Acta Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(6), 1769-1777 | DOI: 10.11118/actaun201361061769

Modelling the moisture sorption isotherms of Roselle (Hibiscus sabdariffa L.) in the temperature range of 5-35 °C

Jitka Langová1, Donludee Jaisut2, Ratiya Thuwapanichayanan2, Charotorn Phowong2,3, Jiří Štencl3, Danijela Jovanovic1, Jiří Fryč3, Václav Vlášek1
1 Department of Milk Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences Brno, Palackého 1/3, 612 42 Brno, Czech Republic
2 Department of Farm Mechanics, Faculty of Agriculture, Kasetsart University, Thailand
3 Department of Agricultural, Food and Environmental Engineering, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

Water sorption tests of Roselle (Hibiscus sabdariffa L.) carried out under laboratory conditions are presented together with mathematical analyses of the moisture sorption isotherms (MSI's). Moisture equilibrium data for adsorption and desorption of water from Roselle powder were investigated at near ambient air temperatures in the range of 5 and 35 °C and water activity (Aw) ranging from 0.11 to 0.97. The manometric method has been used for water sorption tests. Models for MSI's are exponential equations. Coefficients of determination are 0.998 and 0.996 (for adsorption and desorption at 5 °C, respectively), 0.998 and 0.999 (for adsorption and desorption at 20 °C, respectively), and 0.998 and 0.999 (for adsorption and desorption at 35 °C, respectively). The equilibrium moisture content (EMC) of Roselle samples increased with an increase of Aw at a constant temperature both for adsorption and desorption. Adsorption curve equates to desorption curve at higher temperatures of tests carried out. Critical values of EMC of samples tested corresponding to the Aw equal to 0.6 were between 13.401% moisture content wet basis (MC w.b.) and 15.934% MC (w.b.) for moisture adsorption and desorption, respectively. These values are useful for storing conditions optimisation from point of view microorganisms grow and structural changes analyses. Crystal structure changes were observed during adsorption and desorption in the microscope, too. It was found out glass transition in dependence on the water content of samples tested.

Keywords: water activity, equilibrium moisture content, hysteresis, prediction, grow of microorganisms, glass transition
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This study was supported by projects IGA 16/2013/FVHE Ready-to-Eat Food Microorganism Monitoring with Preservative Use and Protective Packaging and IGA AF MENDELU 11/2013 Biomass and Bio-Energetic Transformations. The authors wish to thank the Kasetsart University Bangkok for the financial support.

Received: June 25, 2013; Published: November 24, 2013  Show citation

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Langová, J., Jaisut, D., Thuwapanichayanan, R., Phowong, C., Štencl, J., Jovanovic, D., Fryč, J., & Vlášek, V. (2013). Modelling the moisture sorption isotherms of Roselle (Hibiscus sabdariffa L.) in the temperature range of 5-35 °C. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(6), 1769-1777. doi: 10.11118/actaun201361061769
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