Acidity-triggered charge-convertible nanoparticles that can cause bacterium-specific aggregation in situ to enhance photothermal ablation of focal infection

Chiranjeevi Korupalli, Chieh Cheng Huang, Wei Chih Lin, Wen Yu Pan, Po Yen Lin, Wei Lin Wan, Meng Ju Li, Yen Chang, Hsing Wen Sung

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Focal infections that are caused by antibiotic-resistant bacteria are becoming an ever-growing challenge to human health. To address this challenge, a pH-responsive amphiphilic polymer of polyaniline-conjugated glycol chitosan (PANI-GCS) that can self-assemble into nanoparticles (NPs) in situ is developed. The PANI-GCS NPs undergo a unique surface charge conversion that is induced by their local pH, favoring bacterium-specific aggregation without direct contact with host cells. Following conjugation onto GCS, the optical-absorbance peak of PANI is red-shifted toward the near-infrared (NIR) region, enabling PANI-GCS NPs to generate a substantial amount of heat, which is emitted to their neighborhood. The local temperature of the NIR-irradiated PANI-GCS NPs is estimated to be approximately 5 °C higher than their ambient tissue temperature, ensuring specific and direct heating of their aggregated bacteria; hence, damage to tissue is reduced and wound healing is accelerated. The above results demonstrate that PANI-GCS NPs are practical for use in the photothermal ablation of focal infections.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalBiomaterials
Volume116
DOIs
Publication statusPublished - Feb 1 2017

Keywords

  • Charge conversion
  • Imaging guiding
  • pH-responsive nanoparticles
  • Photothermal therapy
  • Subcutaneous abscesses

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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