Water vapor adsorption characteristics of starch−albumen powder and rheological behavior of its paste

This paper concerns the water vapor adsorption properties of starch-albumen powder (SAP), as a new product with many potential food processing applications. The adsorption data were generated at some practical storage temperatures (27, 35 and 40°C) and water activities, aw (0.11–0.86) using gravimet...

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Bibliographic Details
Published in:Nigerian food journal 2015-06, Vol.33 (1), p.90-96
Main Authors: Shittu, T.A., Idowu-Adebayo, F., Adedokun, I.I., Alade, O.
Format: Article
Language:English
Subjects:
Starch-albumen powder
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Summary:This paper concerns the water vapor adsorption properties of starch-albumen powder (SAP), as a new product with many potential food processing applications. The adsorption data were generated at some practical storage temperatures (27, 35 and 40°C) and water activities, aw (0.11–0.86) using gravimetric method. The data were fitted to some isotherm models (GAB, Peleg, DLP and BET). The values of some thermodynamic parameters based on the Clausius–Clapeyron equation were also calculated. The rheological behavior of SAP paste was also studied at 20, 30, 45 and 60°C. SAP was found to have type II isotherm shape and is highly hygroscopic. The adsorption data were better fitted by Peleg and DLP models (r2=0.987–0.999). Monolayer moisture capacity ranged between 4.9 and 6.8g/100g solid. The water vapor sorption process in SAP is thermodynamically non-spontaneous and enthalpy-driven. SAP paste showed a characteristic shear-thinning behavior. Activation energy of flow (Ea) was found to be 31.63kJ/mol.
ISSN:0189-7241
DOI:10.1016/j.nifoj.2015.04.014