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Title

GRAPE DRYING

Pages

  66-70

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Abstract

 In this paper, drying Iranian seedless white grape (sultana) was considered using a laboratory batch dryer. The effects of pretreatment and temperature on the drying rate of grape at constant air velocity were studied. Pretreatment solutions containing different alkaline materials with different concentrations and temperatures were considered. Dipping grape into an alkaline solution increases the drying rate ubstantially. Increasing the air temperature of the dryer from 60°C to 70°C accelerated the drying rate (drying time decrease) of the pretreated grape. Depending on the pretreatment and air temperature conditions. the drying process took about 450 to 900 minutes. The shortest drying time and the best quality dried product were obtained with grapes dipped in a solution of potassium carbonate 5% at 42°c. The mean apparent diffusivity of moisture for K2Co3 pretreatment was calculated at 50, 60 and 70°C, and the values were fitted into an Arrhenius type model. Moisture sorption isotherms of currant were determined at 20, 30 and 40°C using static gravimetric methods. The modified Halsey equation was used to predict experimental data for a water activity range of 0.1 - 0.85.

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    APA: Copy

    PAHLAVANZADEH, H., BASIRI, A., & ZARABI, M.M.. (2002). GRAPE DRYING. SCIENTIA IRANICA, 9(1 (CHEMICAL ENGINEERING)), 66-70. SID. https://sid.ir/paper/289475/en

    Vancouver: Copy

    PAHLAVANZADEH H., BASIRI A., ZARABI M.M.. GRAPE DRYING. SCIENTIA IRANICA[Internet]. 2002;9(1 (CHEMICAL ENGINEERING)):66-70. Available from: https://sid.ir/paper/289475/en

    IEEE: Copy

    H. PAHLAVANZADEH, A. BASIRI, and M.M. ZARABI, “GRAPE DRYING,” SCIENTIA IRANICA, vol. 9, no. 1 (CHEMICAL ENGINEERING), pp. 66–70, 2002, [Online]. Available: https://sid.ir/paper/289475/en

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