Considering the importance of the citrus pulp in the formulation of elaborated rations and high nutritional quality for animal feed, this study had as its objective the determination of the water activity curves for peletized pulp citrus. The pulp was submitted to the desorption and adsorption under four conditions of temperature (20, 25, 30 and 35 ºC) and four relative humidity (50, 60, 70 and 80%) with three replications, until it reached the equilibrium moisture content. The temperature and the relative humidity of the air (water activity) were controlled by means of an air conditioning unit "Aminco-Aire". The model of Chen-Clayton (with determined constants to describe the curves of equilibrium moisture content of the peletized citrus pulp) presented a satisfactory adjustment to the experimental data and the same may be used for other applications within limits of this experiment. During the implementation of the experiment, it was observed that in the treatments above 30 ºC temperature and with water activity above 0.80, the samples presented fungus development.
peletized citrus pulp; equilibrium moisture content; water activity
