric networks may have insufficient mechanical strength when subjected to the shear rates of the circulatory system if this material is administered intravenously. The association of a second phase with this class of intelligent hydrogels is an alternative whereby the mechanical strength of the inorganic phase is combined with the responsiveness of the organic one, thus giving rise to compounds with broader applicability. Herein, we aim to provide an overview of the latest research concerning controlled drug delivery using smart hydrogels as a platform for therapy. Original articles on the synthesis and use of these systems for specific treatments, multi-agent encapsulation, hybrid system delivery, and/or multifunctional approaches to therapy are encouraged.

Prof. Dr. Edésia Martins Barros De Sousa
Dr. Andreza de Sousa Andrada
Guest Editors

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Keywords

  • smart hydrogels
  • drug delivery
  • multifunctional systems
  • hybrids
  • nanomaterials

Published Papers (1 paper)

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Research

27 pages, 8674 KiB  
Article
pH-Sensitive Hybrid System Based on Eu3+/Gd3+ Co-Doped Hydroxyapatite and Mesoporous Silica Designed for Theranostic Applications
by Rafaela Caroline Rodrigues dos Apostolos, Andreza de Sousa Andrada, André Felipe Oliveira, Ernesto Soares Freitas Neto and Edésia Martins Barros de Sousa
Polymers 2023, 15(12), 2681; https://doi.org/10.3390/polym15122681 - 14 Jun 2023
Cited by 1 | Viewed by 1470
Abstract
Nanomaterials such as pH-responsive polymers are promising for targeted drug delivery systems, due to the difference in pH between tumor and healthy regions. However, there is a significant concern about the application of these materials in this field due to their low mechanical [...] Read more.
Nanomaterials such as pH-responsive polymers are promising for targeted drug delivery systems, due to the difference in pH between tumor and healthy regions. However, there is a significant concern about the application of these materials in this field due to their low mechanical resistance, which can be attenuated by combining these polymers with mechanically resistant inorganic materials such as mesoporous silica nanoparticles (MSN) and hydroxyapatite (HA). Mesoporous silica has interesting properties such as high surface area and hydroxyapatite has been widely studied to aid in bone regeneration, providing special properties adding multifunctionality to the system. Furthermore, fields of medicine involving luminescent elements such as rare earth elements are an interesting option in cancer treatment. The present work aims to obtain a pH-sensitive hybrid system based on silica and hydroxyapatite with photoluminescent and magnetic properties. The nanocomposites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption methods, CHN elemental analysis, Zeta Potential, scanning electron microscopy (SEM), and transmission electron microscopy (TEM), vibrational sample magnetometry (VSM), and photoluminescence analysis. Incorporation and release studies of the antitumor drug doxorubicin were performed to evaluate the potential use of these systems in targeted drug delivery. The results showed the luminescent and magnetic properties of the materials and showed suitable characteristics for application in the release of pH-sensitive drugs. Full article
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