Abstract
The aim of this research was to determine the adsorption behaviour of bulgur. Three different particle sizes (2<coarse<3.5, 1.6<medium<3.0, 0.5<fine<2.0mm) of bulgur, purchased from market, were kept in nine different equilibrium levels of relative humidity (8.2–97.3%) at 20, 30 and 40°C. The data obtained were evaluated using BET (Brunauer–Emmett–Teller) and GAB (Guggenheim, Anderson and deBoer) sorption equations. The equilibrium moisture content of bulgur increased both with decreasing temperature and bulgur size. The constants m0 and C of BET and GAB equations were determined to be between 2.54 and 5.03g water per 100g of dry matter and 4.96–16.57, respectively. Constant k was between 0.85 and 0.93, and GAB equation was determined to fit very well for bulgur adsorption, because of %E values lower than 10%. Bulgur must be stored below 70% relative humidity and with less than 10g water per 100g of dry mater.
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