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Drying Kinetics and Mathematical Modelling of Raisin Production by Abrasive and Chemical Pre-Treatment of Grapes

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Title Drying Kinetics and Mathematical Modelling of Raisin Production by Abrasive and Chemical Pre-Treatment of Grapes
 
Creator Ananda, Pawar Dilip
Kumar, Giri Saroj
Kumar, Sharma Ajay
 
Subject Dried grapes
Food safety
Solar drying
Tray drying
Waxy layer
 
Description 350-361
One of the delicious dry fruit, raisin is obtained by drying of grapes with pre-drying treatment. Chemical pre-treatment is
most commonly followed for the raisin processing. However, it has drawback like extended drying time and it also triggers
the food safety concerns. Various alternatives are being explored for the production of safe raisins. In the present
investigation, drying kinetics of grapes and modelling of raisin production have been studied. Grapes were pre-treated with
conventional chemical method and novel abrasive method and compared. Treated grapes were dried in tray dryer and solar
dryer. Drying kinetics and modelling of experimental data was examined with ten empirical drying equations. Drying rate
was higher for grapes treated with abrasive method compared to chemical pre-treatment. Among the different drying
conditions, tray drying (55°C) and solar drying (temperature range 43.33 to 58.33°C) was found suitable for superior quality
raisin production with drying time of 56.66 h and 78.5 h, respectively. The browning index and firmness of raisins produced
using abrasive pre-treatment was to some extent higher compared to chemical treatment whereas yellowness index was
found slightly lesser in case of abrasive treated samples. The Modified Handerson-Pebis Model fitted best to predict the
drying of abrasive treated grapes, whereas Two term model reported highest goodness of fit for chemically treated grapes.
Effective diffusivity for moisture removal of grapes ranged between 1.03×10−9 to 5.52×10−10 m2/s and was maximum for
abrasive treated grapes. Present findings of drying behaviour of grapes and modelling will be useful for the better design of
drying systems for production of safe raisins using novel abrasive pre-treatment.
 
Date 2024-04-09T11:33:01Z
2024-04-09T11:33:01Z
2024-04
 
Type Article
 
Identifier 0022-4456 (Print); 0975-1084 (Online)
http://nopr.niscpr.res.in/handle/123456789/63733
https://doi.org/10.56042/jsir.v83i4.5882
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source JSIR Vol.83(4) [April 2024]