influence (p
0.05) on TR of mushroom (Fig. 3). However, RH was
the variable with greatest influence on TR. Increasing RH of the
storage environment from 76 to 100% decreased TR by 93% at 4 C,
while decreasing the temperature from 20 C to 4 C decreased TR
by 71%. The TR increased with an increase in temperature and a
decrease in RH, with the highest TR observed at 20 C and 76% RH,
such conditions should be avoided in order to prevent excessive
weight loss of mushrooms. On the other hand, lowest TR was
recorded at 4 C and 100% RH, the conditions normally observed in
headspace of packed fresh produce. Biophysical properties of the
skin, air
film resistance, respiration heat generation, evaporative
cooling, convective and radiative heat
flows, vapour pressure
lowering due to dissolved substances, and temperature distribution
inside the produce affect the transpiration rate. Veraverbeke
et al. (2003) described the moisture transfer through the skin using
biophysical and thermophysical properties such as surface cellular
structure, skin thickness, pore fraction in the skin, geometry and
thermal diffusivity of produce, however, such properties are not
easily measured. The experimental TR values obtained in this study
were in agreement with those reported by Mahajan et al. (2008a
influence (p0.05) on TR of mushroom (Fig. 3). However, RH wasthe variable with greatest influence on TR. Increasing RH of thestorage environment from 76 to 100% decreased TR by 93% at 4 C,while decreasing the temperature from 20 C to 4 C decreased TRby 71%. The TR increased with an increase in temperature and adecrease in RH, with the highest TR observed at 20 C and 76% RH,such conditions should be avoided in order to prevent excessiveweight loss of mushrooms. On the other hand, lowest TR wasrecorded at 4 C and 100% RH, the conditions normally observed inheadspace of packed fresh produce. Biophysical properties of theskin, airfilm resistance, respiration heat generation, evaporativecooling, convective and radiative heatflows, vapour pressurelowering due to dissolved substances, and temperature distributioninside the produce affect the transpiration rate. Veraverbekeet al. (2003) described the moisture transfer through the skin usingbiophysical and thermophysical properties such as surface cellularstructure, skin thickness, pore fraction in the skin, geometry andthermal diffusivity of produce, however, such properties are noteasily measured. The experimental TR values obtained in this studywere in agreement with those reported by Mahajan et al. (2008a
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