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Adsorption isotherms and thermodynamics properties of water yam flour

Adsorption isotherms and thermodynamics properties of water yam flour

Owo, H. O., Adebowale, A. A., Sobukola, O. P., Obadina, A. O., Kajihausa, O. E., Adegunwa, M. O., Sanni, L. O. and Tomlins, K. (2016) Adsorption isotherms and thermodynamics properties of water yam flour. Quality Assurance and Safety of Crops and Foods, 9 (2). pp. 221-227. ISSN 1757-8361 (Print), 1757-837X (Online) (doi:https://doi.org/10.3920/QAS2015.0655)

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Abstract

Adsorption isotherms of water yam flour were determined by static gravimetric method of saturated salt solutions in the range of water activities between 0.11 and 0.96 and at temperatures of 25, 35 and 45 °C. The experimental sorption data was fitted to five models: Guggenheim-Anderson-De Boer (GAB), Peleg, Iglesias-Chirife, Exponential and Oswin and the differential enthalpy and entropies were determined. Equilibrium moisture contents decreased with increase in temperature at all the water activities studied. Peleg model gave the best fit for the sorption isotherm of water yam flour. Monolayer moisture content values estimated from the GAB-model were found to decrease with increases in temperature. The differential enthalpy and entropy decreased with increases in moisture content. The isokinetic temperature was 371.32 K and the compensation theory was satisfied.

Item Type: Article
Uncontrolled Keywords: Water yam flour; Water activity; Differential enthalpy; Differential entropy; Compensation theory
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Faculty of Engineering & Science > Natural Resources Institute > Food Systems Research Group
Last Modified: 25 Oct 2017 13:50
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/17814

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