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Metal nanoparticles can be easily used to generate oxygen and to cultivate aerobic microorganisms during the storage of food. There has been growing interest in developing nontoxic and irreversible sensors of oxygen in food-free, oxygen-free systems such as vacuum or nitrogen packaging. A UV colorimetric oxygen indicator was developed with UVA light that uses titania nanoparticles (TiO₂) to photosensitize the reduction in polymer encapsulation of methylene blue by triethanolamine. The sensor bleaches through UV irradiation and stays colorless before oxygen is added to the initial blue light. The survival time is relative to the amount of access to oxygen [4, 56].