Evaluation of thermal decomposition of liver tissues from both control and chromium-inoculated chick embryos by thermogravimetric analysis

The order of reactions and activation energy associated with the thermal decomposition of Cr-inoculated liver tissue and control liver tissue of chick embryo have been obtained by thcnnogravinietric methods in alienee sad presence of nitrogen atmosphere. In the temperature range of 25° to about 1100", the differential thermogram has yielded four distinct peaks for these sample. However, the fourth peak has disappeared in nitrogen ateosphere. The thermal decomposition corresponding to each peak has been analysed and activation energy estimated accordingly. The peak temperature associate with the first peak decreases as the water content in the sample increases. The first and the second peaks correspond to losses of water and protein, respectively. The third and fourth peaks have been identified for mucopolysaccharide and due to oxidation in presence of air at high temperature, respectively. These decomposition behaviours are similar to the collagen content in liver tissues.