摘要：Moisture adsorption curves of the green and black teas were determined by using saturated salt solution ranged from 0.1-0.9 water activity values with standard gravimetric methods at 15 and 25 °C. GAB, BET, Oswin, Kuhn, Filonenko-Chuprin, Cubic, Peleg and Halsey models used for expressing the moisture adsorption curves of green and black teas. It has been found that GAB model has higher regression coefficient (R2), lower RMSE % and SSE values compared to other mathematical models. Water activity (aw) values of black and green teas have been found as 0.3619 and 0.4659 respectively. Heat of sorption of black and green tea varied between 12.96-4.762 kj/mole and 12.18-4.946 kj/mole respectively at moisture levels varying between 4-6 g water/100 g dry basis.
关键词：Aw; GAB; heat of sorption; isotherm; black and green tea; regression
