พชร นาเมืองรักษ์. Study of Microwave-Vacuum and Hot Air Drying of Jackfruit. Master's Degree(Food Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Study of Microwave-Vacuum and Hot Air Drying of Jackfruit
Abstract:
Jackfruit chip is one of the most popular snack foods produced by vacuum frying
method. However, since the fried chip contains high oil content, drying is considered as
an alternative method for producing jackfruit chip without oil. The objective of this
research was to study the effects of drying methods (i.e., microwave-vacuum and
conventional hot air drying) and process conditions (i.e., air temperature, microwave
power and vacuum pressure) on the drying kinetics and quality of jackfruit chip. Based
on the experimental results, it was found that microwave-vacuum drying (MVD)
required shorter drying time due to its higher drying rates as compared with those of
conventional hot air drying (HAD). In terms of quality, i.e., color, shrinkage,
rehydration ratio, hardness and crispness of dried jackfruits, MVD products had higher
quality than HAD products. Based on the SEM results, it was observed that drying at
higher microwave powers led to products with larger and more pores. Furthermore, it
was found that Page's model could explain the drying behavior of the samples
undergoing MVD methods at all studied conditions (R2 = 0.990-0.999).