# Effect of ohmic pretreatment on the drying rate of grapes and adsorption isotherm of raisins
> Salengke S.

URL kanonis: https://discover.unhas.ac.id/publications/effect-of-ohmic-pretreatment-on-the-drying-rate-of-grapes-and-adsorption-isother
Jurnal / Konferensi: Drying Technology
Tahun terbit: 2005
DOI: https://doi.org/10.1081/DRT-200054131
ISSN: 07373937
Kuartil SJR: Q2
Citations: 44

## Authors
- Salengke S.

## Abstract
Abstract Effects of ohmic pretreatment on the drying rates of seedless red grapes and adsorption isotherms of the raisins produced were investigated. The treated grape samples were heated in a medium containing 2% citric acid to a final medium temperature of 60oC using an alternating current at 14 V/cm field strength and 30 Hz, 60 Hz, and 7.5 kHz frequencies. Results of this study reveal that the drying rate of the grapes was significantly increased by the ohmic pretreatment, especially at low electrical frequencies. The effect of the ohmic pretreatment on equilibrium moisture content of the raisins produced was evident at 0.75 or higher water activities but there was no or limited effect at low to moderate water activities.

## Keywords
- Citric acid
- Ohmic contact
- Adsorption
- Chemistry
- Sorption isotherm
- Moisture
- Water activity
- Water content
- Joule heating
- Materials science
- Analytical Chemistry (journal)
- Food science
- Chromatography
- Composite material
- Geotechnical engineering
- Layer (electronics)
- Engineering
- Organic chemistry

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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