Effect of pretreatments on drying characteristics of Thompson seedless grapes

DOI: 10.18805/ajdfr.DR-1261    | Article Id: DR-1261 | Page : 332-336
Citation :- Effect of pretreatments on drying characteristics of Thompson seedless grapes.Asian Journal Of Dairy and Food Research.2017.(36):332-336
S.D. Pawar, V.V. Lomte and B.K. Sakhale bksakhale@gmail.com
Address : Department of Chemical Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad-431 004, Maharashtra, India.
Submitted Date : 29-05-2017
Accepted Date : 13-09-2017

Abstract

The effect of various pretreatments on drying characteristics of Thompson seedless grapes were studied using a laboratory scale cabinet tray dryer with the controlled condition at air temperature 500C and at air velocity of 1.2 m/s. In various pretreatments, lye treatment and potassium metabisulphite (KMS) were used with commercial dipping oil and citric acid. Variable thermal diffusivity was calculated from experimentally estimated values of thermo-physical properties at a given moisture contents. Studies of transport properties for all pretreatments were also conducted. These parameters were correlated with the corresponding moisture content in an empirical model using a non-linear regression method. Treatments with Citric acid found to be effective, thermal diffusivity significantly decreased with a decrease in the moisture content of the grapes. The pre-drying treatments had no significant effect on the thermo-physical properties of grapes.

Keywords

Drying kinetics Grape Pretreatment solution Thermal diffusivity

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