was inactivated, the moisture reductions were estimated to be in
the range from 15.35% to 49.29%. Thus, at these processing times
the surface color change (DE) was obtained from the closest
tested processing time; this is also presented in Table 3. It can
be deduced that for quick blanching the combination of medium
to high radiation intensity and thin to medium slice thickness
should be beneficial, since it requires relatively short processing
time. On the other hand, when the desired moisture reduction
is higher than 20%, the combination of low radiation intensity
and thick slice is suggested. All the processing conditions can produce
processed apple slices with good quality. This suggests that
SIRDBD with continuous heating could be a promising alternative
to the current blanching and dehydration methods for preparing
high-quality blanched and partially dehydrated fruits and
vegetables.
When more than 1 log reduction of POD needs to be inactivated,
high radiation intensity could result in severe surface discoloration.
One possible solution is to apply intermittent heating, which
has been suggested by Sandu (1986) to solve the problem of limited
penetration of FIR and the application of FIR on thick materials.
The advantages of intermittent radiation are energy savings
and improved product quality, since the desired processing temperature
can be maintained (Chua and Chou, 2003). We also studied
the processing characteristics and product quality of SIRDBD
with intermittent heating and found that this eliminated the possibility
of surface charring. More detailed information about intermittent
IR heating for blanching and dehydration will be reported
was inactivated, the moisture reductions were estimated to be inthe range from 15.35% to 49.29%. Thus, at these processing timesthe surface color change (DE) was obtained from the closesttested processing time; this is also presented in Table 3. It canbe deduced that for quick blanching the combination of mediumto high radiation intensity and thin to medium slice thicknessshould be beneficial, since it requires relatively short processingtime. On the other hand, when the desired moisture reductionis higher than 20%, the combination of low radiation intensityand thick slice is suggested. All the processing conditions can produceprocessed apple slices with good quality. This suggests thatSIRDBD with continuous heating could be a promising alternativeto the current blanching and dehydration methods for preparinghigh-quality blanched and partially dehydrated fruits andvegetables.When more than 1 log reduction of POD needs to be inactivated,high radiation intensity could result in severe surface discoloration.One possible solution is to apply intermittent heating, whichhas been suggested by Sandu (1986) to solve the problem of limitedpenetration of FIR and the application of FIR on thick materials.The advantages of intermittent radiation are energy savingsand improved product quality, since the desired processing temperaturecan be maintained (Chua and Chou, 2003). We also studiedthe processing characteristics and product quality of SIRDBDwith intermittent heating and found that this eliminated the possibilityof surface charring. More detailed information about intermittentIR heating for blanching and dehydration will be reported
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