Microwave drying of foods with high humidity

Abstract

A test unit of a microwave dryer was constructed and tested for cooking and drying foods with high humidity. The test identified the moisture evaporation curve and the drying curve. Based on these curves, a four‐stage drying process was introduced. A local taro, Bin‐lang‐Yu, was put through the unit, and the measurements show the feasibility of microwave drying of foods with high humidity. Significant efficiency improvements with microwave drying were obtained. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 205–207, 1999.

ENERGY REQUIREMENT AND QUALITY ASPECTS OF CHINESE JUJUBE (ZIZYPHUS JUJUBA MILLER) IN HOT AIR DRYING FOLLOWED BY MICROWAVE DRYING

“…In addition, applying microwave drying in the last stage of the dehydration process can be very efficient in removing bound water from the product (Litvin et al. 1998; Cheng et al. 1999; Maskan 2000a).…”

“…The longer the hot air drying time was, the more the "case hardening." In addition, applying microwave drying in the last stage of the dehydration process can be very efficient in removing bound water from the product (Litvin et al 1998;Cheng et al 1999;Maskan 2000a). With conventional heating, it is necessary to expose the product to a high temperature to break the bonds that keep the water absorbed in the material.…”

“…1996; Funebo and Ohlsson 1998; Litvin et al. 1998; Ren and Chen 1998; Cheng et al. 1999; Drouzas et al.…”

“…Nonenzymatic browning, poor rehydration characteristics and loss of nutrients are the other common problems of convective drying. Compared with air drying alone, the combination of microwave drying and hot air drying can not only increase drying rate, but also improve the quality of the dried product (Khraisheh et al 1995;Torringa et al 1996;Funebo and Ohlsson 1998;Litvin et al 1998;Ren and Chen 1998;Cheng et al 1999;Drouzas et al 1999;Funebo et al 2000;Maskan 2000a). However, combined drying of Chinese jujube was not reported in the literature.…”

Microwave Drying of Granules Containing a Moisture-Sensitive Drug: A Promising Alternative to Fluid Bed and Hot Air Oven Drying

“…10,14) A typical formulation usually consists of several excipients other than the drug. Thus, product quality could be affected by the excipients, especially if excessive heat was generated.…”