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Drying Technology
An International Journal
Volume 26, 2008 - Issue 10
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Original Articles

A Comparative Study on the Effect of Chemical, Microwave, and Pulsed Electric Pretreatments on Convective Drying and Quality of Raisins

S. R. S. Dev Department of Bioresource Engineering, Macdonald Campus of McGill University, Ste Anne de Bellevue, Quebec, Canada
,
T. Padmini Department of Bioresource Engineering, Macdonald Campus of McGill University, Ste Anne de Bellevue, Quebec, Canada
,
A. Adedeji Department of Bioresource Engineering, Macdonald Campus of McGill University, Ste Anne de Bellevue, Quebec, Canada
,
Y. Gariépy Department of Bioresource Engineering, Macdonald Campus of McGill University, Ste Anne de Bellevue, Quebec, Canada
&
G. S. V. Raghavan Department of Bioresource Engineering, Macdonald Campus of McGill University, Ste Anne de Bellevue, Quebec, CanadaCorrespondence[email protected]
Pages 1238-1243 | Published online: 11 Sep 2008
 
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Abstract

In order to discourage the use of chemicals in raisin processing, the effect of microwave and pulsed electric field (PEF) pretreatments on the drying rate and other quality parameters like color, total soluble solids, bulk density, appearance, and market quality were compared with that of chemically pretreated raisins dried at 65°C. The untreated and pretreated samples had a statistically significant difference in drying rate (P < 0.05). The drying rate of chemically pretreated raisins was the highest when compared to others. The results showed that the PEF and microwave-treated samples had a significantly high Total Soluble Solids (TSS), along with good appearance and market quality.

ACKNOWLEDGEMENTS

The financial support of the Canadian International Development Agency and the Natural Sciences and Engineering Research Council is acknowledged.

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