{'fraction_non_alphanumeric': 0.03177570093457944, 'fraction_numerical': 0.01588785046728972, 'mean_word_length': 5.413173652694611, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Fiber‐optic Singlet Oxygen [1O2 (1Δg)] Generator Device Serving as a Point Selective Sterilizer

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.