Abstract
There is a lack of methods to evaluate the extent of thermal treatment of biological tissue. The intensity of the near-infrared (NIR) emission photo-excitation was investigated from tissue undergoing different levels of heat treatment. Chicken muscle was heated in an oven at different temperature levels ranging from 40 degrees C until burn-off. The spectral emission intensity from these heat-treated tissues was measured with a CCD camera and the intensity was calculated. The emission intensity increased proportionally with respect to the extent of treatment temperature until burning. Linear relationships between treatment temperature and the emission intensity from tissue samples were found in three temperature ranges: from 40 to 160 degrees C, from 165 to 220 degrees C, and from 225 to 250 degrees C. The change in tissue damage after heat treatment could be detected by measuring the NIR emission intensity from the thermally damaged tissues.
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