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Fiber‐optic Singlet Oxygen [ 1 O 2 ( 1 Δ g )] Generator Device Serving as a Point Selective Sterilizer
Author(s) -
Aebisher David,
Zamadar Matibur,
Mahendran Adaickapillai,
Ghosh Goutam,
McEntee Catherine,
Greer Alexander
Publication year - 2010
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2010.00748.x
Subject(s) - singlet oxygen , photobleaching , photochemistry , photosensitizer , oxygen , chemistry , optical fiber , singlet state , materials science , fluorescence , analytical chemistry (journal) , optics , chromatography , excited state , atomic physics , organic chemistry , physics
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 f m 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 × 10 7 cells. Photobleaching of the probe tip occurred after ca 12 h of use, requiring baking and sensitizer reloading steps for reuse.