Abstract
Moisture sorption isotherms of blanched and unblanched mushrooms over 0.11-0.75 a w were determined at 27°C and 37°C by using the static gravimetric method. Adsorption and desorption behaviors of blanched and unblanched mushrooms were compared. The unblanched material adsorbed more water than that of the blanched. In desorption isotherms, the equilibrium moisture contents of the unblanched material were found to be higher than those of the blanched throughout the entire a w range. The BET equation was tested to fit the experimental moisture sorption data over the 0.11-0.43 a w , 0.11-0.55 a w , 0.11-0.64 a w , and 0.11-0.75 a w . Nonlinear regression analysis was used for the determination of the parameters in the equation. The quality of the fit of the BET model over each a w range was judged from the value of the relative percent root mean square (% RMS). The moisture sorption behavior over 0.11-0.43 a w of mushrooms has indicated that the BET equation is applicable generally up to 0.43 a w . Monolayer moisture contents and C constants in the BET equation obtained for each a w interval were reported. The water activities corresponding to the monolayer values have been determined and discussed related to mushroom storage. The net isosteric heats of adsorption and desorption were estimated from equilibrium sorption data, using the integrated form of the Clausius-Clapeyron equation. The heats of adsorption/desorption decreased with increase in moisture content and approached to a constant value. It was concluded that moisture adsorption/desorption occurred by physical mechanisms at high moisture contents, but at low moisture contents, besides physical adsorption, chemisorption was also observed.
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