کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6405238 | 1330914 | 2012 | 6 صفحه PDF | دانلود رایگان |
Apple slices dried by two combination drying methods and by freeze-drying (FD) were evaluated for their composition and analyzed for texture, aroma and microstructure. FD and followed by microwave vacuum drying (FDÂ +Â MWVD) yielded dried samples of higher reducing sugars, total pectin and lower total phenols comparing to FD samples. On the other hand, MWVDÂ +Â FD samples had lower sugars, total phenols and total pectin than FDÂ +Â MWVD samples. On the whole, aroma retention in FDÂ +Â MWVD samples is better than MWVDÂ +Â FD products and worse than FD samples. Moreover, the crispness of FDÂ +Â MWVD samples was higher than MWVDÂ +Â FD samples and the hardness of FDÂ +Â MWVD samples was lower than MWVDÂ +Â FD samples. Microwave application had a significant effect on total phenols, pectin and aroma. In addition, longer time high temperature at desorption drying stage and short time higher temperature at MWVD stage during FDÂ +Â MWVD process resulted in lower reducing sugars and worse aroma retention, respectively. Faster drying rate in MWVD process induced worse cell structure.
⺠Apple slices dried by two combination drying methods and by freeze-drying were evaluated. ⺠Microwave application had a significant effect on total phenols, pectin and aroma. ⺠Faster drying rate in MWVD process induced worse cell structure. ⺠Longer time high temperature at desorption drying stage resulted in lower reducing sugars and worse aroma retention.
Journal: LWT - Food Science and Technology - Volume 47, Issue 1, June 2012, Pages 183-188