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Low humidity air drying of apple slices: Effect of EMR pretreatment on mass transfer parameters, energy efficiency and quality.
Sandhya, R. Shewale and Deependra, Rajoriya and Umesh Hebbar, H. (2019) Low humidity air drying of apple slices: Effect of EMR pretreatment on mass transfer parameters, energy efficiency and quality. Innovative Food Science and Emerging Technologies, 55. pp. 1-10.
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Innovative Food Science and Emerging Technologies 55 (2019) 1–10.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy |
Abstract
The apple slices were treated with electromagnetic radiations (EMR) namely, infrared (IR) and microwave (MW) and dried using low humidity air (LHA) and normal hot air (HA) at 40 °C. The effect of EMR pretreatment on drying kinetics, mass transfer, shrinkage, porosity, energy efficiency and product quality was evaluated. The combination of EMR pretreatment with LHA drying reduced the drying time by 23.4 to 27.3%, and the dried product had lower shrinkage (60 to 65%) as well as higher porosity (0.38 to 0.45) compared to control. Among the EMR pretreatments, IR treated slices retained a higher amount of ascorbic acid (78.68%), phenolic content (74.42%), antioxidant activity (79.54%) and better color compared to MW treated. EMR pretreatment reduced the energy requirement for drying by 26.5 to 37.1%. The mass transfer parameters (moisture diffusivity and mass transfer coefficient) estimated using the analytical model proposed by Dincer and Dost showed higher values for EMR treated samples. Moisture content predicted for both the drying methods showed good agreement with experimental values. The present study demonstrated that for heat sensitive products like apple, a combination of IR pretreatment and LHA drying could be effective for reducing drying time as well as energy requirements and also to obtain better quality products.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Low humidity air drying Electromagnetic radiation Energy efficiency Mass transfer |
| Subjects: | 600 Technology > 08 Food technology > 24 Fruits > 01 Apple 600 Technology > 08 Food technology > 06 Preservation and Storage > 02 Drying and Dehydration |
| Divisions: | Food Engineering |
| Depositing User: | Food Sci. & Technol. Information Services |
| Date Deposited: | 25 Nov 2020 05:33 |
| Last Modified: | 25 Nov 2020 05:33 |
| URI: | http://ir.cftri.res.in/id/eprint/14626 |
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