Optimization and evaluation of a chitosan/hydroxypropyl methylcellulose hydrogel containing toluidine blue O for antimicrobial photodynamic inactivation

Chueh Pin Chen, Chien Ming Hsieh, Tsuimin Tsai, Jen Chang Yang, Chin Tin Chen

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Photodynamic inactivation (PDI) combined with chitosan has been shown as a promising antimicrobial approach. The purpose of this study was to develop a chitosan hydrogel containing hydroxypropyl methylcellulose (HPMC), chitosan and toluidine blue O (TBO) to improve the bactericidal efficacy for topical application in clinics. The PDI efficacy of hydrogel was examined in vitro against the biofilms of Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa). Confocal scanning laser microscopy (CSLM) was performed to investigate the penetration level of TBO into viable S. aureus biofilms. Incorporation of HMPC could increase the physicochemical properties of chitosan hydrogel including the hardness, viscosity as well as bioadhesion; however, higher HMPC concentration also resulted in reduced antimicrobial effect. CSLM analysis further demonstrated that higher HPMC concentration constrained TBO diffusion into the biofilm. The incubation of biofilm and hydrogel was further performed at an angle of 90 degrees After light irradiation, compared to the mixture of TBO and chitosan, the hydrogel treated sample showed increased PDI efficacy indicated that incorporation of HPMC did improve antimicrobial effect. Finally, the bactericidal efficacy could be significantly augmented by prolonged retention of hydrogel in the biofilm as well as in the animal model of rat skin burn wounds after light irradiation.

Original languageEnglish
Pages (from-to)20859-20872
Number of pages14
JournalInternational Journal of Molecular Sciences
Volume16
Issue number9
DOIs
Publication statusPublished - Sep 1 2015

Keywords

  • Chitosan
  • Hydrogel
  • Photodynamic inactivation
  • Toluidine blue O

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Spectroscopy
  • Inorganic Chemistry
  • Catalysis
  • Molecular Biology
  • Computer Science Applications

Fingerprint Dive into the research topics of 'Optimization and evaluation of a chitosan/hydroxypropyl methylcellulose hydrogel containing toluidine blue O for antimicrobial photodynamic inactivation'. Together they form a unique fingerprint.

  • Cite this