Abstract
In this work, zinc oxide nanoparticles-loaded calcium alginate films were investigated for their moisture uptake behavior at different temperatures. The equilibrium uptake data was interpreted quantitatively by GAB isotherm models. The monolayer moisture contents were 0.301 ± 0.003, 0.0214 ± 0.092, and 0.171 ± 0.102 at 20, 30, and 37°C, respectively. The water vapor transmission rate was found to be 0.816 ± 0.143, 1.42 ± 0.045, and 1.632 ± 0.064 g s−1 m−2 respectively. For the moisture content range of 0.2 to 0.6, the net ∆H and ∆S values were found to be 22.73 to 11.14 KJ/mol and 0.064 to 0.034 KJ/mol/K, respectively. The moisture uptake of films increased with water activity but showed negative temperature dependence. The enthalpy of sorption (∆H) and differential entropy (∆S) were determined at different moisture content values, ranging from 0.2 to 0.6 g/g db. The two parameters showed a higher degree of correlation. The equilibrium moisture content data was used to evaluate harmonic mean temperature T hm. Finally, the biocidal action of films was tested against model bacteria Escherichia coli.
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Acknowledgment
We thank Dr. O. P. Sharma, Prof. and Head of the Department of the Chemistry, at Govt. Model Science College, Jabalpur, India, to provide experimental facilities. We are also thankful to Dr. Rajshree Kapoor, Head of the Department of English, for proof reading and making appropriate corrections throughout the manuscript.
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Bajpai, S.K., Chand, N. & Chaurasia, V. Nano Zinc Oxide-Loaded Calcium Alginate Films with Potential Antibacterial Properties. Food Bioprocess Technol 5, 1871–1881 (2012). https://doi.org/10.1007/s11947-011-0587-6
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DOI: https://doi.org/10.1007/s11947-011-0587-6