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The influence of temperature on rehydration and sorption properties of freeze-dried strawberries

Agnieszka Ciurzyńska ; Warsaw University of Life Sciences, Faculty of Food Sciences, Warszawa, Poland
A. Lenart ; Warsaw University of Life Sciences, Faculty of Food Sciences, Warszawa, Poland


Puni tekst: engleski pdf 162 Kb

str. 15-23

preuzimanja: 2.111

citiraj


Sažetak

The aim of this work was to investigate the influence of heating shelf temperature on selected physical properties of freeze-dried strawberries. Frozen strawberries were freeze-dried at heating shelf temperature of 10, 30, 50 and 70°C for 24 hours.
Rehydration, adsorption rate and sorption isotherms were determined for freeze-dried strawberries. With increase the temperature of heating shelves in the range 10-50°C, rehydration capacity was increased. After 30 minutes of the rehydration process there was a decrease in water content, which is probably connected with changes in structure. Sorption isotherms were included to II isotherms type and have a sigmoidal shape characteristic for most food products. For the mathematical description Peleg’s model was used. For freeze-dried strawberries obtained in the range from 10 to 50°C isotherms have the same courses. Increase of temperature to 70°C resulted in obtaining the lowest water content in the water activity range from 0.113 to 0.648. There is a statistically significant influence of temperature of heating shelf on water vapour sorption for freeze-dried strawberries. For fruit freeze-dried in 30°C there was the highest water vapour sorption rate.

Ključne riječi

strawberries; freeze-drying; water sorption; kinetic; rehydration

Hrčak ID:

53240

URI

https://hrcak.srce.hr/53240

Datum izdavanja:

8.7.2009.

Posjeta: 2.665 *