Title

Fiber-optic Singlet Oxygen [1 O2 ( 1 Dg)] Generator Device Serving as a Point Selective Sterilizer

Document Type

Article

Publication Date

2010

Abstract

Traditionally, Type II heterogeneous photo-oxidations produce singlet oxygen via external irradiation of a sensitizer and external supply of ground-state oxygen. A potential improvement is reported here. A hollow-core fiber-optic device was developed with an ‘‘internal’’ supply of light and flowing oxygen, and a porous photosensitizer-end capped configuration. Singlet oxygen was delivered through the fiber tip. The singlet oxygen steady-state concentration in the immediate vicinity of the probe tip was ca 20 fM by N-benzoyl-DL-methionine trapping. The device is portable and the singlet oxygen-generating tip is maneuverable, which opened the door to simple disinfectant studies. Complete Escherichia coli inactivation was observed in 2 h when the singlet oxygen sensitizing probe tip was immersed in 0.1 mL aqueous samples of 0.1–4.4 · 107 cells. Photobleaching of the probe tip occurred after ca 12 h of use, requiring baking and sensitizer reloading steps for reuse.

Comments

David Aebisher; Matibur Zamadar; Adaickapillai Mahendran; Goutam Ghosh; Cathy McEntee; Alexander Greer “Fiber-Optic Singlet-Oxygen [102(1g)] Generator Device Serving as a Point Selective Sterilizer” Photochem. Photobiol. 2010, 86, 890-894. (Featured article in American Society for Photobiology Home & appeared in American Society for Photobiology Newsletter in Autumn 2010, Vol 39, [4:214]).

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