Color changing device for monitoring shelf-life of perishable pr

Details Color changing device for monitoring shelf-life of perishable pr Color changing device for monitoring shelf-life of perishable pr

1988-11-03

1991-10-01

Johnston, Jill

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

116206, 116207, 116216, 116218, 2524081, 422 56, 422 57, 422 58, 426 88, 426231, 436 7, G01N 3122

Patent

active

050533398

ABSTRACT:
A color changing device for monitoring the time-temperature storage history, i.e. shelf life, of perishable products. The device is constructed of an activator tape, containing an activator composition matrix, an indicating tape, containing an indicating composition matrix and an optional barrier matrix between the activator tape and the indicating tape. At least one matrix is a pressure sensitive adhesive. The activating composition, e.g. an organic acid such as citric acid, diffuses through the barrier and/or indicating matrix to continuously contact the indicating composition, e.g. an acid-base dye indicator such as 2,2',4,4',4",-pentamethoxy triphenylmethanol, to produce a visually observable color change at the temperature being monitored. The color intensifies with time and temperature, as more activator composition diffuses into the indicating matrix. The matrices are water-impermeable and the device preferably possesses activation energy and rate constant values for the color change which are substantially the same as those for product decay. This allows accurate and continuously observable monitoring of the abailable shelf-life of the perishable product to which the device is adhered to.

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