Moisture Adsorption Studies on Soy - Mumu Supplemented with Moringa Leaf Powder
Advances in Bioscience and Bioengineering
Volume 4, Issue 6, December 2016, Pages: 67-73
Received: Sep. 27, 2016; Accepted: Nov. 1, 2016; Published: Nov. 23, 2016
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Authors
Igbabul Bibiana Dooshima, Department of Food Science and Technology, University of Agriculture, Makurdi, Nigeria
Shar Faustina Mbanengen, Department of Food Science and Technology, University of Agriculture, Makurdi, Nigeria
Ikya Julius, Department of Food Science and Technology, University of Agriculture, Makurdi, Nigeria
Amove Julius, Department of Food Science and Technology, University of Agriculture, Makurdi, Nigeria
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Abstract
Moisture adsorption Studies was carried out on Soy-mumu, a Nigerian cereal-based food product supplemented with 0, 10, 15 and 20% Moringa leaf powder at four different temperatures(20°C, 30°C, 40°C and 50°C) using the standard static gravimetric method. The different blends of Soy-mumu products were subjected to water activities of 0.1 – 0.957 for each of the four temperatures (20°C, 30°C, 40°C and 50°C) and data obtained were analysed using Oswin, Henderson and GAB models while thermodynamics of moisture transfer were estimated using Clausius-Clapeyron and kinetic compensation equations. The moisture adsorption isotherms were sigmoid in shape (type II). The equilibrium moisture content (EMC) of the Soy-mumu products increased with increase in water activity at constant temperature and were lower as the temperature increased at constant water activity. The sorptive capacity of Soy-mumu products increased with increasing levels of Moringa leaf powder supplementation and exhibited higher isotherms. Using the percent root mean square of error (% RMS), Oswin model gave the best fit for describing the adsorption isotherms of the Soy-mumu products while GAB and Henderson models fitted poorly (<10% RMS). Monolayer moisture content (Mo) and surface area (So) of adsorption decreased with increase in temperature. The GAB monolayer moisture contents were higher than BET monolayer moisture contents. The isosteric heat of sorption generally decreased as the moisture content increased. The maximum isosteric heat (ΔHst) was 14.1928; 14.19288; 37.0272 and 57.9120kj/mol for samples that were supplemented with 0, 10, 15 and 20% Moringa leaf powder respectively. The enthalpy-entropy compensation theory is suitable for describing the moisture adsorption phenomenon of the Soy-Mumu products.
Keywords
Soy-Mumu, Moisture Adsorption, Moringa Leaf Powder
To cite this article
Igbabul Bibiana Dooshima, Shar Faustina Mbanengen, Ikya Julius, Amove Julius, Moisture Adsorption Studies on Soy - Mumu Supplemented with Moringa Leaf Powder, Advances in Bioscience and Bioengineering. Vol. 4, No. 6, 2016, pp. 67-73. doi: 10.11648/j.abb.20160406.11
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Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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