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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5699

Title: Quality optimisation of combined osmotic dehydration and microwave assisted air drying of pineapple using constant power emission
Authors: Botha, GE
Oliveira, JC
Ahrné, L
Keywords: Combined technologies
Drying rate
Microwave drying
Osmotic dehydration
Overheating
Microwave energy
Pineapples
Constant power emission
Issue Date: Apr-2012
Publisher: Elsevier
Citation: Botha, GE, Oliviera, JC and Ahrne, L. 2012. Quality optimisation of combined osmotic dehydration and microwave assisted air drying of pineapple using constant power emission. Food and Bioproducts Processing, vol. 90(2), pp 171-179
Series/Report no.: Workflow;4348
Abstract: Combination of osmotic dehydration with microwave assisted air drying offers increased flexibility for process control and product quality. Osmotic dehydration (55ºBrix solution at 40ºC for 90 minutes) combined with microwave assisted air drying (MWAD) was tested on smooth cayenne pineapples. The influence of the four most relevant processing parameters (osmotic treatment time, microwave power, air temperature and air velocity) was studied using a 24 circumscribed central composite experimental design. The product quality was evaluated in terms of charred appearance at the surface, moisture content, soluble solids content, water activity, firmness, colour and volume. Microwave power and air temperature were the two most important processing parameters that influenced the quality of the dehydrated pineapple, with the parameters most affected by the operating conditions being water content and percentage of charred pieces. Only in the latter was a significant quadratic effect found, all others were approximately linear. There was also a significant interactive effect between microwave power and air temperature affecting the percentage of charred pieces. Model predictions using a quadratic surface for water content and % charred pieces were validated with an additional experiment. Quadratic models were used to indicate optimum drying conditions for various targets.
Description: Copyright: Published by Elsevier B.V. on behalf of The Institution of Chemical Engineers. This is the post-print version of the work. The definitive version is published in Food and Bioproducts Processing, vol. 90(2), pp 171-179
URI: http://www.sciencedirect.com/science/article/pii/S0960308511000137
http://hdl.handle.net/10204/5699
ISSN: 0960-3085
Appears in Collections:General science, engineering & technology
Agroprocessing and chemical technology

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