Collective bacterial disinfection by opto-chemical treatment on mature biofilm in clinical endoscope

Van Nam Tran, Suhyun Park, Fazlurrahman Khan, Van Gia Truong, Seok Jeong, Don Haeng Lee, Young Mog Kim, Hyun Wook Kang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The present study proposes an innovative opto-chemical treatment using a basket-integrated optical device (BIOD) to disinfect mature bacterial biofilm on endoscope channels. A BIOD was designed to position an optical diffuser on the central axis of an endoscope channel and to distribute laser light concentrically to the bacterial biofilm on the channel surface. To apply thermal damage and oxidative stress to the bacterial biofilm, a low concentration of a crosslinking agent (glutaraldehyde ~0.5%) was combined with 808 nm infrared (IR) and 405 nm blue (BL) laser lights. The applied irradiances of IR and BL were 10 W/cm2 and 1.6 W/cm2 for Teflon channel model and 20 W/cm2 and 3.2 W/cm2 for a clinical model, respectively. Individual irradiation of either IR or BL for 180 s induced the maximum temperatures of 62 ± 2 °C and 53 ± 3 °C on the biofilm, respectively. The simultaneous opto-chemical treatment reduced a significant population of the bacterial biofilms (7.5-log10 for Staphylococcus aureus and 7.1-log10 for Pseudomonas aeruginosa), which were 2.9-fold and 3.9-fold higher than that of the standard treatment with 2% glutaraldehyde (GA) solution, respectively. The proposed opto-chemical disinfection method can help reduce multi-drug resistant bacteria and prevent cross-infection during the clinical usage of a flexible endoscope.

Original languageEnglish
Article number112367
JournalJournal of Photochemistry and Photobiology B: Biology
StatePublished - Jan 2022


  • Bacterial biofilm
  • Blue light
  • Disinfection
  • Flexible endoscope
  • Glutaraldehyde
  • Infrared light


Dive into the research topics of 'Collective bacterial disinfection by opto-chemical treatment on mature biofilm in clinical endoscope'. Together they form a unique fingerprint.

Cite this