Heat and Mass Transfer

, Volume 55, Issue 8, pp 2153–2163 | Cite as

Investigation of ultrasound-assisted convective drying process on quality characteristics and drying kinetics of zucchini slices

  • Niloufar Bagheri
  • Somayeh Taghian DinaniEmail author


In the present investigation, the ultrasound-assisted convective drying process for zucchini slices was studied. In this regard, the effects of convective air velocity (in three levels of 1, 2, and 3 m/s) and ultrasonic pretreatment time (in three levels of 0, 15, and 30 min) on drying kinetic, drying time, and qualitative characteristics of the dried product were investigated. Moreover, the effects of these independent variables on functional groups of dried zucchini slices were also studied using Fourier Transform Infrared spectroscopy (FTIR), and those on the microscopic structure of dried zucchini slices were investigated using Scanning Electron Microscopy (SEM). Based on the results obtained in this study, the ultrasonic pretreatment for 30 min and convective air velocity of 2 m/s are recommended for drying zucchini slices with optimal product quality and short drying time. Compared to untreated samples, less wrinkled tissues and more microscopic channels were observed in pretreated samples especially at 30 min sonication time. In terms of functional groups, there was no difference in the FTIR spectra at different levels of ultrasonic pretreatment time and convective air velocity.


Ultrasonic pretreatment time Air velocity Quality attributes FTIR SEM 



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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Food Science, Shahreza BranchIslamic Azad UniversityShahrezaIran

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