Shedding light on the dark problem of biofilms
Bacterial biofilms are problematic wherever water contacts with surfaces. Although germicidal ultraviolet -C irradiation effectively inactivates microorganisms in flowing water, controlling surface biofilms is challenging due to light delivery limitations within enclosed and flowing water systems. Here, to overcome this, we developed a novel method using UV-C light-emitting diodes connected to side-emitting optical fibres placed directly on metal surfaces.
Targeting mixed-bacterial biofilms from the International Space Station where biofilms threaten critical water systems for astronauts, we successfully inhibited biofilm growth by delivering UV-C light at 265 or 275 nm with an irradiance of >10 µW cmvia SEOFs. In contrast, UV-A or UV-B at the same irradiance did not prevent biofilm growth.
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