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Food and Bioprocess Technology

, Volume 4, Issue 4, pp 610–615 | Cite as

Dehydration of Malay Apple (Syzygium malaccense L.) Using Ultrasound as Pre-treatment

  • Francisca I. P. Oliveira
  • Maria I. Gallão
  • Sueli Rodrigues
  • Fabiano André Narciso Fernandes
Communication

Abstract

This work examined the influence of the ultrasonic pre-treatment prior to air drying on dehydration of jambo (Syzygium malaccense L.) also known as Malay apple. This study allowed the estimation of water loss and sugar gain during the pre-treatment and the effective water diffusivity in the air-drying process for jambo subjected to ultrasonic pre-treatment. Results showed that during the ultrasonic treatment, in distilled water, the Malay apples lost sugar, so such a pre-treatment stage can be a practical process to produce dried fruits with lower sugar content. The water effective diffusivity increased by 28.1% (best result) after application of ultrasound, which caused a reduction of about 27.3% in the total drying time.

Keywords

Syzygium malaccense L. Jambo Drying Ultrasound Optimization 

Notation

D

Effective diffusivity (m2/min)

H

Moisture content of the fruit (gwater/gdry solids)

Heq

Equilibrium moisture content of the fruit (gwater/gdry solids)

t

Time (h)

WL

Water loss (%)

SG

Solid gain (%)

Xi

Initial fruit moisture on wet basis (gwater/g)

Xf

Final fruit moisture on wet basis (gwater/g)

wi

Initial fruit mass (g)

wf

Final fruit mass (g)

δ

Bed height of the fruit (m)

Notes

Acknowledgments

The authors thank the Brazilian funding institutes CAPES and CNPq.

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Copyright information

© Springer Science + Business Media, LLC 2010

Authors and Affiliations

  • Francisca I. P. Oliveira
    • 1
  • Maria I. Gallão
    • 2
  • Sueli Rodrigues
    • 3
  • Fabiano André Narciso Fernandes
    • 1
  1. 1.Departamento de Engenharia QuimicaUniversidade Federal do CearaFortalezaBrazil
  2. 2.Departamento de BiologiaUniversidade Federal do CearaFortalezaBrazil
  3. 3.Departamento de Tecnologia dos AlimentosUniversidade Federal do CearaFortalezaBrazil

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