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An anthracene carboxyimide derivative was synthesized as a colorimetric and fluorogenic sensor to determine NO2 with a rapid response (<4 min), excellent selectivity and a low detection limit (84 nM). Paper strips containing the sensor were applied to visually determine the NO2 content in food.

Graphical abstract: A colorimetric and fluorescent lighting-up sensor based on ICT coupled with PET for rapid, specific and sensitive detection of nitrite in food

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