Patent ID: 7153532

Claim:
A sensor for detecting a gaseous substance resulting from: (1) food spoilage within food packaging; (2) opening of the food packaging; or (3) compromise of the food packaging, the sensor comprising: a film comprising a sensor composition, disposed on an internal surface of the food packaging or disposed on a label retained inside the food packaging, wherein said sensor composition comprises a resinous material and a metal co-ordinated complex, where in the metal is selected from the group consisting of palladium, platinum, ruthenium, and iron, and wherein the complex, upon exposure to the gaseous substance resulting from (1) food spoilage; (2) the opening of the food packaging; or (3) the compromise of the food packaging, undergoes a ligand exchange reaction by the binding of the gaseous substance to the metal(s) atom of the complex to release a component from the metal co-ordinated complex, creating a detectable change to the sensor.