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- Title
Nano Zinc Oxide-Loaded Calcium Alginate Films with Potential Antibacterial Properties.
- Authors
Bajpai, Sunil; Chand, Navin; Chaurasia, Varsha
- 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 m 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. Finally, the biocidal action of films was tested against model bacteria Escherichia coli.
- Subjects
ZINC oxide films; CALCIUM alginate; ANTIBACTERIAL agents; NANOPARTICLES; TEMPERATURE effect; WATER activity of food; ESCHERICHIA coli
- Publication
Food & Bioprocess Technology, 2012, Vol 5, Issue 5, p1871
- ISSN
1935-5130
- Publication type
Article
- DOI
10.1007/s11947-011-0587-6