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BACKGROUNDTo overcome the flaws of high energy consumption of freeze drying (FD) and the non‐uniform drying of microwave freeze drying (MFD), pulse‐spouted microwave vacuum drying (PSMVD) was developed.
RESULTSThe results showed that the drying time can be dramatically shortened if microwave was used as the heating source. In this experiment, both MFD and PSMVD could shorten drying time by 50% as compared to the FD process. Depending on the heating method, MFD and PSMVD dried banana cubes showed trends of expansion while FD dried samples demonstrated trends of shrinkage. Shrinkage also brought intensive structure and highest fracturability of all three samples dried by different methods. The residual ascorbic acid content of PSMVD dried samples can be as high as in FD dried samples, which were superior to MFD dried samples...
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