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

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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.

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Abbreviations

D :

Effective diffusivity (m2/min)

H :

Moisture content of the fruit (gwater/gdry solids)

H eq :

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

t :

Time (h)

WL:

Water loss (%)

SG:

Solid gain (%)

X i :

Initial fruit moisture on wet basis (gwater/g)

X f :

Final fruit moisture on wet basis (gwater/g)

w i :

Initial fruit mass (g)

w f :

Final fruit mass (g)

δ :

Bed height of the fruit (m)

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Acknowledgments

The authors thank the Brazilian funding institutes CAPES and CNPq.

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Authors and Affiliations

  1. Departamento de Engenharia Quimica, Universidade Federal do Ceara, Campus do Pici, Bloco 709, 60455-760, Fortaleza, CE, Brazil

    Francisca I. P. Oliveira & Fabiano André Narciso Fernandes

  2. Departamento de Biologia, Universidade Federal do Ceara, Campus do Pici, Bloco 858, 60455-760, Fortaleza, CE, Brazil

    Maria I. Gallão

  3. Departamento de Tecnologia dos Alimentos, Universidade Federal do Ceara, Campus do Pici, Bloco 858, 60455-760, Fortaleza, CE, Brazil

    Sueli Rodrigues

Authors
  1. Francisca I. P. Oliveira
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  2. Maria I. Gallão
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  3. Sueli Rodrigues
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  4. Fabiano André Narciso Fernandes
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Correspondence to Fabiano André Narciso Fernandes.

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Oliveira, F.I.P., Gallão, M.I., Rodrigues, S. et al. Dehydration of Malay Apple (Syzygium malaccense L.) Using Ultrasound as Pre-treatment. Food Bioprocess Technol 4, 610–615 (2011). https://doi.org/10.1007/s11947-010-0351-3

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