Which of the following is an optical chemical sensing method of freshness indication in intelligent packaging?

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Topics include: Food active packaging, intelligent packaging systems, modified and controlled packaging techniques. Active food packaging is a concept that aims to extend a product's shelf life. Some examples of active food packaging include: Antimicrobial packaging: Reduces, inhibits, or delays the growth of pathogenic microorganisms in packaged food and packaging materials. Oxygen scavengers: Absorb oxygen to remove it from the packaging and extend the shelf life of food products. CO2 emitters: Actively produce and release carbon dioxide within the package to inhibit spoilage and... Show more

Which of the following is an optical chemical sensing method of freshness indication in intelligent packaging?