by Keyword: Electrostimulated release

Enshaei, H, Molina, BG, Puiggali-Jou, A, Saperas, N, Aleman, C, (2022). Polypeptide hydrogel loaded with conducting polymer nanoparticles as electroresponsive delivery system of small hydrophobic drugs European Polymer Journal 173, 111199

A hydrogel/nanoparticle-loaded system for the controlled delivery of small hydrophobic drugs has been prepared using poly(gamma-glutamic acid) (PGGA), a naturally occurring biopolymer made of glutamic acid units connected by amide linkages between alpha-amino and gamma-carboxylic acid groups, and poly(3,4-ethylenedioxythiophene) (PEDOT), a very stable conducting polymer with excellent electrochemical response. Specifically, curcumin (CUR)-loaded PEDOT nanoparticles (PEDOT/CUR) were incorporated to the PGGA hydrogel during the crosslinking reaction. After chemical, morphological and electrochemical characterization, the release profiles of PEDOT/CUR and PGGA/PEDOT/CUR system have been compared in absence and presence of electrical stimuli, which consisted on the application of a voltage of -0.5 V for 15 min every 24 h. Results show that the release is higher for electrically stimulated systems by more than twice, even though due to its hydrophobicity and poor solubility in water the release was relatively slow in both cases. This feature could be advantageous when the therapeutic treatment requires slow, controlled and sustained CUR release.

JTD Keywords: 4-ethylenedioxythiophene), Acid, Controlled-release, Curcumi n, Curcumin, Electrostimulated release, Nanocarriers, Pedotpss, Poly( ?-glutamic acid), Poly(3

Enshaei H, Puiggalí-Jou A, del Valle LJ, Turon P, Saperas N, Alemán C, (2021). Nanotheranostic Interface Based on Antibiotic-Loaded Conducting Polymer Nanoparticles for Real-Time Monitoring of Bacterial Growth Inhibition Advanced Healthcare Materials 10,

© 2020 Wiley-VCH GmbH Conducting polymers have been increasingly used as biologically interfacing electrodes for biomedical applications due to their excellent and fast electrochemical response, reversible doping–dedoping characteristics, high stability, easy processability, and biocompatibility. These advantageous properties can be used for the rapid detection and eradication of infections associated to bacterial growth since these are a tremendous burden for individual patients as well as the global healthcare system. Herein, a smart nanotheranostic electroresponsive platform, which consists of chloramphenicol (CAM)-loaded in poly(3,4-ethylendioxythiophene) nanoparticles (PEDOT/CAM NPs) for concurrent release of the antibiotic and real-time monitoring of bacterial growth is presented. PEDOT/CAM NPs, with an antibiotic loading content of 11.9 ± 1.3% w/w, are proved to inhibit the growth of Escherichia coli and Streptococcus sanguinis due to the antibiotic release by cyclic voltammetry. Furthermore, in situ monitoring of bacterial activity is achieved through the electrochemical detection of β-nicotinamide adenine dinucleotide, a redox active specie produced by the microbial metabolism that diffuse to the extracellular medium. According to these results, the proposed nanotheranostic platform has great potential for real-time monitoring of the response of bacteria to the released antibiotic, contributing to the evolution of the personalized medicine.

JTD Keywords: bacterial detection, chloramphenicol, conducting polymers, drug, drug release, electrochemical sensors, electrochemistry, electrostimulated release, mechanism, peptide, polythiophene, sensor, sulfonate, Bacterial detection, Chloramphenicol, Conducting polymers, Controlled-release, Drug release, Electrochemical sensors, Electrostimulated release, Polythiophene