Agriculture Reference
In-Depth Information
With the increase of temperature up to 40
o
C initial rate of solid gain sharply rises and after
with further temperature increase values are sharply declining towards a minimum value
obtained for the highest temperature.
In Figure 4. the effects of sucrose concentration and temperature on solid gain at
equilibrium are given. At higher temperatures solid gain at equilibrium has higher values at
all selected sucrose concentrations. As it was said earlier, prolonged exposure of plant
material at high temperatures may cause decrease in cell membrane permeability. The
positive interaction effect between these two factors on solid gain at equilibrium showed to be
synergetic.
Figure 4. Effects of sucrose concentration and temperature on solid gain at equilibrium.
Combined Solutions
In Table 3. the ANOVA results for the osmotic dehydration in combined osmotic
medium (sucrose/sodium chloride) are reported. Obtained values of R
2
indicate good fit of
experimental data to Eq. (5). All polynomial models tested for the selected responses were
significant at 95% confidence level (p-value; 0.05, Table 3), the exception is second order
model solid gain at equilibrium that is significant at 90% confidence level. These results
suggest that is appropriate to represent experimental data of osmotic dehydration kinetics
parameters with response surface models when combined solutions are used. For the response
of initial water loss rate (WL 1/k
1
) coefficient of determination was found to be 0.982 while
for initial solid gain it was 0.972, which indicates that only 1.2% of the variations could not
be explained by the model for initial WL rate and 2.8% for the initial SG rate. As for
