thermal behavior of the kidney, heart and liver of spontaneous hypertension
rats (SHR) were studied by thermogravimetry (TG) and differential thermal
analysis (DTA). SHR are, by far, the most widely used rat model in the study
of heart diseases in mammals, because they develop chronic hypertension, which
leads to heart failure during their lives. TG curves showed two steps for
all samples: at 800C less residues remained for an SHR kidney (4.01.8%)
than for an SHR heart (6.90.4) and liver samples (7.51.9%).
It probably happened due to the presence of inorganic substances such as iron,
calcium, magnesium, potassium and sodium. DTA curves depicted three endothermic
events for kidney (70, 120 and 310C), heart (85, 250 and 300C) and
liver samples (70, 250 and 310C), indicating protein denaturation, as
well as protein degradation and fat degradation, respectively. TG/DTG/DTA
profiles of organs samples showed peculiarities that permit correlation between
them. These methods might serve as a simple alternative to investigations
over these vital organs.