Abstract
Experiments were conducted to determine the physical quality of vacuum freeze-dried Button Mushrooms. Different treatments without and with blanching, before and after segmenting the mushrooms were taken for study. Three samples of Button Mushrooms (T1, T2, and T3) and the working pressure of 0.75 Torr or 100 Pa and temperature (-28°C) were considered for experimental investigations. Various physical parameters like density, shrinkage, color, and rehydration ratio were determined. The lowest and highest density recorded was 0.119 g cm¬¬-3 & 0.1568 g cm-3 for T3 and T1, respectively at 0.75 Torr. In the same way low and high shrinkage was 1.8% and 4.28 % for T2 and T1, respectively at 0.75 Torr. The L* value which expresses the color exhibited high at 71.13 and low at 71.96, respectively for T3 ¬ and T1 at 0.75 Torr. For samples T1 and T2, the lowest and maximum rehydration ratios were found as 2.33 and 4.44, respectively at 0.75 Torr. Treatment T2 was found to have a better rehydration ratio.
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