Desorption capacity of raw energy bars with fruits of Zizyphus jujuba Mill. - Bulgaria

Abstract

The current study presents a mixture for raw energy bars of fresh fruits of the exotic fruit Zizyphus jujuba Mill. with origin - Bulgaria. The physico-chemical indices of the ready mixture are analyzed. A high content of carbohydrates - 24.45% and of nourishing fiber - 22.08% is reported. The desorption capacity of the exotic mixture is examined for temperatures of 10°С, 25° and 40°С in eight watery activities from 11% to 85%. The analysis shows that the equilibrium moisture lowers with the raise of temperature in constant watery activities. The desorption isotherms are of type III according to the classification of Brunauer et al. The modified model of Halsey is recommended for the isotherms description according to the estimation criteria distribution, and the model of Oswin - as a second modified model. The values of the monolayer moisture content in aw <0.5 for temperatures 10°С - 5.46% dry basis (d.b.), 25°С - 5.72% d.b. and 40°C - 4.05% d.b. are calculated Brunauer-Emett-Teller model.