Determination of drying and rehydration characteristics of eggplant slices


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DOYMAZ İ. , Aktaş C.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.33, no.3, pp.833-841, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 3
  • Publication Date: 2018
  • Doi Number: 10.17341/gazimmfd.416386
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.833-841
  • Keywords: Activation energy, effective moisture diffusivity, eggplant, drying, rehydration, AIR TEMPERATURES, THIN-LAYERS, KINETICS, DRYER, PRETREATMENTS, SHRINKAGE, SELECTION

Abstract

In this study, drying characteristics of eggplant slices were investigated by using cabinet dryer. The eggplant slices were pretreated with citric acid solution and blanching in the hot water before drying process. Then, the pretreated and untreated samples were dried in the hot air dryer at 40, 50, 60 and 70 degrees C temperatures. The results showed that the increase in air temperature and pretreatment reduced the drying time and increased rehydration capacity. Moreover, it was observed that the drying temperature and pretreatment affected the colour values. Effective diffusion coefficient values ranged from 2,28X10(-10) to 9,52X10(-10 )m(2)/s, and increased with the increase in air temperature. The values of activation energy were calculated as 26,1432,69 kJ/mol.