Food or edible material: processes – compositions – and products – Measuring – testing – or controlling by inanimate means – Involving packaged product or preparation thereof
Patent
1993-10-22
1995-10-17
Czaja, Donald E.
Food or edible material: processes, compositions, and products
Measuring, testing, or controlling by inanimate means
Involving packaged product or preparation thereof
426 87, 426106, 426126, 436172, 436165, G01N 3303
Patent
active
054588960
ABSTRACT:
A non-destructive technique for examining the oxidative status of packaged, dry or intermediate moisture foods. In a preferred embodiment, the technique involves packaging the foods in an assembly comprising a container or pouch formed from a pair of sheets heat-sealed to one another along their peripheries. The sheets may each be a trilaminate comprising a polyethylene terephthalate outer layer, an aluminum foil middle layer and a polyolefin inner layer. One of the sheets is provided with a cut-out portion which serves as a light transmissive window. A device comprising a strip of polyethylene terephthalate which is coated on one side with a polyamide coating is mounted across the light transmissive window, with the polyamide coating facing in towards the interior of the pouch. The food within the pouch is stored within about 2 cm of the polyamide coating during oxidation. To test the oxidative status of the food, a beam of about 420 nm light is used to illuminate the polyamide coating through strip of polyethylene terephthalate, and the resultant fluorescence is observed through the strip of polyethylene terephthalate at a wavelength of approximately 464 nm.
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Porter, abstract entitled "Polyamide Fluorescence as a Non-Destructive In-Package Test for Lipd Oxidation," Pittsburgh Conf. on Analytical and Applied Spectroscopy, Pittsburgh, Pa., Mar. 10, 1993.
Cano Milton I.
Czaja Donald E.
Donahue Richard J.
Lamming John H.
Ranucci Vincent J.
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