American Journal of Food Science and Technology
ISSN (Print): 2333-4827 ISSN (Online): 2333-4835 Website: Editor-in-chief: Hyo Choi
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American Journal of Food Science and Technology. 2018, 6(6), 274-279
DOI: 10.12691/ajfst-6-6-7
Open AccessArticle

Moisture Sorption Characteristics of Selected Commercial Flours (Wheat, Rice and Corn) of Bangladesh

M.W. Ahmed1, and M.N. Islam2

1Department Agricultural Engineering, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

2Departmentof Food Technology and Rural Industries, Bangladesh Agricultural University, Mymensingh, Bangladesh

Pub. Date: December 04, 2018

Cite this paper:
M.W. Ahmed and M.N. Islam. Moisture Sorption Characteristics of Selected Commercial Flours (Wheat, Rice and Corn) of Bangladesh. American Journal of Food Science and Technology. 2018; 6(6):274-279. doi: 10.12691/ajfst-6-6-7


Moisture sorption isotherms of commercial wheat flour, rice flour and corn flour were determined within the water activity range of 0.11-0.93 at different temperatures (5°C, 30°C and 55°C) using the static gravimetric method. The moisture sorption isotherm of all flours exhibited type II characteristics according to BET classification. It was found that corn flour had a higher sorption capacity than wheat and rice flour. Temperature influence on sorption behavior was found that, for wheat and corn flour, the sorption capacity decreased with the increase of temperature, while for the rice flour an opposite behavior was observed at water activity value higher than 0.75. The Clausius–Clapeyron equation was used to calculate the net isosteric heat of sorptions. For all flours, the heat of sorption decreased with the increase of EMC.

sorption isotherms wheat flour rice flour corn flour water activity

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